WebSocket API for notifications; refactoring

application/src/main/java/org/thingsboard/server/controller/AbstractRpcController.java

@@ -43,7 +43,7 @@ import org.thingsboard.server.service.rpc.TbCoreDeviceRpcService;
 import org.thingsboard.server.service.security.AccessValidator;
 import org.thingsboard.server.service.security.model.SecurityUser;
 import org.thingsboard.server.service.security.permission.Operation;
-import org.thingsboard.server.service.telemetry.exception.ToErrorResponseEntity;
+import org.thingsboard.server.exception.ToErrorResponseEntity;
 
 import javax.annotation.Nullable;
 import java.util.Optional;

application/src/main/java/org/thingsboard/server/controller/NotificationController.java

@@ -19,6 +19,7 @@ import lombok.RequiredArgsConstructor;
 import lombok.extern.slf4j.Slf4j;
 import org.springframework.security.access.prepost.PreAuthorize;
 import org.springframework.security.core.annotation.AuthenticationPrincipal;
+import org.springframework.web.bind.annotation.DeleteMapping;
 import org.springframework.web.bind.annotation.GetMapping;
 import org.springframework.web.bind.annotation.PathVariable;
 import org.springframework.web.bind.annotation.PostMapping;
@@ -29,6 +30,7 @@ import org.springframework.web.bind.annotation.RequestParam;
 import org.springframework.web.bind.annotation.RestController;
 import org.thingsboard.server.common.data.exception.ThingsboardException;
 import org.thingsboard.server.common.data.id.NotificationId;
+import org.thingsboard.server.common.data.id.NotificationRequestId;
 import org.thingsboard.server.common.data.notification.Notification;
 import org.thingsboard.server.common.data.notification.NotificationRequest;
 import org.thingsboard.server.common.data.notification.NotificationStatus;
@@ -71,7 +73,7 @@ public class NotificationController extends BaseController {
     public void markNotificationAsRead(@PathVariable UUID id,
                                        @AuthenticationPrincipal SecurityUser user) {
         NotificationId notificationId = new NotificationId(id);
-        notificationService.updateNotificationStatus(user.getTenantId(), notificationId, NotificationStatus.READ);
+        notificationProcessingService.markNotificationAsRead(user, notificationId);
     }
 
 
@@ -83,6 +85,14 @@ public class NotificationController extends BaseController {
         return notificationProcessingService.processNotificationRequest(user, notificationRequest);
     }
 
+    @GetMapping("/notification/request/{id}")
+    @PreAuthorize("hasAnyAuthority('SYS_ADMIN', 'TENANT_ADMIN')")
+    public NotificationRequest getNotificationRequestById(@PathVariable UUID id,
+                                                          @AuthenticationPrincipal SecurityUser user) {
+        NotificationRequestId notificationRequestId = new NotificationRequestId(id);
+        return notificationService.findNotificationRequestById(user.getTenantId(), notificationRequestId);
+    }
+
     @GetMapping("/notification/requests")
     @PreAuthorize("hasAnyAuthority('SYS_ADMIN', 'TENANT_ADMIN')")
     public PageData<NotificationRequest> getNotificationRequests(@RequestParam int pageSize,
@@ -96,9 +106,11 @@ public class NotificationController extends BaseController {
         return notificationService.findNotificationRequestsByTenantIdAndPageLink(user.getTenantId(), pageLink);
     }
 
-    // delete request and sent notifications
-    public void deleteNotificationRequest() {
-
+    @DeleteMapping("/notification/request/{id}")
+    public void deleteNotificationRequest(@PathVariable UUID id,
+                                          @AuthenticationPrincipal SecurityUser user) {
+        NotificationRequestId notificationRequestId = new NotificationRequestId(id);
+        notificationProcessingService.deleteNotificationRequest(user, notificationRequestId);
     }
 
 }

application/src/main/java/org/thingsboard/server/controller/RpcV2Controller.java

@@ -47,7 +47,7 @@ import org.thingsboard.server.common.msg.TbMsgMetaData;
 import org.thingsboard.server.queue.util.TbCoreComponent;
 import org.thingsboard.server.service.rpc.RemoveRpcActorMsg;
 import org.thingsboard.server.service.security.permission.Operation;
-import org.thingsboard.server.service.telemetry.exception.ToErrorResponseEntity;
+import org.thingsboard.server.exception.ToErrorResponseEntity;
 
 import javax.annotation.Nullable;
 import java.util.UUID;

application/src/main/java/org/thingsboard/server/controller/TelemetryController.java

@@ -84,8 +84,8 @@ import org.thingsboard.server.service.security.model.SecurityUser;
 import org.thingsboard.server.service.security.permission.Operation;
 import org.thingsboard.server.service.telemetry.AttributeData;
 import org.thingsboard.server.service.telemetry.TsData;
-import org.thingsboard.server.service.telemetry.exception.InvalidParametersException;
-import org.thingsboard.server.service.telemetry.exception.UncheckedApiException;
+import org.thingsboard.server.exception.InvalidParametersException;
+import org.thingsboard.server.exception.UncheckedApiException;
 
 import javax.annotation.Nullable;
 import javax.annotation.PostConstruct;

application/src/main/java/org/thingsboard/server/controller/plugin/TbWebSocketHandler.java

@@ -38,10 +38,11 @@ import org.thingsboard.server.dao.tenant.TbTenantProfileCache;
 import org.thingsboard.server.queue.util.TbCoreComponent;
 import org.thingsboard.server.service.security.model.SecurityUser;
 import org.thingsboard.server.service.security.model.UserPrincipal;
-import org.thingsboard.server.service.telemetry.SessionEvent;
-import org.thingsboard.server.service.telemetry.TelemetryWebSocketMsgEndpoint;
-import org.thingsboard.server.service.telemetry.TelemetryWebSocketService;
-import org.thingsboard.server.service.telemetry.TelemetryWebSocketSessionRef;
+import org.thingsboard.server.service.ws.SessionEvent;
+import org.thingsboard.server.service.ws.WebSocketMsgEndpoint;
+import org.thingsboard.server.service.ws.WebSocketSessionType;
+import org.thingsboard.server.service.ws.telemetry.WebSocketService;
+import org.thingsboard.server.service.ws.WebSocketSessionRef;
 
 import javax.websocket.RemoteEndpoint;
 import javax.websocket.SendHandler;
@@ -57,19 +58,19 @@ import java.util.concurrent.ConcurrentHashMap;
 import java.util.concurrent.ConcurrentMap;
 import java.util.concurrent.LinkedBlockingQueue;
 
-import static org.thingsboard.server.service.telemetry.DefaultTelemetryWebSocketService.NUMBER_OF_PING_ATTEMPTS;
+import static org.thingsboard.server.service.telemetry.DefaultWebSocketService.NUMBER_OF_PING_ATTEMPTS;
 
 @Service
 @TbCoreComponent
 @Slf4j
-public class TbWebSocketHandler extends TextWebSocketHandler implements TelemetryWebSocketMsgEndpoint {
+public class TbWebSocketHandler extends TextWebSocketHandler implements WebSocketMsgEndpoint {
 
     private static final ConcurrentMap<String, SessionMetaData> internalSessionMap = new ConcurrentHashMap<>();
     private static final ConcurrentMap<String, String> externalSessionMap = new ConcurrentHashMap<>();
 
 
     @Autowired
-    private TelemetryWebSocketService webSocketService;
+    private WebSocketService webSocketService;
 
     @Autowired
     private TbTenantProfileCache tenantProfileCache;
@@ -79,7 +80,7 @@ public class TbWebSocketHandler extends TextWebSocketHandler implements Telemetr
     @Value("${server.ws.ping_timeout:30000}")
     private long pingTimeout;
 
-    private ConcurrentMap<String, TelemetryWebSocketSessionRef> blacklistedSessions = new ConcurrentHashMap<>();
+    private ConcurrentMap<String, WebSocketSessionRef> blacklistedSessions = new ConcurrentHashMap<>();
     private ConcurrentMap<String, TbRateLimits> perSessionUpdateLimits = new ConcurrentHashMap<>();
 
     private ConcurrentMap<TenantId, Set<String>> tenantSessionsMap = new ConcurrentHashMap<>();
@@ -130,7 +131,7 @@ public class TbWebSocketHandler extends TextWebSocketHandler implements Telemetr
                 }
             }
             String internalSessionId = session.getId();
-            TelemetryWebSocketSessionRef sessionRef = toRef(session);
+            WebSocketSessionRef sessionRef = toRef(session);
             String externalSessionId = sessionRef.getSessionId();
 
             if (!checkLimits(session, sessionRef)) {
@@ -178,7 +179,7 @@ public class TbWebSocketHandler extends TextWebSocketHandler implements Telemetr
         }
     }
 
-    private void processInWebSocketService(TelemetryWebSocketSessionRef sessionRef, SessionEvent event) {
+    private void processInWebSocketService(WebSocketSessionRef sessionRef, SessionEvent event) {
         try {
             webSocketService.handleWebSocketSessionEvent(sessionRef, event);
         } catch (BeanCreationNotAllowedException e) {
@@ -186,7 +187,7 @@ public class TbWebSocketHandler extends TextWebSocketHandler implements Telemetr
         }
     }
 
-    private TelemetryWebSocketSessionRef toRef(WebSocketSession session) throws IOException {
+    private WebSocketSessionRef toRef(WebSocketSession session) throws IOException {
         URI sessionUri = session.getUri();
         String path = sessionUri.getPath();
         path = path.substring(WebSocketConfiguration.WS_PLUGIN_PREFIX.length());
@@ -195,25 +196,30 @@ public class TbWebSocketHandler extends TextWebSocketHandler implements Telemetr
         }
         String[] pathElements = path.split("/");
         String serviceToken = pathElements[0];
-        if (!"telemetry".equalsIgnoreCase(serviceToken)) {
-            throw new InvalidParameterException("Can't find plugin with specified token!");
-        } else {
-            SecurityUser currentUser = (SecurityUser) ((Authentication) session.getPrincipal()).getPrincipal();
-            return new TelemetryWebSocketSessionRef(UUID.randomUUID().toString(), currentUser, session.getLocalAddress(), session.getRemoteAddress());
-        }
+        WebSocketSessionType sessionType = WebSocketSessionType.forName(serviceToken)
+                .orElseThrow(() -> new InvalidParameterException("Can't find plugin with specified token!"));
+
+        SecurityUser currentUser = (SecurityUser) ((Authentication) session.getPrincipal()).getPrincipal();
+        return WebSocketSessionRef.builder()
+                .sessionId(UUID.randomUUID().toString())
+                .securityCtx(currentUser)
+                .localAddress(session.getLocalAddress())
+                .remoteAddress(session.getRemoteAddress())
+                .sessionType(sessionType)
+                .build();
     }
 
     private class SessionMetaData implements SendHandler {
         private final WebSocketSession session;
         private final RemoteEndpoint.Async asyncRemote;
-        private final TelemetryWebSocketSessionRef sessionRef;
+        private final WebSocketSessionRef sessionRef;
 
         private volatile boolean isSending = false;
         private final Queue<TbWebSocketMsg<?>> msgQueue;
 
         private volatile long lastActivityTime;
 
-        SessionMetaData(WebSocketSession session, TelemetryWebSocketSessionRef sessionRef, int maxMsgQueuePerSession) {
+        SessionMetaData(WebSocketSession session, WebSocketSessionRef sessionRef, int maxMsgQueuePerSession) {
             super();
             this.session = session;
             Session nativeSession = ((NativeWebSocketSession) session).getNativeSession(Session.class);
@@ -309,7 +315,7 @@ public class TbWebSocketHandler extends TextWebSocketHandler implements Telemetr
     }
 
     @Override
-    public void send(TelemetryWebSocketSessionRef sessionRef, int subscriptionId, String msg) throws IOException {
+    public void send(WebSocketSessionRef sessionRef, int subscriptionId, String msg) throws IOException {
         String externalId = sessionRef.getSessionId();
         log.debug("[{}] Processing {}", externalId, msg);
         String internalId = externalSessionMap.get(externalId);
@@ -343,7 +349,7 @@ public class TbWebSocketHandler extends TextWebSocketHandler implements Telemetr
     }
 
     @Override
-    public void sendPing(TelemetryWebSocketSessionRef sessionRef, long currentTime) throws IOException {
+    public void sendPing(WebSocketSessionRef sessionRef, long currentTime) throws IOException {
         String externalId = sessionRef.getSessionId();
         String internalId = externalSessionMap.get(externalId);
         if (internalId != null) {
@@ -359,7 +365,7 @@ public class TbWebSocketHandler extends TextWebSocketHandler implements Telemetr
     }
 
     @Override
-    public void close(TelemetryWebSocketSessionRef sessionRef, CloseStatus reason) throws IOException {
+    public void close(WebSocketSessionRef sessionRef, CloseStatus reason) throws IOException {
         String externalId = sessionRef.getSessionId();
         log.debug("[{}] Processing close request", externalId);
         String internalId = externalSessionMap.get(externalId);
@@ -375,7 +381,7 @@ public class TbWebSocketHandler extends TextWebSocketHandler implements Telemetr
         }
     }
 
-    private boolean checkLimits(WebSocketSession session, TelemetryWebSocketSessionRef sessionRef) throws Exception {
+    private boolean checkLimits(WebSocketSession session, WebSocketSessionRef sessionRef) throws Exception {
         var tenantProfileConfiguration =
                 tenantProfileCache.get(sessionRef.getSecurityCtx().getTenantId()).getDefaultProfileConfiguration();
         if (tenantProfileConfiguration == null) {
@@ -443,7 +449,7 @@ public class TbWebSocketHandler extends TextWebSocketHandler implements Telemetr
         return true;
     }
 
-    private void cleanupLimits(WebSocketSession session, TelemetryWebSocketSessionRef sessionRef) {
+    private void cleanupLimits(WebSocketSession session, WebSocketSessionRef sessionRef) {
         var tenantProfileConfiguration = tenantProfileCache.get(sessionRef.getSecurityCtx().getTenantId()).getDefaultProfileConfiguration();
 
         String sessionId = session.getId();

application/src/main/java/org/thingsboard/server/service/telemetry/exception/AccessDeniedException.java → application/src/main/java/org/thingsboard/server/exception/AccessDeniedException.java

@@ -13,7 +13,7 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-package org.thingsboard.server.service.telemetry.exception;
+package org.thingsboard.server.exception;
 
 import org.springframework.http.HttpStatus;
 import org.springframework.http.ResponseEntity;

application/src/main/java/org/thingsboard/server/service/telemetry/exception/EntityNotFoundException.java → application/src/main/java/org/thingsboard/server/exception/EntityNotFoundException.java

@@ -13,7 +13,7 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-package org.thingsboard.server.service.telemetry.exception;
+package org.thingsboard.server.exception;
 
 import org.springframework.http.HttpStatus;
 import org.springframework.http.ResponseEntity;

application/src/main/java/org/thingsboard/server/service/telemetry/exception/InternalErrorException.java → application/src/main/java/org/thingsboard/server/exception/InternalErrorException.java

@@ -13,7 +13,7 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-package org.thingsboard.server.service.telemetry.exception;
+package org.thingsboard.server.exception;
 
 import org.springframework.http.HttpStatus;
 import org.springframework.http.ResponseEntity;

application/src/main/java/org/thingsboard/server/service/telemetry/exception/InvalidParametersException.java → application/src/main/java/org/thingsboard/server/exception/InvalidParametersException.java

@@ -13,7 +13,7 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-package org.thingsboard.server.service.telemetry.exception;
+package org.thingsboard.server.exception;
 
 import org.springframework.http.HttpStatus;
 import org.springframework.http.ResponseEntity;

application/src/main/java/org/thingsboard/server/service/telemetry/exception/ToErrorResponseEntity.java → application/src/main/java/org/thingsboard/server/exception/ToErrorResponseEntity.java

@@ -13,7 +13,7 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-package org.thingsboard.server.service.telemetry.exception;
+package org.thingsboard.server.exception;
 
 import org.springframework.http.ResponseEntity;
 

application/src/main/java/org/thingsboard/server/service/telemetry/exception/UnauthorizedException.java → application/src/main/java/org/thingsboard/server/exception/UnauthorizedException.java

@@ -13,7 +13,7 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-package org.thingsboard.server.service.telemetry.exception;
+package org.thingsboard.server.exception;
 
 import org.springframework.http.HttpStatus;
 import org.springframework.http.ResponseEntity;

application/src/main/java/org/thingsboard/server/service/telemetry/exception/UncheckedApiException.java → application/src/main/java/org/thingsboard/server/exception/UncheckedApiException.java

@@ -13,7 +13,7 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-package org.thingsboard.server.service.telemetry.exception;
+package org.thingsboard.server.exception;
 
 import org.springframework.http.ResponseEntity;
 

application/src/main/java/org/thingsboard/server/service/notification/DefaultNotificationProcessingService.java

@@ -15,12 +15,15 @@
  */
 package org.thingsboard.server.service.notification;
 
+import com.google.common.base.Strings;
+import lombok.RequiredArgsConstructor;
 import lombok.extern.slf4j.Slf4j;
 import org.springframework.stereotype.Service;
 import org.thingsboard.rule.engine.api.util.TbNodeUtils;
-import org.thingsboard.server.cluster.TbClusterService;
 import org.thingsboard.server.common.data.User;
 import org.thingsboard.server.common.data.exception.ThingsboardException;
+import org.thingsboard.server.common.data.id.NotificationId;
+import org.thingsboard.server.common.data.id.NotificationRequestId;
 import org.thingsboard.server.common.data.id.TenantId;
 import org.thingsboard.server.common.data.id.UserId;
 import org.thingsboard.server.common.data.notification.Notification;
@@ -29,13 +32,12 @@ import org.thingsboard.server.common.data.notification.NotificationStatus;
 import org.thingsboard.server.dao.notification.NotificationService;
 import org.thingsboard.server.dao.notification.NotificationTargetService;
 import org.thingsboard.server.dao.user.UserService;
-import org.thingsboard.server.queue.discovery.PartitionService;
 import org.thingsboard.server.service.executors.DbCallbackExecutorService;
 import org.thingsboard.server.service.security.model.SecurityUser;
 import org.thingsboard.server.service.security.permission.AccessControlService;
 import org.thingsboard.server.service.security.permission.Operation;
 import org.thingsboard.server.service.security.permission.Resource;
-import org.thingsboard.server.service.telemetry.AbstractSubscriptionService;
+import org.thingsboard.server.service.ws.notification.sub.NotificationsSubscriptionService;
 
 import java.util.ArrayList;
 import java.util.List;
@@ -43,26 +45,15 @@ import java.util.Map;
 
 @Service
 @Slf4j
-public class DefaultNotificationProcessingService extends AbstractSubscriptionService implements NotificationProcessingService {
+@RequiredArgsConstructor
+public class DefaultNotificationProcessingService implements NotificationProcessingService {
 
     private final NotificationTargetService notificationTargetService;
     private final NotificationService notificationService;
     private final UserService userService;
     private final AccessControlService accessControlService;
     private final DbCallbackExecutorService dbCallbackExecutorService;
-
-    public DefaultNotificationProcessingService(TbClusterService clusterService, PartitionService partitionService,
-                                                NotificationTargetService notificationTargetService,
-                                                NotificationService notificationService, UserService userService,
-                                                AccessControlService accessControlService,
-                                                DbCallbackExecutorService dbCallbackExecutorService) {
-        super(clusterService, partitionService);
-        this.notificationTargetService = notificationTargetService;
-        this.notificationService = notificationService;
-        this.userService = userService;
-        this.accessControlService = accessControlService;
-        this.dbCallbackExecutorService = dbCallbackExecutorService;
-    }
+    private final NotificationsSubscriptionService notificationsSubscriptionService;
 
     @Override
     public NotificationRequest processNotificationRequest(SecurityUser user, NotificationRequest notificationRequest) throws ThingsboardException {
@@ -83,19 +74,33 @@ public class DefaultNotificationProcessingService extends AbstractSubscriptionSe
 
         for (User recipient : recipients) {
             dbCallbackExecutorService.submit(() -> {
-                Notification notification = createNotification(recipient, notificationRequest);
-                onNewNotification(notification);
+                Notification notification = createNotification(recipient, savedNotificationRequest);
+                notificationsSubscriptionService.onNewNotification(recipient.getTenantId(), recipient.getId(), notification);
             });
         }
 
         return savedNotificationRequest;
     }
 
+    @Override
+    public void markNotificationAsRead(SecurityUser user, NotificationId notificationId) {
+        Notification notification = notificationService.updateNotificationStatus(user.getTenantId(), notificationId, NotificationStatus.READ);
+        notificationsSubscriptionService.onNotificationUpdated(user.getTenantId(), user.getId(), notification);
+    }
+
+    @Override
+    public void deleteNotificationRequest(SecurityUser user, NotificationRequestId notificationRequestId) {
+        notificationService.deleteNotificationRequest(user.getTenantId(), notificationRequestId);
+        notificationsSubscriptionService.onNotificationRequestDeleted(user.getTenantId(), notificationRequestId);
+    }
+
     private Notification createNotification(User recipient, NotificationRequest notificationRequest) {
         Notification notification = Notification.builder()
                 .requestId(notificationRequest.getId())
                 .recipientId(recipient.getId())
+                .reason(notificationRequest.getNotificationReason())
                 .text(formatNotificationText(notificationRequest.getTextTemplate(), recipient))
+                .info(notificationRequest.getNotificationInfo())
                 .severity(notificationRequest.getNotificationSeverity())
                 .status(NotificationStatus.SENT)
                 .build();
@@ -103,24 +108,15 @@ public class DefaultNotificationProcessingService extends AbstractSubscriptionSe
         return notification;
     }
 
-    private void onNewNotification(Notification notification) {
-        wsCallBackExecutor.submit(() -> {
-
-        })
-    }
-
     private String formatNotificationText(String template, User recipient) {
         Map<String, String> context = Map.of(
                 "recipientEmail", recipient.getEmail(),
-                "recipientFirstName", recipient.getFirstName(),
-                "recipientLastName", recipient.getLastName()
+                "recipientFirstName", Strings.nullToEmpty(recipient.getFirstName()),
+                "recipientLastName", Strings.nullToEmpty(recipient.getLastName())
         );
         return TbNodeUtils.processTemplate(template, context);
     }
 
-    @Override
-    protected String getExecutorPrefix() {
-        return "notification";
-    }
+    // handle markAsRead and deleteNotificationRequest - send UnreadNotificationsUpdate with updated list
 
 }

application/src/main/java/org/thingsboard/server/service/notification/NotificationProcessingService.java

@@ -16,6 +16,8 @@
 package org.thingsboard.server.service.notification;
 
 import org.thingsboard.server.common.data.exception.ThingsboardException;
+import org.thingsboard.server.common.data.id.NotificationId;
+import org.thingsboard.server.common.data.id.NotificationRequestId;
 import org.thingsboard.server.common.data.notification.NotificationRequest;
 import org.thingsboard.server.service.security.model.SecurityUser;
 
@@ -23,4 +25,8 @@ public interface NotificationProcessingService {
 
     NotificationRequest processNotificationRequest(SecurityUser user, NotificationRequest notificationRequest) throws ThingsboardException;
 
+    void markNotificationAsRead(SecurityUser user, NotificationId notificationId);
+
+    void deleteNotificationRequest(SecurityUser user, NotificationRequestId notificationRequestId);
+
 }

application/src/main/java/org/thingsboard/server/service/queue/DefaultTbCoreConsumerService.java

@@ -27,7 +27,10 @@ import org.thingsboard.common.util.ThingsBoardThreadFactory;
 import org.thingsboard.server.actors.ActorSystemContext;
 import org.thingsboard.server.common.data.alarm.Alarm;
 import org.thingsboard.server.common.data.id.DeviceId;
+import org.thingsboard.server.common.data.id.NotificationRequestId;
 import org.thingsboard.server.common.data.id.TenantId;
+import org.thingsboard.server.common.data.id.UserId;
+import org.thingsboard.server.common.data.notification.Notification;
 import org.thingsboard.server.common.data.rpc.RpcError;
 import org.thingsboard.server.common.msg.MsgType;
 import org.thingsboard.server.common.msg.TbActorMsg;
@@ -77,6 +80,7 @@ import org.thingsboard.server.service.subscription.TbLocalSubscriptionService;
 import org.thingsboard.server.service.subscription.TbSubscriptionUtils;
 import org.thingsboard.server.service.sync.vc.GitVersionControlQueueService;
 import org.thingsboard.server.service.transport.msg.TransportToDeviceActorMsgWrapper;
+import org.thingsboard.server.service.ws.notification.sub.NotificationsSubscriptionUpdate;
 
 import javax.annotation.PostConstruct;
 import javax.annotation.PreDestroy;
@@ -456,6 +460,13 @@ public class DefaultTbCoreConsumerService extends AbstractConsumerService<ToCore
             localSubscriptionService.onSubscriptionUpdate(msg.getSubUpdate().getSessionId(), TbSubscriptionUtils.fromProto(msg.getSubUpdate()), callback);
         } else if (msg.hasAlarmSubUpdate()) {
             localSubscriptionService.onSubscriptionUpdate(msg.getAlarmSubUpdate().getSessionId(), TbSubscriptionUtils.fromProto(msg.getAlarmSubUpdate()), callback);
+        } else if (msg.hasNotificationsSubUpdate()) {
+            TransportProtos.NotificationsSubscriptionUpdateProto notificationsSubUpdateProto = msg.getNotificationsSubUpdate();
+            NotificationsSubscriptionUpdate notificationsSubscriptionUpdate = NotificationsSubscriptionUpdate.builder()
+                    .notification(JacksonUtil.fromString(notificationsSubUpdateProto.getNotification(), Notification.class))
+                    .build();
+            localSubscriptionService.onSubscriptionUpdate(notificationsSubUpdateProto.getSessionId(),
+                    notificationsSubUpdateProto.getSubscriptionId(), notificationsSubscriptionUpdate, callback);
         } else {
             throwNotHandled(msg, callback);
         }
@@ -468,6 +479,8 @@ public class DefaultTbCoreConsumerService extends AbstractConsumerService<ToCore
             subscriptionManagerService.addSubscription(TbSubscriptionUtils.fromProto(msg.getTelemetrySub()), callback);
         } else if (msg.hasAlarmSub()) {
             subscriptionManagerService.addSubscription(TbSubscriptionUtils.fromProto(msg.getAlarmSub()), callback);
+        } else if (msg.hasNotificationsSub()) {
+            subscriptionManagerService.addSubscription(TbSubscriptionUtils.fromProto(msg.getNotificationsSub()), callback);
         } else if (msg.hasSubClose()) {
             TbSubscriptionCloseProto closeProto = msg.getSubClose();
             subscriptionManagerService.cancelSubscription(closeProto.getSessionId(), closeProto.getSubscriptionId(), callback);
@@ -507,6 +520,18 @@ public class DefaultTbCoreConsumerService extends AbstractConsumerService<ToCore
                     TenantId.fromUUID(new UUID(proto.getTenantIdMSB(), proto.getTenantIdLSB())),
                     TbSubscriptionUtils.toEntityId(proto.getEntityType(), proto.getEntityIdMSB(), proto.getEntityIdLSB()),
                     JacksonUtil.fromString(proto.getAlarm(), Alarm.class), callback);
+        } else if (msg.hasNotificationUpdate()) {
+            TransportProtos.NotificationUpdateProto notificationUpdateProto = msg.getNotificationUpdate();
+            TenantId tenantId = TenantId.fromUUID(new UUID(notificationUpdateProto.getTenantIdMSB(), notificationUpdateProto.getTenantIdLSB()));
+            UserId recipientId = new UserId(new UUID(notificationUpdateProto.getRecipientIdMSB(), notificationUpdateProto.getRecipientIdLSB()));
+            Notification notification = JacksonUtil.fromString(notificationUpdateProto.getNotification(), Notification.class);
+            subscriptionManagerService.onNotificationUpdate(tenantId, recipientId, notification, callback);
+        } else if (msg.hasNotificationRequestDelete()) {
+            TransportProtos.NotificationRequestDeleteProto notificationRequestDeleteProto = msg.getNotificationRequestDelete();
+            TenantId tenantId = TenantId.fromUUID(new UUID(notificationRequestDeleteProto.getTenantIdMSB(), notificationRequestDeleteProto.getTenantIdLSB()));
+            NotificationRequestId notificationRequestId = new NotificationRequestId(new UUID(
+                    notificationRequestDeleteProto.getNotificationRequestIdMSB(), notificationRequestDeleteProto.getNotificationRequestIdLSB()));
+            subscriptionManagerService.onNotificationRequestDeleted(tenantId, notificationRequestId, callback);
         } else {
             throwNotHandled(msg, callback);
         }

application/src/main/java/org/thingsboard/server/service/security/AccessValidator.java

@@ -79,7 +79,7 @@ import org.thingsboard.server.service.security.model.SecurityUser;
 import org.thingsboard.server.service.security.permission.AccessControlService;
 import org.thingsboard.server.service.security.permission.Operation;
 import org.thingsboard.server.service.security.permission.Resource;
-import org.thingsboard.server.service.telemetry.exception.ToErrorResponseEntity;
+import org.thingsboard.server.exception.ToErrorResponseEntity;
 
 import javax.annotation.Nullable;
 import javax.annotation.PostConstruct;

application/src/main/java/org/thingsboard/server/service/security/ValidationCallback.java

@@ -16,10 +16,10 @@
 package org.thingsboard.server.service.security;
 
 import com.google.common.util.concurrent.FutureCallback;
-import org.thingsboard.server.service.telemetry.exception.AccessDeniedException;
-import org.thingsboard.server.service.telemetry.exception.EntityNotFoundException;
-import org.thingsboard.server.service.telemetry.exception.InternalErrorException;
-import org.thingsboard.server.service.telemetry.exception.UnauthorizedException;
+import org.thingsboard.server.exception.AccessDeniedException;
+import org.thingsboard.server.exception.EntityNotFoundException;
+import org.thingsboard.server.exception.InternalErrorException;
+import org.thingsboard.server.exception.UnauthorizedException;
 
 /**
  * Created by ashvayka on 31.03.18.

application/src/main/java/org/thingsboard/server/service/security/permission/TenantAdminPermissions.java

@@ -49,6 +49,7 @@ public class TenantAdminPermissions extends AbstractPermissions {
         put(Resource.RPC, tenantEntityPermissionChecker);
         put(Resource.QUEUE, queuePermissionChecker);
         put(Resource.VERSION_CONTROL, PermissionChecker.allowAllPermissionChecker);
+        put(Resource.NOTIFICATION, PermissionChecker.allowAllPermissionChecker);
     }
 
     public static final PermissionChecker tenantEntityPermissionChecker = new PermissionChecker() {

application/src/main/java/org/thingsboard/server/service/subscription/DefaultSubscriptionManagerService.java

@@ -28,7 +28,9 @@ import org.thingsboard.server.common.data.EntityType;
 import org.thingsboard.server.common.data.alarm.Alarm;
 import org.thingsboard.server.common.data.id.DeviceId;
 import org.thingsboard.server.common.data.id.EntityId;
+import org.thingsboard.server.common.data.id.NotificationRequestId;
 import org.thingsboard.server.common.data.id.TenantId;
+import org.thingsboard.server.common.data.id.UserId;
 import org.thingsboard.server.common.data.kv.Aggregation;
 import org.thingsboard.server.common.data.kv.AttributeKvEntry;
 import org.thingsboard.server.common.data.kv.BaseReadTsKvQuery;
@@ -37,6 +39,7 @@ import org.thingsboard.server.common.data.kv.KvEntry;
 import org.thingsboard.server.common.data.kv.ReadTsKvQuery;
 import org.thingsboard.server.common.data.kv.StringDataEntry;
 import org.thingsboard.server.common.data.kv.TsKvEntry;
+import org.thingsboard.server.common.data.notification.Notification;
 import org.thingsboard.server.common.msg.queue.ServiceType;
 import org.thingsboard.server.common.msg.queue.TbCallback;
 import org.thingsboard.server.common.msg.queue.TopicPartitionInfo;
@@ -59,8 +62,9 @@ import org.thingsboard.server.queue.provider.TbQueueProducerProvider;
 import org.thingsboard.server.queue.util.TbCoreComponent;
 import org.thingsboard.server.service.state.DefaultDeviceStateService;
 import org.thingsboard.server.service.state.DeviceStateService;
-import org.thingsboard.server.service.telemetry.sub.AlarmSubscriptionUpdate;
-import org.thingsboard.server.service.telemetry.sub.TelemetrySubscriptionUpdate;
+import org.thingsboard.server.service.ws.notification.sub.NotificationsSubscriptionUpdate;
+import org.thingsboard.server.service.ws.telemetry.sub.AlarmSubscriptionUpdate;
+import org.thingsboard.server.service.ws.telemetry.sub.TelemetrySubscriptionUpdate;
 
 import javax.annotation.PostConstruct;
 import javax.annotation.PreDestroy;
@@ -325,6 +329,47 @@ public class DefaultSubscriptionManagerService extends TbApplicationEventListene
         callback.onSuccess();
     }
 
+    @Override
+    public void onNotificationUpdate(TenantId tenantId, UserId recipientId, Notification notification, TbCallback callback) {
+        Set<TbSubscription> subscriptions = subscriptionsByEntityId.get(recipientId);
+        if (subscriptions != null) {
+            NotificationsSubscriptionUpdate subscriptionUpdate = NotificationsSubscriptionUpdate.builder()
+                    .notification(notification)
+                    .build();
+            subscriptions.stream()
+                    .filter(subscription -> subscription.getType() == TbSubscriptionType.NOTIFICATIONS)
+                    .forEach(subscription -> {
+                        if (serviceId.equals(subscription.getServiceId())) {
+                            localSubscriptionService.onSubscriptionUpdate(subscription.getSessionId(),
+                                    subscription.getSubscriptionId(), subscriptionUpdate, TbCallback.EMPTY);
+                        } else {
+                            TopicPartitionInfo tpi = notificationsTopicService.getNotificationsTopic(ServiceType.TB_CORE, subscription.getServiceId());
+                            ToCoreNotificationMsg updateProto = TbSubscriptionUtils.notificationsSubUpdateToProto(subscription, subscriptionUpdate);
+                            TbProtoQueueMsg<ToCoreNotificationMsg> queueMsg = new TbProtoQueueMsg<>(subscription.getEntityId().getId(), updateProto);
+                            toCoreNotificationsProducer.send(tpi, queueMsg, null);
+                        }
+                    });
+        }
+        callback.onSuccess();
+    }
+
+    @Override
+    public void onNotificationRequestDeleted(TenantId tenantId, NotificationRequestId notificationRequestId, TbCallback callback) {
+        NotificationsSubscriptionUpdate subscriptionUpdate = NotificationsSubscriptionUpdate.builder()
+                .notificationRequestDeleted(true)
+                .notificationRequestId(notificationRequestId)
+                .build();
+        subscriptionsByEntityId.entrySet().stream()
+                .filter(subEntry -> subEntry.getKey().getEntityType() == EntityType.USER)
+                .flatMap(subEntry -> subEntry.getValue().stream()
+                        .filter(sub -> sub.getType() == TbSubscriptionType.NOTIFICATIONS)
+                        .filter(sub -> sub.getServiceId().equals(serviceId)))
+                .forEach(subscription -> {
+                    localSubscriptionService.onSubscriptionUpdate(subscription.getSessionId(), subscription.getSubscriptionId(), subscriptionUpdate, TbCallback.EMPTY);
+                });
+        callback.onSuccess();
+    }
+
     @Override
     public void onAttributesDelete(TenantId tenantId, EntityId entityId, String scope, List<String> keys, TbCallback callback) {
         onLocalTelemetrySubUpdate(entityId,

application/src/main/java/org/thingsboard/server/service/subscription/DefaultTbEntityDataSubscriptionService.java

@@ -48,22 +48,21 @@ import org.thingsboard.server.dao.timeseries.TimeseriesService;
 import org.thingsboard.server.queue.discovery.TbServiceInfoProvider;
 import org.thingsboard.server.queue.util.TbCoreComponent;
 import org.thingsboard.server.service.executors.DbCallbackExecutorService;
-import org.thingsboard.server.service.telemetry.TelemetryWebSocketService;
-import org.thingsboard.server.service.telemetry.TelemetryWebSocketSessionRef;
-import org.thingsboard.server.service.telemetry.cmd.v2.AggHistoryCmd;
-import org.thingsboard.server.service.telemetry.cmd.v2.AggKey;
-import org.thingsboard.server.service.telemetry.cmd.v2.AggTimeSeriesCmd;
-import org.thingsboard.server.service.telemetry.cmd.v2.AlarmDataCmd;
-import org.thingsboard.server.service.telemetry.cmd.v2.AlarmDataUpdate;
-import org.thingsboard.server.service.telemetry.cmd.v2.EntityCountCmd;
-import org.thingsboard.server.service.telemetry.cmd.v2.EntityDataCmd;
-import org.thingsboard.server.service.telemetry.cmd.v2.EntityDataUpdate;
-import org.thingsboard.server.service.telemetry.cmd.v2.EntityHistoryCmd;
-import org.thingsboard.server.service.telemetry.cmd.v2.GetTsCmd;
-import org.thingsboard.server.service.telemetry.cmd.v2.LatestValueCmd;
-import org.thingsboard.server.service.telemetry.cmd.v2.TimeSeriesCmd;
-import org.thingsboard.server.service.telemetry.cmd.v2.UnsubscribeCmd;
-import org.thingsboard.server.service.telemetry.sub.SubscriptionErrorCode;
+import org.thingsboard.server.service.ws.telemetry.WebSocketService;
+import org.thingsboard.server.service.ws.WebSocketSessionRef;
+import org.thingsboard.server.service.ws.telemetry.cmd.v2.AggHistoryCmd;
+import org.thingsboard.server.service.ws.telemetry.cmd.v2.AggKey;
+import org.thingsboard.server.service.ws.telemetry.cmd.v2.AggTimeSeriesCmd;
+import org.thingsboard.server.service.ws.telemetry.cmd.v2.AlarmDataCmd;
+import org.thingsboard.server.service.ws.telemetry.cmd.v2.AlarmDataUpdate;
+import org.thingsboard.server.service.ws.telemetry.cmd.v2.EntityCountCmd;
+import org.thingsboard.server.service.ws.telemetry.cmd.v2.EntityDataCmd;
+import org.thingsboard.server.service.ws.telemetry.cmd.v2.EntityDataUpdate;
+import org.thingsboard.server.service.ws.telemetry.cmd.v2.EntityHistoryCmd;
+import org.thingsboard.server.service.ws.telemetry.cmd.v2.GetTsCmd;
+import org.thingsboard.server.service.ws.telemetry.cmd.v2.LatestValueCmd;
+import org.thingsboard.server.service.ws.telemetry.cmd.v2.TimeSeriesCmd;
+import org.thingsboard.server.service.ws.telemetry.cmd.v2.UnsubscribeCmd;
 
 import javax.annotation.PostConstruct;
 import javax.annotation.PreDestroy;
@@ -95,7 +94,7 @@ public class DefaultTbEntityDataSubscriptionService implements TbEntityDataSubsc
     private final Map<String, Map<Integer, TbAbstractSubCtx>> subscriptionsBySessionId = new ConcurrentHashMap<>();
 
     @Autowired
-    private TelemetryWebSocketService wsService;
+    private WebSocketService wsService;
 
     @Autowired
     private EntityService entityService;
@@ -166,7 +165,7 @@ public class DefaultTbEntityDataSubscriptionService implements TbEntityDataSubsc
     }
 
     @Override
-    public void handleCmd(TelemetryWebSocketSessionRef session, EntityDataCmd cmd) {
+    public void handleCmd(WebSocketSessionRef session, EntityDataCmd cmd) {
         TbEntityDataSubCtx ctx = getSubCtx(session.getSessionId(), cmd.getCmdId());
         if (ctx != null) {
             log.debug("[{}][{}] Updating existing subscriptions using: {}", session.getSessionId(), cmd.getCmdId(), cmd);
@@ -357,7 +356,7 @@ public class DefaultTbEntityDataSubscriptionService implements TbEntityDataSubsc
     }
 
     @Override
-    public void handleCmd(TelemetryWebSocketSessionRef session, EntityCountCmd cmd) {
+    public void handleCmd(WebSocketSessionRef session, EntityCountCmd cmd) {
         TbEntityCountSubCtx ctx = getSubCtx(session.getSessionId(), cmd.getCmdId());
         if (ctx == null) {
             ctx = createSubCtx(session, cmd);
@@ -377,7 +376,7 @@ public class DefaultTbEntityDataSubscriptionService implements TbEntityDataSubsc
     }
 
     @Override
-    public void handleCmd(TelemetryWebSocketSessionRef session, AlarmDataCmd cmd) {
+    public void handleCmd(WebSocketSessionRef session, AlarmDataCmd cmd) {
         TbAlarmDataSubCtx ctx = getSubCtx(session.getSessionId(), cmd.getCmdId());
         if (ctx == null) {
             log.debug("[{}][{}] Creating new alarm subscription using: {}", session.getSessionId(), cmd.getCmdId(), cmd);
@@ -468,7 +467,7 @@ public class DefaultTbEntityDataSubscriptionService implements TbEntityDataSubsc
         }
     }
 
-    private TbEntityDataSubCtx createSubCtx(TelemetryWebSocketSessionRef sessionRef, EntityDataCmd cmd) {
+    private TbEntityDataSubCtx createSubCtx(WebSocketSessionRef sessionRef, EntityDataCmd cmd) {
         Map<Integer, TbAbstractSubCtx> sessionSubs = subscriptionsBySessionId.computeIfAbsent(sessionRef.getSessionId(), k -> new HashMap<>());
         TbEntityDataSubCtx ctx = new TbEntityDataSubCtx(serviceId, wsService, entityService, localSubscriptionService,
                 attributesService, stats, sessionRef, cmd.getCmdId(), maxEntitiesPerDataSubscription);
@@ -479,7 +478,7 @@ public class DefaultTbEntityDataSubscriptionService implements TbEntityDataSubsc
         return ctx;
     }
 
-    private TbEntityCountSubCtx createSubCtx(TelemetryWebSocketSessionRef sessionRef, EntityCountCmd cmd) {
+    private TbEntityCountSubCtx createSubCtx(WebSocketSessionRef sessionRef, EntityCountCmd cmd) {
         Map<Integer, TbAbstractSubCtx> sessionSubs = subscriptionsBySessionId.computeIfAbsent(sessionRef.getSessionId(), k -> new HashMap<>());
         TbEntityCountSubCtx ctx = new TbEntityCountSubCtx(serviceId, wsService, entityService, localSubscriptionService,
                 attributesService, stats, sessionRef, cmd.getCmdId());
@@ -491,7 +490,7 @@ public class DefaultTbEntityDataSubscriptionService implements TbEntityDataSubsc
     }
 
 
-    private TbAlarmDataSubCtx createSubCtx(TelemetryWebSocketSessionRef sessionRef, AlarmDataCmd cmd) {
+    private TbAlarmDataSubCtx createSubCtx(WebSocketSessionRef sessionRef, AlarmDataCmd cmd) {
         Map<Integer, TbAbstractSubCtx> sessionSubs = subscriptionsBySessionId.computeIfAbsent(sessionRef.getSessionId(), k -> new HashMap<>());
         TbAlarmDataSubCtx ctx = new TbAlarmDataSubCtx(serviceId, wsService, entityService, localSubscriptionService,
                 attributesService, stats, alarmService, sessionRef, cmd.getCmdId(), maxEntitiesPerAlarmSubscription,

application/src/main/java/org/thingsboard/server/service/subscription/DefaultTbLocalSubscriptionService.java

@@ -21,18 +21,19 @@ import org.springframework.context.annotation.Lazy;
 import org.springframework.context.event.EventListener;
 import org.springframework.stereotype.Service;
 import org.thingsboard.common.util.ThingsBoardExecutors;
-import org.thingsboard.server.gen.transport.TransportProtos;
-import org.thingsboard.server.queue.discovery.event.ClusterTopologyChangeEvent;
-import org.thingsboard.server.queue.discovery.event.PartitionChangeEvent;
-import org.thingsboard.server.queue.discovery.PartitionService;
+import org.thingsboard.server.cluster.TbClusterService;
 import org.thingsboard.server.common.msg.queue.ServiceType;
-import org.thingsboard.server.common.msg.queue.TopicPartitionInfo;
 import org.thingsboard.server.common.msg.queue.TbCallback;
+import org.thingsboard.server.common.msg.queue.TopicPartitionInfo;
+import org.thingsboard.server.gen.transport.TransportProtos;
+import org.thingsboard.server.queue.discovery.PartitionService;
 import org.thingsboard.server.queue.discovery.TbApplicationEventListener;
+import org.thingsboard.server.queue.discovery.event.ClusterTopologyChangeEvent;
+import org.thingsboard.server.queue.discovery.event.PartitionChangeEvent;
 import org.thingsboard.server.queue.util.TbCoreComponent;
-import org.thingsboard.server.cluster.TbClusterService;
-import org.thingsboard.server.service.telemetry.sub.AlarmSubscriptionUpdate;
-import org.thingsboard.server.service.telemetry.sub.TelemetrySubscriptionUpdate;
+import org.thingsboard.server.service.ws.notification.sub.NotificationsSubscriptionUpdate;
+import org.thingsboard.server.service.ws.telemetry.sub.AlarmSubscriptionUpdate;
+import org.thingsboard.server.service.ws.telemetry.sub.TelemetrySubscriptionUpdate;
 
 import javax.annotation.PostConstruct;
 import javax.annotation.PreDestroy;
@@ -152,7 +153,7 @@ public class DefaultTbLocalSubscriptionService implements TbLocalSubscriptionSer
                     update.getLatestValues().forEach((key, value) -> attrSub.getKeyStates().put(key, value));
                     break;
             }
-            subscriptionUpdateExecutor.submit(() -> subscription.getUpdateConsumer().accept(sessionId, update));
+            subscriptionUpdateExecutor.submit(() -> subscription.getUpdateProcessor().accept(subscription, update));
         }
         callback.onSuccess();
     }
@@ -163,7 +164,16 @@ public class DefaultTbLocalSubscriptionService implements TbLocalSubscriptionSer
         TbSubscription subscription = subscriptionsBySessionId
                 .getOrDefault(sessionId, Collections.emptyMap()).get(update.getSubscriptionId());
         if (subscription != null && subscription.getType() == TbSubscriptionType.ALARMS) {
-            subscriptionUpdateExecutor.submit(() -> subscription.getUpdateConsumer().accept(sessionId, update));
+            subscriptionUpdateExecutor.submit(() -> subscription.getUpdateProcessor().accept(subscription, update));
+        }
+        callback.onSuccess();
+    }
+
+    @Override
+    public void onSubscriptionUpdate(String sessionId, int subscriptionId, NotificationsSubscriptionUpdate update, TbCallback callback) {
+        TbSubscription subscription = subscriptionsBySessionId.getOrDefault(sessionId, Collections.emptyMap()).get(subscriptionId);
+        if (subscription != null && subscription.getType() == TbSubscriptionType.NOTIFICATIONS) {
+            subscriptionUpdateExecutor.submit(() -> subscription.getUpdateProcessor().accept(subscription, update));
         }
         callback.onSuccess();
     }

application/src/main/java/org/thingsboard/server/service/subscription/ReadTsKvQueryInfo.java

@@ -17,7 +17,7 @@ package org.thingsboard.server.service.subscription;
 
 import lombok.Data;
 import org.thingsboard.server.common.data.kv.ReadTsKvQuery;
-import org.thingsboard.server.service.telemetry.cmd.v2.AggKey;
+import org.thingsboard.server.service.ws.telemetry.cmd.v2.AggKey;
 
 @Data
 public class ReadTsKvQueryInfo {

application/src/main/java/org/thingsboard/server/service/telemetry/sub/SubscriptionErrorCode.java → application/src/main/java/org/thingsboard/server/service/subscription/SubscriptionErrorCode.java

@@ -13,7 +13,7 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-package org.thingsboard.server.service.telemetry.sub;
+package org.thingsboard.server.service.subscription;
 
 public enum SubscriptionErrorCode {
 

application/src/main/java/org/thingsboard/server/service/subscription/SubscriptionManagerService.java

@@ -18,9 +18,12 @@ package org.thingsboard.server.service.subscription;
 import org.springframework.context.ApplicationListener;
 import org.thingsboard.server.common.data.alarm.Alarm;
 import org.thingsboard.server.common.data.id.EntityId;
+import org.thingsboard.server.common.data.id.NotificationRequestId;
 import org.thingsboard.server.common.data.id.TenantId;
+import org.thingsboard.server.common.data.id.UserId;
 import org.thingsboard.server.common.data.kv.AttributeKvEntry;
 import org.thingsboard.server.common.data.kv.TsKvEntry;
+import org.thingsboard.server.common.data.notification.Notification;
 import org.thingsboard.server.common.msg.queue.TbCallback;
 import org.thingsboard.server.queue.discovery.event.PartitionChangeEvent;
 
@@ -46,5 +49,8 @@ public interface SubscriptionManagerService extends ApplicationListener<Partitio
 
     void onAlarmDeleted(TenantId tenantId, EntityId entityId, Alarm alarm, TbCallback callback);
 
+    void onNotificationUpdate(TenantId tenantId, UserId recipientId, Notification notification, TbCallback callback);
+
+    void onNotificationRequestDeleted(TenantId tenantId, NotificationRequestId notificationRequestId, TbCallback callback);
 
 }

application/src/main/java/org/thingsboard/server/service/subscription/TbAbstractDataSubCtx.java

@@ -28,9 +28,9 @@ import org.thingsboard.server.common.data.query.EntityKeyType;
 import org.thingsboard.server.common.data.query.TsValue;
 import org.thingsboard.server.dao.attributes.AttributesService;
 import org.thingsboard.server.dao.entity.EntityService;
-import org.thingsboard.server.service.telemetry.TelemetryWebSocketService;
-import org.thingsboard.server.service.telemetry.TelemetryWebSocketSessionRef;
-import org.thingsboard.server.service.telemetry.sub.TelemetrySubscriptionUpdate;
+import org.thingsboard.server.service.ws.WebSocketSessionRef;
+import org.thingsboard.server.service.ws.telemetry.WebSocketService;
+import org.thingsboard.server.service.ws.telemetry.sub.TelemetrySubscriptionUpdate;
 
 import java.util.ArrayList;
 import java.util.Arrays;
@@ -49,10 +49,10 @@ public abstract class TbAbstractDataSubCtx<T extends AbstractDataQuery<? extends
     @Getter
     protected PageData<EntityData> data;
 
-    public TbAbstractDataSubCtx(String serviceId, TelemetryWebSocketService wsService,
+    public TbAbstractDataSubCtx(String serviceId, WebSocketService wsService,
                                 EntityService entityService, TbLocalSubscriptionService localSubscriptionService,
                                 AttributesService attributesService, SubscriptionServiceStatistics stats,
-                                TelemetryWebSocketSessionRef sessionRef, int cmdId) {
+                                WebSocketSessionRef sessionRef, int cmdId) {
         super(serviceId, wsService, entityService, localSubscriptionService, attributesService, stats, sessionRef, cmdId);
         this.subToEntityIdMap = new ConcurrentHashMap<>();
     }
@@ -184,7 +184,7 @@ public abstract class TbAbstractDataSubCtx<T extends AbstractDataQuery<? extends
                 .subscriptionId(subIdx)
                 .tenantId(sessionRef.getSecurityCtx().getTenantId())
                 .entityId(entityData.getEntityId())
-                .updateConsumer((s, subscriptionUpdate) -> sendWsMsg(s, subscriptionUpdate, keysType))
+                .updateProcessor((sub, subscriptionUpdate) -> sendWsMsg(sub.getSessionId(), subscriptionUpdate, keysType))
                 .allKeys(false)
                 .keyStates(keyStates)
                 .scope(scope)
@@ -215,7 +215,7 @@ public abstract class TbAbstractDataSubCtx<T extends AbstractDataQuery<? extends
                 .subscriptionId(subIdx)
                 .tenantId(sessionRef.getSecurityCtx().getTenantId())
                 .entityId(entityData.getEntityId())
-                .updateConsumer((sessionId, subscriptionUpdate) -> sendWsMsg(sessionId, subscriptionUpdate, EntityKeyType.TIME_SERIES, resultToLatestValues))
+                .updateProcessor((sub, subscriptionUpdate) -> sendWsMsg(sub.getSessionId(), subscriptionUpdate, EntityKeyType.TIME_SERIES, resultToLatestValues))
                 .allKeys(false)
                 .keyStates(keyStates)
                 .latestValues(latestValues)

application/src/main/java/org/thingsboard/server/service/subscription/TbAbstractSubCtx.java

@@ -31,7 +31,6 @@ import org.thingsboard.server.common.data.query.ComplexFilterPredicate;
 import org.thingsboard.server.common.data.query.DynamicValue;
 import org.thingsboard.server.common.data.query.DynamicValueSourceType;
 import org.thingsboard.server.common.data.query.EntityCountQuery;
-import org.thingsboard.server.common.data.query.EntityKeyType;
 import org.thingsboard.server.common.data.query.FilterPredicateType;
 import org.thingsboard.server.common.data.query.KeyFilter;
 import org.thingsboard.server.common.data.query.KeyFilterPredicate;
@@ -39,10 +38,10 @@ import org.thingsboard.server.common.data.query.SimpleKeyFilterPredicate;
 import org.thingsboard.server.common.data.query.TsValue;
 import org.thingsboard.server.dao.attributes.AttributesService;
 import org.thingsboard.server.dao.entity.EntityService;
-import org.thingsboard.server.service.telemetry.TelemetryWebSocketService;
-import org.thingsboard.server.service.telemetry.TelemetryWebSocketSessionRef;
-import org.thingsboard.server.service.telemetry.cmd.v2.CmdUpdate;
-import org.thingsboard.server.service.telemetry.sub.TelemetrySubscriptionUpdate;
+import org.thingsboard.server.service.ws.WebSocketSessionRef;
+import org.thingsboard.server.service.ws.telemetry.WebSocketService;
+import org.thingsboard.server.service.ws.telemetry.cmd.v2.CmdUpdate;
+import org.thingsboard.server.service.ws.telemetry.sub.TelemetrySubscriptionUpdate;
 
 import java.util.ArrayList;
 import java.util.HashMap;
@@ -64,11 +63,11 @@ public abstract class TbAbstractSubCtx<T extends EntityCountQuery> {
     protected final Lock wsLock = new ReentrantLock(true);
     protected final String serviceId;
     protected final SubscriptionServiceStatistics stats;
-    private final TelemetryWebSocketService wsService;
+    private final WebSocketService wsService;
     protected final EntityService entityService;
     protected final TbLocalSubscriptionService localSubscriptionService;
     protected final AttributesService attributesService;
-    protected final TelemetryWebSocketSessionRef sessionRef;
+    protected final WebSocketSessionRef sessionRef;
     protected final int cmdId;
     protected final Set<Integer> subToDynamicValueKeySet;
     @Getter
@@ -80,10 +79,10 @@ public abstract class TbAbstractSubCtx<T extends EntityCountQuery> {
     protected volatile ScheduledFuture<?> refreshTask;
     protected volatile boolean stopped;
 
-    public TbAbstractSubCtx(String serviceId, TelemetryWebSocketService wsService,
+    public TbAbstractSubCtx(String serviceId, WebSocketService wsService,
                             EntityService entityService, TbLocalSubscriptionService localSubscriptionService,
                             AttributesService attributesService, SubscriptionServiceStatistics stats,
-                            TelemetryWebSocketSessionRef sessionRef, int cmdId) {
+                            WebSocketSessionRef sessionRef, int cmdId) {
         this.serviceId = serviceId;
         this.wsService = wsService;
         this.entityService = entityService;
@@ -142,7 +141,7 @@ public abstract class TbAbstractSubCtx<T extends EntityCountQuery> {
                         .subscriptionId(subIdx)
                         .tenantId(sessionRef.getSecurityCtx().getTenantId())
                         .entityId(entityId)
-                        .updateConsumer((s, subscriptionUpdate) -> dynamicValueSubUpdate(s, subscriptionUpdate, dynamicValueKeySubMap))
+                        .updateProcessor((subscription, subscriptionUpdate) -> dynamicValueSubUpdate(subscription.getSessionId(), subscriptionUpdate, dynamicValueKeySubMap))
                         .allKeys(false)
                         .keyStates(keyStates)
                         .scope(TbAttributeSubscriptionScope.SERVER_SCOPE)

application/src/main/java/org/thingsboard/server/service/subscription/TbAlarmDataSubCtx.java

@@ -38,11 +38,11 @@ import org.thingsboard.server.dao.alarm.AlarmService;
 import org.thingsboard.server.dao.attributes.AttributesService;
 import org.thingsboard.server.dao.entity.EntityService;
 import org.thingsboard.server.dao.model.ModelConstants;
-import org.thingsboard.server.service.telemetry.TelemetryWebSocketService;
-import org.thingsboard.server.service.telemetry.TelemetryWebSocketSessionRef;
-import org.thingsboard.server.service.telemetry.cmd.v2.AlarmDataUpdate;
-import org.thingsboard.server.service.telemetry.sub.AlarmSubscriptionUpdate;
-import org.thingsboard.server.service.telemetry.sub.TelemetrySubscriptionUpdate;
+import org.thingsboard.server.service.ws.telemetry.WebSocketService;
+import org.thingsboard.server.service.ws.WebSocketSessionRef;
+import org.thingsboard.server.service.ws.telemetry.cmd.v2.AlarmDataUpdate;
+import org.thingsboard.server.service.ws.telemetry.sub.AlarmSubscriptionUpdate;
+import org.thingsboard.server.service.ws.telemetry.sub.TelemetrySubscriptionUpdate;
 
 import java.util.ArrayList;
 import java.util.Collection;
@@ -81,10 +81,10 @@ public class TbAlarmDataSubCtx extends TbAbstractDataSubCtx<AlarmDataQuery> {
 
     private int alarmInvocationAttempts;
 
-    public TbAlarmDataSubCtx(String serviceId, TelemetryWebSocketService wsService,
+    public TbAlarmDataSubCtx(String serviceId, WebSocketService wsService,
                              EntityService entityService, TbLocalSubscriptionService localSubscriptionService,
                              AttributesService attributesService, SubscriptionServiceStatistics stats, AlarmService alarmService,
-                             TelemetryWebSocketSessionRef sessionRef, int cmdId,
+                             WebSocketSessionRef sessionRef, int cmdId,
                              int maxEntitiesPerAlarmSubscription, int maxAlarmQueriesPerRefreshInterval) {
         super(serviceId, wsService, entityService, localSubscriptionService, attributesService, stats, sessionRef, cmdId);
         this.maxEntitiesPerAlarmSubscription = maxEntitiesPerAlarmSubscription;
@@ -175,7 +175,7 @@ public class TbAlarmDataSubCtx extends TbAbstractDataSubCtx<AlarmDataQuery> {
                 .subscriptionId(subIdx)
                 .tenantId(sessionRef.getSecurityCtx().getTenantId())
                 .entityId(entityData.getEntityId())
-                .updateConsumer(this::sendWsMsg)
+                .updateProcessor((sub, update) -> sendWsMsg(sub.getSessionId(), update))
                 .ts(startTs)
                 .build();
         localSubscriptionService.addSubscription(subscription);

application/src/main/java/org/thingsboard/server/service/subscription/TbAlarmsSubscription.java

@@ -17,13 +17,10 @@ package org.thingsboard.server.service.subscription;
 
 import lombok.Builder;
 import lombok.Getter;
-import org.thingsboard.server.common.data.alarm.AlarmSearchStatus;
-import org.thingsboard.server.common.data.alarm.AlarmSeverity;
 import org.thingsboard.server.common.data.id.EntityId;
 import org.thingsboard.server.common.data.id.TenantId;
-import org.thingsboard.server.service.telemetry.sub.AlarmSubscriptionUpdate;
+import org.thingsboard.server.service.ws.telemetry.sub.AlarmSubscriptionUpdate;
 
-import java.util.List;
 import java.util.function.BiConsumer;
 
 public class TbAlarmsSubscription extends TbSubscription<AlarmSubscriptionUpdate> {
@@ -33,8 +30,8 @@ public class TbAlarmsSubscription extends TbSubscription<AlarmSubscriptionUpdate
 
     @Builder
     public TbAlarmsSubscription(String serviceId, String sessionId, int subscriptionId, TenantId tenantId, EntityId entityId,
-                                BiConsumer<String, AlarmSubscriptionUpdate> updateConsumer, long ts) {
-        super(serviceId, sessionId, subscriptionId, tenantId, entityId, TbSubscriptionType.ALARMS, updateConsumer);
+                                BiConsumer<TbSubscription<AlarmSubscriptionUpdate>, AlarmSubscriptionUpdate> updateProcessor, long ts) {
+        super(serviceId, sessionId, subscriptionId, tenantId, entityId, TbSubscriptionType.ALARMS, updateProcessor);
         this.ts = ts;
     }
 

application/src/main/java/org/thingsboard/server/service/subscription/TbAttributeSubscription.java

@@ -19,7 +19,7 @@ import lombok.Builder;
 import lombok.Getter;
 import org.thingsboard.server.common.data.id.EntityId;
 import org.thingsboard.server.common.data.id.TenantId;
-import org.thingsboard.server.service.telemetry.sub.TelemetrySubscriptionUpdate;
+import org.thingsboard.server.service.ws.telemetry.sub.TelemetrySubscriptionUpdate;
 
 import java.util.Map;
 import java.util.function.BiConsumer;
@@ -32,9 +32,9 @@ public class TbAttributeSubscription extends TbSubscription<TelemetrySubscriptio
 
     @Builder
     public TbAttributeSubscription(String serviceId, String sessionId, int subscriptionId, TenantId tenantId, EntityId entityId,
-                                   BiConsumer<String, TelemetrySubscriptionUpdate> updateConsumer,
+                                   BiConsumer<TbSubscription<TelemetrySubscriptionUpdate>, TelemetrySubscriptionUpdate> updateProcessor,
                                    boolean allKeys, Map<String, Long> keyStates, TbAttributeSubscriptionScope scope) {
-        super(serviceId, sessionId, subscriptionId, tenantId, entityId, TbSubscriptionType.ATTRIBUTES, updateConsumer);
+        super(serviceId, sessionId, subscriptionId, tenantId, entityId, TbSubscriptionType.ATTRIBUTES, updateProcessor);
         this.allKeys = allKeys;
         this.keyStates = keyStates;
         this.scope = scope;

application/src/main/java/org/thingsboard/server/service/subscription/TbEntityCountSubCtx.java

@@ -19,18 +19,18 @@ import lombok.extern.slf4j.Slf4j;
 import org.thingsboard.server.common.data.query.EntityCountQuery;
 import org.thingsboard.server.dao.attributes.AttributesService;
 import org.thingsboard.server.dao.entity.EntityService;
-import org.thingsboard.server.service.telemetry.TelemetryWebSocketService;
-import org.thingsboard.server.service.telemetry.TelemetryWebSocketSessionRef;
-import org.thingsboard.server.service.telemetry.cmd.v2.EntityCountUpdate;
+import org.thingsboard.server.service.ws.telemetry.WebSocketService;
+import org.thingsboard.server.service.ws.WebSocketSessionRef;
+import org.thingsboard.server.service.ws.telemetry.cmd.v2.EntityCountUpdate;
 
 @Slf4j
 public class TbEntityCountSubCtx extends TbAbstractSubCtx<EntityCountQuery> {
 
     private volatile int result;
 
-    public TbEntityCountSubCtx(String serviceId, TelemetryWebSocketService wsService, EntityService entityService,
+    public TbEntityCountSubCtx(String serviceId, WebSocketService wsService, EntityService entityService,
                                TbLocalSubscriptionService localSubscriptionService, AttributesService attributesService,
-                               SubscriptionServiceStatistics stats, TelemetryWebSocketSessionRef sessionRef, int cmdId) {
+                               SubscriptionServiceStatistics stats, WebSocketSessionRef sessionRef, int cmdId) {
         super(serviceId, wsService, entityService, localSubscriptionService, attributesService, stats, sessionRef, cmdId);
     }
 

application/src/main/java/org/thingsboard/server/service/subscription/TbEntityDataSubCtx.java

@@ -27,13 +27,13 @@ import org.thingsboard.server.common.data.query.EntityKeyType;
 import org.thingsboard.server.common.data.query.TsValue;
 import org.thingsboard.server.dao.attributes.AttributesService;
 import org.thingsboard.server.dao.entity.EntityService;
-import org.thingsboard.server.service.telemetry.TelemetryWebSocketService;
-import org.thingsboard.server.service.telemetry.TelemetryWebSocketSessionRef;
-import org.thingsboard.server.service.telemetry.cmd.v2.EntityDataCmd;
-import org.thingsboard.server.service.telemetry.cmd.v2.EntityDataUpdate;
-import org.thingsboard.server.service.telemetry.cmd.v2.LatestValueCmd;
-import org.thingsboard.server.service.telemetry.cmd.v2.TimeSeriesCmd;
-import org.thingsboard.server.service.telemetry.sub.TelemetrySubscriptionUpdate;
+import org.thingsboard.server.service.ws.telemetry.WebSocketService;
+import org.thingsboard.server.service.ws.WebSocketSessionRef;
+import org.thingsboard.server.service.ws.telemetry.cmd.v2.EntityDataCmd;
+import org.thingsboard.server.service.ws.telemetry.cmd.v2.EntityDataUpdate;
+import org.thingsboard.server.service.ws.telemetry.cmd.v2.LatestValueCmd;
+import org.thingsboard.server.service.ws.telemetry.cmd.v2.TimeSeriesCmd;
+import org.thingsboard.server.service.ws.telemetry.sub.TelemetrySubscriptionUpdate;
 
 import java.util.ArrayList;
 import java.util.Collections;
@@ -58,9 +58,9 @@ public class TbEntityDataSubCtx extends TbAbstractDataSubCtx<EntityDataQuery> {
     private final int maxEntitiesPerDataSubscription;
     private Map<EntityId, Map<String, TsValue>> latestTsEntityData;
 
-    public TbEntityDataSubCtx(String serviceId, TelemetryWebSocketService wsService, EntityService entityService,
+    public TbEntityDataSubCtx(String serviceId, WebSocketService wsService, EntityService entityService,
                               TbLocalSubscriptionService localSubscriptionService, AttributesService attributesService,
-                              SubscriptionServiceStatistics stats, TelemetryWebSocketSessionRef sessionRef, int cmdId, int maxEntitiesPerDataSubscription) {
+                              SubscriptionServiceStatistics stats, WebSocketSessionRef sessionRef, int cmdId, int maxEntitiesPerDataSubscription) {
         super(serviceId, wsService, entityService, localSubscriptionService, attributesService, stats, sessionRef, cmdId);
         this.maxEntitiesPerDataSubscription = maxEntitiesPerDataSubscription;
     }

application/src/main/java/org/thingsboard/server/service/subscription/TbEntityDataSubscriptionService.java

@@ -15,20 +15,19 @@
  */
 package org.thingsboard.server.service.subscription;
 
-import org.thingsboard.server.service.telemetry.TelemetryWebSocketSessionRef;
-import org.thingsboard.server.service.telemetry.cmd.v2.AlarmDataCmd;
-import org.thingsboard.server.service.telemetry.cmd.v2.EntityCountCmd;
-import org.thingsboard.server.service.telemetry.cmd.v2.EntityDataCmd;
-import org.thingsboard.server.service.telemetry.cmd.v2.EntityDataUnsubscribeCmd;
-import org.thingsboard.server.service.telemetry.cmd.v2.UnsubscribeCmd;
+import org.thingsboard.server.service.ws.WebSocketSessionRef;
+import org.thingsboard.server.service.ws.telemetry.cmd.v2.AlarmDataCmd;
+import org.thingsboard.server.service.ws.telemetry.cmd.v2.EntityCountCmd;
+import org.thingsboard.server.service.ws.telemetry.cmd.v2.EntityDataCmd;
+import org.thingsboard.server.service.ws.telemetry.cmd.v2.UnsubscribeCmd;
 
 public interface TbEntityDataSubscriptionService {
 
-    void handleCmd(TelemetryWebSocketSessionRef sessionId, EntityDataCmd cmd);
+    void handleCmd(WebSocketSessionRef sessionId, EntityDataCmd cmd);
 
-    void handleCmd(TelemetryWebSocketSessionRef sessionId, EntityCountCmd cmd);
+    void handleCmd(WebSocketSessionRef sessionId, EntityCountCmd cmd);
 
-    void handleCmd(TelemetryWebSocketSessionRef sessionId, AlarmDataCmd cmd);
+    void handleCmd(WebSocketSessionRef sessionId, AlarmDataCmd cmd);
 
     void cancelSubscription(String sessionId, UnsubscribeCmd subscriptionId);
 

application/src/main/java/org/thingsboard/server/service/subscription/TbLocalSubscriptionService.java

@@ -18,8 +18,9 @@ package org.thingsboard.server.service.subscription;
 import org.thingsboard.server.queue.discovery.event.ClusterTopologyChangeEvent;
 import org.thingsboard.server.queue.discovery.event.PartitionChangeEvent;
 import org.thingsboard.server.common.msg.queue.TbCallback;
-import org.thingsboard.server.service.telemetry.sub.AlarmSubscriptionUpdate;
-import org.thingsboard.server.service.telemetry.sub.TelemetrySubscriptionUpdate;
+import org.thingsboard.server.service.ws.notification.sub.NotificationsSubscriptionUpdate;
+import org.thingsboard.server.service.ws.telemetry.sub.AlarmSubscriptionUpdate;
+import org.thingsboard.server.service.ws.telemetry.sub.TelemetrySubscriptionUpdate;
 
 public interface TbLocalSubscriptionService {
 
@@ -33,6 +34,8 @@ public interface TbLocalSubscriptionService {
 
     void onSubscriptionUpdate(String sessionId, AlarmSubscriptionUpdate update, TbCallback callback);
 
+    void onSubscriptionUpdate(String sessionId, int subscriptionId, NotificationsSubscriptionUpdate update, TbCallback callback);
+
     void onApplicationEvent(PartitionChangeEvent event);
 
     void onApplicationEvent(ClusterTopologyChangeEvent event);

application/src/main/java/org/thingsboard/server/service/subscription/TbSubscription.java

@@ -33,7 +33,7 @@ public abstract class TbSubscription<T> {
     private final TenantId tenantId;
     private final EntityId entityId;
     private final TbSubscriptionType type;
-    private final BiConsumer<String, T> updateConsumer;
+    private final BiConsumer<? extends TbSubscription<T>, T> updateProcessor;
 
     @Override
     public boolean equals(Object o) {

application/src/main/java/org/thingsboard/server/service/subscription/TbSubscriptionType.java

@@ -16,5 +16,5 @@
 package org.thingsboard.server.service.subscription;
 
 public enum TbSubscriptionType {
-    TIMESERIES, ATTRIBUTES, ALARMS
+    TIMESERIES, ATTRIBUTES, ALARMS, NOTIFICATIONS
 }

application/src/main/java/org/thingsboard/server/service/subscription/TbSubscriptionUtils.java

@@ -19,7 +19,9 @@ import org.thingsboard.common.util.JacksonUtil;
 import org.thingsboard.server.common.data.alarm.Alarm;
 import org.thingsboard.server.common.data.id.EntityId;
 import org.thingsboard.server.common.data.id.EntityIdFactory;
+import org.thingsboard.server.common.data.id.NotificationRequestId;
 import org.thingsboard.server.common.data.id.TenantId;
+import org.thingsboard.server.common.data.id.UserId;
 import org.thingsboard.server.common.data.kv.AttributeKvEntry;
 import org.thingsboard.server.common.data.kv.BaseAttributeKvEntry;
 import org.thingsboard.server.common.data.kv.BasicTsKvEntry;
@@ -31,6 +33,7 @@ import org.thingsboard.server.common.data.kv.KvEntry;
 import org.thingsboard.server.common.data.kv.LongDataEntry;
 import org.thingsboard.server.common.data.kv.StringDataEntry;
 import org.thingsboard.server.common.data.kv.TsKvEntry;
+import org.thingsboard.server.common.data.notification.Notification;
 import org.thingsboard.server.gen.transport.TransportProtos;
 import org.thingsboard.server.gen.transport.TransportProtos.KeyValueProto;
 import org.thingsboard.server.gen.transport.TransportProtos.KeyValueType;
@@ -50,9 +53,10 @@ import org.thingsboard.server.gen.transport.TransportProtos.TbTimeSeriesSubscrip
 import org.thingsboard.server.gen.transport.TransportProtos.TbTimeSeriesUpdateProto;
 import org.thingsboard.server.gen.transport.TransportProtos.ToCoreMsg;
 import org.thingsboard.server.gen.transport.TransportProtos.TsKvProto;
-import org.thingsboard.server.service.telemetry.sub.AlarmSubscriptionUpdate;
-import org.thingsboard.server.service.telemetry.sub.SubscriptionErrorCode;
-import org.thingsboard.server.service.telemetry.sub.TelemetrySubscriptionUpdate;
+import org.thingsboard.server.service.ws.notification.sub.NotificationsSubscriptionUpdate;
+import org.thingsboard.server.service.ws.notification.sub.NotificationsSubscription;
+import org.thingsboard.server.service.ws.telemetry.sub.AlarmSubscriptionUpdate;
+import org.thingsboard.server.service.ws.telemetry.sub.TelemetrySubscriptionUpdate;
 
 import java.util.ArrayList;
 import java.util.HashMap;
@@ -105,6 +109,12 @@ public class TbSubscriptionUtils {
                         .setTs(alarmSub.getTs());
                 msgBuilder.setAlarmSub(alarmSubProto.build());
                 break;
+            case NOTIFICATIONS:
+                NotificationsSubscription notificationsSub = (NotificationsSubscription) subscription;
+                msgBuilder.setNotificationsSub(TransportProtos.NotificationsSubscriptionProto.newBuilder()
+                        .setSub(subscriptionProto)
+                        .setLimit(notificationsSub.getLimit()));
+                break;
         }
         return ToCoreMsg.newBuilder().setToSubscriptionMgrMsg(msgBuilder.build()).build();
     }
@@ -166,6 +176,18 @@ public class TbSubscriptionUtils {
         return builder.build();
     }
 
+    public static NotificationsSubscription fromProto(TransportProtos.NotificationsSubscriptionProto notificationsSub) {
+        TbSubscriptionProto sub = notificationsSub.getSub();
+        return NotificationsSubscription.builder()
+                .serviceId(sub.getServiceId())
+                .sessionId(sub.getSessionId())
+                .subscriptionId(sub.getSubscriptionId())
+                .tenantId(TenantId.fromUUID(new UUID(sub.getTenantIdMSB(), sub.getTenantIdLSB())))
+                .entityId(EntityIdFactory.getByTypeAndUuid(sub.getEntityType(), new UUID(sub.getEntityIdMSB(), sub.getEntityIdLSB())))
+                .limit(notificationsSub.getLimit())
+                .build();
+    }
+
     public static TelemetrySubscriptionUpdate fromProto(TbSubscriptionUpdateProto proto) {
         if (proto.getErrorCode() > 0) {
             return new TelemetrySubscriptionUpdate(proto.getSubscriptionId(), SubscriptionErrorCode.forCode(proto.getErrorCode()), proto.getErrorMsg());
@@ -340,4 +362,47 @@ public class TbSubscriptionUtils {
         msgBuilder.setAlarmDelete(builder);
         return ToCoreMsg.newBuilder().setToSubscriptionMgrMsg(msgBuilder.build()).build();
     }
+
+    public static TransportProtos.ToCoreNotificationMsg notificationsSubUpdateToProto(TbSubscription subscription, NotificationsSubscriptionUpdate update) {
+        TransportProtos.NotificationsSubscriptionUpdateProto updateProto = TransportProtos.NotificationsSubscriptionUpdateProto.newBuilder()
+                .setSessionId(subscription.getSessionId())
+                .setSubscriptionId(subscription.getSubscriptionId())
+                .setNotification(JacksonUtil.toString(update.getNotification()))
+                .build();
+        return TransportProtos.ToCoreNotificationMsg.newBuilder()
+                .setToLocalSubscriptionServiceMsg(TransportProtos.LocalSubscriptionServiceMsgProto.newBuilder()
+                        .setNotificationsSubUpdate(updateProto)
+                        .build())
+                .build();
+    }
+
+    public static ToCoreMsg notificationUpdateToProto(TenantId tenantId, UserId recipientId, Notification notification) {
+        TransportProtos.NotificationUpdateProto updateProto = TransportProtos.NotificationUpdateProto.newBuilder()
+                .setTenantIdMSB(tenantId.getId().getMostSignificantBits())
+                .setTenantIdLSB(tenantId.getId().getLeastSignificantBits())
+                .setRecipientIdMSB(recipientId.getId().getMostSignificantBits())
+                .setRecipientIdLSB(recipientId.getId().getLeastSignificantBits())
+                .setNotification(JacksonUtil.toString(notification))
+                .build();
+        return ToCoreMsg.newBuilder()
+                .setToSubscriptionMgrMsg(SubscriptionMgrMsgProto.newBuilder()
+                        .setNotificationUpdate(updateProto)
+                        .build())
+                .build();
+    }
+
+    public static ToCoreMsg notificationRequestDeletedToProto(TenantId tenantId, NotificationRequestId notificationRequestId) {
+        TransportProtos.NotificationRequestDeleteProto deleteProto = TransportProtos.NotificationRequestDeleteProto.newBuilder()
+                .setTenantIdMSB(tenantId.getId().getMostSignificantBits())
+                .setTenantIdLSB(tenantId.getId().getLeastSignificantBits())
+                .setNotificationRequestIdMSB(notificationRequestId.getId().getMostSignificantBits())
+                .setNotificationRequestIdLSB(notificationRequestId.getId().getLeastSignificantBits())
+                .build();
+        return ToCoreMsg.newBuilder()
+                .setToSubscriptionMgrMsg(SubscriptionMgrMsgProto.newBuilder()
+                        .setNotificationRequestDelete(deleteProto)
+                        .build())
+                .build();
+    }
+
 }

application/src/main/java/org/thingsboard/server/service/subscription/TbTimeseriesSubscription.java

@@ -19,7 +19,7 @@ import lombok.Builder;
 import lombok.Getter;
 import org.thingsboard.server.common.data.id.EntityId;
 import org.thingsboard.server.common.data.id.TenantId;
-import org.thingsboard.server.service.telemetry.sub.TelemetrySubscriptionUpdate;
+import org.thingsboard.server.service.ws.telemetry.sub.TelemetrySubscriptionUpdate;
 
 import java.util.Map;
 import java.util.function.BiConsumer;
@@ -39,9 +39,9 @@ public class TbTimeseriesSubscription extends TbSubscription<TelemetrySubscripti
 
     @Builder
     public TbTimeseriesSubscription(String serviceId, String sessionId, int subscriptionId, TenantId tenantId, EntityId entityId,
-                                    BiConsumer<String, TelemetrySubscriptionUpdate> updateConsumer,
+                                    BiConsumer<TbSubscription<TelemetrySubscriptionUpdate>, TelemetrySubscriptionUpdate> updateProcessor,
                                     boolean allKeys, Map<String, Long> keyStates, long startTime, long endTime, boolean latestValues) {
-        super(serviceId, sessionId, subscriptionId, tenantId, entityId, TbSubscriptionType.TIMESERIES, updateConsumer);
+        super(serviceId, sessionId, subscriptionId, tenantId, entityId, TbSubscriptionType.TIMESERIES, updateProcessor);
         this.allKeys = allKeys;
         this.keyStates = keyStates;
         this.startTime = startTime;

application/src/main/java/org/thingsboard/server/service/telemetry/AbstractSubscriptionService.java

@@ -21,8 +21,11 @@ import com.google.common.util.concurrent.ListenableFuture;
 import lombok.extern.slf4j.Slf4j;
 import org.springframework.beans.factory.annotation.Autowired;
 import org.thingsboard.common.util.ThingsBoardThreadFactory;
+import org.thingsboard.server.common.data.id.EntityId;
+import org.thingsboard.server.common.data.id.TenantId;
 import org.thingsboard.server.common.msg.queue.ServiceType;
 import org.thingsboard.server.common.msg.queue.TopicPartitionInfo;
+import org.thingsboard.server.gen.transport.TransportProtos;
 import org.thingsboard.server.queue.discovery.event.PartitionChangeEvent;
 import org.thingsboard.server.queue.discovery.PartitionService;
 import org.thingsboard.server.queue.discovery.TbApplicationEventListener;
@@ -38,12 +41,13 @@ import java.util.concurrent.ConcurrentHashMap;
 import java.util.concurrent.ExecutorService;
 import java.util.concurrent.Executors;
 import java.util.function.Consumer;
+import java.util.function.Supplier;
 
 /**
  * Created by ashvayka on 27.03.18.
  */
 @Slf4j
-public abstract class AbstractSubscriptionService extends TbApplicationEventListener<PartitionChangeEvent>{
+public abstract class AbstractSubscriptionService extends TbApplicationEventListener<PartitionChangeEvent> {
 
     protected final Set<TopicPartitionInfo> currentPartitions = ConcurrentHashMap.newKeySet();
 
@@ -86,6 +90,22 @@ public abstract class AbstractSubscriptionService extends TbApplicationEventList
         }
     }
 
+    protected void forwardToSubscriptionManagerServiceOrSendToCore(TenantId tenantId, EntityId entityId,
+                                                                   Consumer<SubscriptionManagerService> toSubscriptionManagerService,
+                                                                   Supplier<TransportProtos.ToCoreMsg> toCore) {
+        TopicPartitionInfo tpi = partitionService.resolve(ServiceType.TB_CORE, tenantId, entityId);
+        if (currentPartitions.contains(tpi)) {
+            if (subscriptionManagerService.isPresent()) {
+                toSubscriptionManagerService.accept(subscriptionManagerService.get());
+            } else {
+                log.warn("Possible misconfiguration because subscriptionManagerService is null!");
+            }
+        } else {
+            TransportProtos.ToCoreMsg toCoreMsg = toCore.get();
+            clusterService.pushMsgToCore(tpi, entityId.getId(), toCoreMsg, null);
+        }
+    }
+
     protected <T> void addWsCallback(ListenableFuture<T> saveFuture, Consumer<T> callback) {
         Futures.addCallback(saveFuture, new FutureCallback<T>() {
             @Override

application/src/main/java/org/thingsboard/server/service/telemetry/DefaultAlarmSubscriptionService.java

@@ -164,17 +164,11 @@ public class DefaultAlarmSubscriptionService extends AbstractSubscriptionService
             Alarm alarm = result.getAlarm();
             TenantId tenantId = result.getAlarm().getTenantId();
             for (EntityId entityId : result.getPropagatedEntitiesList()) {
-                TopicPartitionInfo tpi = partitionService.resolve(ServiceType.TB_CORE, tenantId, entityId);
-                if (currentPartitions.contains(tpi)) {
-                    if (subscriptionManagerService.isPresent()) {
-                        subscriptionManagerService.get().onAlarmUpdate(tenantId, entityId, alarm, TbCallback.EMPTY);
-                    } else {
-                        log.warn("Possible misconfiguration because subscriptionManagerService is null!");
-                    }
-                } else {
-                    TransportProtos.ToCoreMsg toCoreMsg = TbSubscriptionUtils.toAlarmUpdateProto(tenantId, entityId, alarm);
-                    clusterService.pushMsgToCore(tpi, entityId.getId(), toCoreMsg, null);
-                }
+                forwardToSubscriptionManagerServiceOrSendToCore(tenantId, entityId, subscriptionManagerService -> {
+                    subscriptionManagerService.onAlarmUpdate(tenantId, entityId, alarm, TbCallback.EMPTY);
+                }, () -> {
+                    return TbSubscriptionUtils.toAlarmUpdateProto(tenantId, entityId, alarm);
+                });
             }
         });
     }
@@ -184,17 +178,11 @@ public class DefaultAlarmSubscriptionService extends AbstractSubscriptionService
             Alarm alarm = result.getAlarm();
             TenantId tenantId = result.getAlarm().getTenantId();
             for (EntityId entityId : result.getPropagatedEntitiesList()) {
-                TopicPartitionInfo tpi = partitionService.resolve(ServiceType.TB_CORE, tenantId, entityId);
-                if (currentPartitions.contains(tpi)) {
-                    if (subscriptionManagerService.isPresent()) {
-                        subscriptionManagerService.get().onAlarmDeleted(tenantId, entityId, alarm, TbCallback.EMPTY);
-                    } else {
-                        log.warn("Possible misconfiguration because subscriptionManagerService is null!");
-                    }
-                } else {
-                    TransportProtos.ToCoreMsg toCoreMsg = TbSubscriptionUtils.toAlarmDeletedProto(tenantId, entityId, alarm);
-                    clusterService.pushMsgToCore(tpi, entityId.getId(), toCoreMsg, null);
-                }
+                forwardToSubscriptionManagerServiceOrSendToCore(tenantId, entityId, subscriptionManagerService -> {
+                    subscriptionManagerService.onAlarmDeleted(tenantId, entityId, alarm, TbCallback.EMPTY);
+                }, () -> {
+                    return TbSubscriptionUtils.toAlarmDeletedProto(tenantId, entityId, alarm);
+                });
             }
         });
     }

application/src/main/java/org/thingsboard/server/service/telemetry/DefaultTelemetrySubscriptionService.java

@@ -40,12 +40,9 @@ import org.thingsboard.server.common.data.kv.LongDataEntry;
 import org.thingsboard.server.common.data.kv.StringDataEntry;
 import org.thingsboard.server.common.data.kv.TsKvEntry;
 import org.thingsboard.server.common.data.kv.TsKvLatestRemovingResult;
-import org.thingsboard.server.common.msg.queue.ServiceType;
 import org.thingsboard.server.common.msg.queue.TbCallback;
-import org.thingsboard.server.common.msg.queue.TopicPartitionInfo;
 import org.thingsboard.server.dao.attributes.AttributesService;
 import org.thingsboard.server.dao.timeseries.TimeseriesService;
-import org.thingsboard.server.gen.transport.TransportProtos;
 import org.thingsboard.server.queue.discovery.PartitionService;
 import org.thingsboard.server.queue.usagestats.TbApiUsageClient;
 import org.thingsboard.server.service.apiusage.TbApiUsageStateService;
@@ -369,73 +366,49 @@ public class DefaultTelemetrySubscriptionService extends AbstractSubscriptionSer
     }
 
     private void onAttributesUpdate(TenantId tenantId, EntityId entityId, String scope, List<AttributeKvEntry> attributes, boolean notifyDevice) {
-        TopicPartitionInfo tpi = partitionService.resolve(ServiceType.TB_CORE, tenantId, entityId);
-        if (currentPartitions.contains(tpi)) {
-            if (subscriptionManagerService.isPresent()) {
-                subscriptionManagerService.get().onAttributesUpdate(tenantId, entityId, scope, attributes, notifyDevice, TbCallback.EMPTY);
-            } else {
-                log.warn("Possible misconfiguration because subscriptionManagerService is null!");
-            }
-        } else {
-            TransportProtos.ToCoreMsg toCoreMsg = TbSubscriptionUtils.toAttributesUpdateProto(tenantId, entityId, scope, attributes);
-            clusterService.pushMsgToCore(tpi, entityId.getId(), toCoreMsg, null);
-        }
+        forwardToSubscriptionManagerServiceOrSendToCore(tenantId, entityId, subscriptionManagerService -> {
+            subscriptionManagerService.onAttributesUpdate(tenantId, entityId, scope, attributes, notifyDevice, TbCallback.EMPTY);
+        }, () -> {
+            return TbSubscriptionUtils.toAttributesUpdateProto(tenantId, entityId, scope, attributes);
+        });
     }
 
     private void onAttributesDelete(TenantId tenantId, EntityId entityId, String scope, List<String> keys) {
-        TopicPartitionInfo tpi = partitionService.resolve(ServiceType.TB_CORE, tenantId, entityId);
-        if (currentPartitions.contains(tpi)) {
-            if (subscriptionManagerService.isPresent()) {
-                subscriptionManagerService.get().onAttributesDelete(tenantId, entityId, scope, keys, TbCallback.EMPTY);
-            } else {
-                log.warn("Possible misconfiguration because subscriptionManagerService is null!");
-            }
-        } else {
-            TransportProtos.ToCoreMsg toCoreMsg = TbSubscriptionUtils.toAttributesDeleteProto(tenantId, entityId, scope, keys);
-            clusterService.pushMsgToCore(tpi, entityId.getId(), toCoreMsg, null);
-        }
+        forwardToSubscriptionManagerServiceOrSendToCore(tenantId, entityId, subscriptionManagerService -> {
+            subscriptionManagerService.onAttributesDelete(tenantId, entityId, scope, keys, TbCallback.EMPTY);
+        }, () -> {
+            return TbSubscriptionUtils.toAttributesDeleteProto(tenantId, entityId, scope, keys);
+        });
     }
 
     private void onTimeSeriesUpdate(TenantId tenantId, EntityId entityId, List<TsKvEntry> ts) {
-        TopicPartitionInfo tpi = partitionService.resolve(ServiceType.TB_CORE, tenantId, entityId);
-        if (currentPartitions.contains(tpi)) {
-            if (subscriptionManagerService.isPresent()) {
-                subscriptionManagerService.get().onTimeSeriesUpdate(tenantId, entityId, ts, TbCallback.EMPTY);
-            } else {
-                log.warn("Possible misconfiguration because subscriptionManagerService is null!");
-            }
-        } else {
-            TransportProtos.ToCoreMsg toCoreMsg = TbSubscriptionUtils.toTimeseriesUpdateProto(tenantId, entityId, ts);
-            clusterService.pushMsgToCore(tpi, entityId.getId(), toCoreMsg, null);
-        }
+        forwardToSubscriptionManagerServiceOrSendToCore(tenantId, entityId, subscriptionManagerService -> {
+            subscriptionManagerService.onTimeSeriesUpdate(tenantId, entityId, ts, TbCallback.EMPTY);
+        }, () -> {
+            return TbSubscriptionUtils.toTimeseriesUpdateProto(tenantId, entityId, ts);
+        });
     }
 
     private void onTimeSeriesDelete(TenantId tenantId, EntityId entityId, List<String> keys, List<TsKvLatestRemovingResult> ts) {
-        TopicPartitionInfo tpi = partitionService.resolve(ServiceType.TB_CORE, tenantId, entityId);
-        if (currentPartitions.contains(tpi)) {
-            if (subscriptionManagerService.isPresent()) {
-                List<TsKvEntry> updated = new ArrayList<>();
-                List<String> deleted = new ArrayList<>();
-
-                ts.stream().filter(Objects::nonNull).forEach(res -> {
-                    if (res.isRemoved()) {
-                        if (res.getData() != null) {
-                            updated.add(res.getData());
-                        } else {
-                            deleted.add(res.getKey());
-                        }
+        forwardToSubscriptionManagerServiceOrSendToCore(tenantId, entityId, subscriptionManagerService -> {
+            List<TsKvEntry> updated = new ArrayList<>();
+            List<String> deleted = new ArrayList<>();
+
+            ts.stream().filter(Objects::nonNull).forEach(res -> {
+                if (res.isRemoved()) {
+                    if (res.getData() != null) {
+                        updated.add(res.getData());
+                    } else {
+                        deleted.add(res.getKey());
                     }
-                });
+                }
+            });
 
-                subscriptionManagerService.get().onTimeSeriesUpdate(tenantId, entityId, updated, TbCallback.EMPTY);
-                subscriptionManagerService.get().onTimeSeriesDelete(tenantId, entityId, deleted, TbCallback.EMPTY);
-            } else {
-                log.warn("Possible misconfiguration because subscriptionManagerService is null!");
-            }
-        } else {
-            TransportProtos.ToCoreMsg toCoreMsg = TbSubscriptionUtils.toTimeseriesDeleteProto(tenantId, entityId, keys);
-            clusterService.pushMsgToCore(tpi, entityId.getId(), toCoreMsg, null);
-        }
+            subscriptionManagerService.onTimeSeriesUpdate(tenantId, entityId, updated, TbCallback.EMPTY);
+            subscriptionManagerService.onTimeSeriesDelete(tenantId, entityId, deleted, TbCallback.EMPTY);
+        }, () -> {
+            return TbSubscriptionUtils.toTimeseriesDeleteProto(tenantId, entityId, keys);
+        });
     }
 
     private <S> void addVoidCallback(ListenableFuture<S> saveFuture, final FutureCallback<Void> callback) {

application/src/main/java/org/thingsboard/server/service/telemetry/DefaultTelemetryWebSocketService.java → application/src/main/java/org/thingsboard/server/service/telemetry/DefaultWebSocketService.java

@@ -47,6 +47,7 @@ import org.thingsboard.server.dao.attributes.AttributesService;
 import org.thingsboard.server.dao.tenant.TbTenantProfileCache;
 import org.thingsboard.server.dao.timeseries.TimeseriesService;
 import org.thingsboard.server.dao.util.TenantRateLimitException;
+import org.thingsboard.server.exception.UnauthorizedException;
 import org.thingsboard.server.queue.discovery.TbServiceInfoProvider;
 import org.thingsboard.server.queue.util.TbCoreComponent;
 import org.thingsboard.server.service.security.AccessValidator;
@@ -55,26 +56,35 @@ import org.thingsboard.server.service.security.ValidationResult;
 import org.thingsboard.server.service.security.ValidationResultCode;
 import org.thingsboard.server.service.security.model.UserPrincipal;
 import org.thingsboard.server.service.security.permission.Operation;
+import org.thingsboard.server.service.subscription.SubscriptionErrorCode;
 import org.thingsboard.server.service.subscription.TbAttributeSubscription;
 import org.thingsboard.server.service.subscription.TbAttributeSubscriptionScope;
 import org.thingsboard.server.service.subscription.TbEntityDataSubscriptionService;
 import org.thingsboard.server.service.subscription.TbLocalSubscriptionService;
 import org.thingsboard.server.service.subscription.TbTimeseriesSubscription;
-import org.thingsboard.server.service.telemetry.cmd.TelemetryPluginCmdsWrapper;
-import org.thingsboard.server.service.telemetry.cmd.v1.AttributesSubscriptionCmd;
-import org.thingsboard.server.service.telemetry.cmd.v1.GetHistoryCmd;
-import org.thingsboard.server.service.telemetry.cmd.v1.SubscriptionCmd;
-import org.thingsboard.server.service.telemetry.cmd.v1.TelemetryPluginCmd;
-import org.thingsboard.server.service.telemetry.cmd.v1.TimeseriesSubscriptionCmd;
-import org.thingsboard.server.service.telemetry.cmd.v2.AlarmDataCmd;
-import org.thingsboard.server.service.telemetry.cmd.v2.CmdUpdate;
-import org.thingsboard.server.service.telemetry.cmd.v2.EntityCountCmd;
-import org.thingsboard.server.service.telemetry.cmd.v2.EntityDataCmd;
-import org.thingsboard.server.service.telemetry.cmd.v2.EntityDataUpdate;
-import org.thingsboard.server.service.telemetry.cmd.v2.UnsubscribeCmd;
-import org.thingsboard.server.service.telemetry.exception.UnauthorizedException;
-import org.thingsboard.server.service.telemetry.sub.SubscriptionErrorCode;
-import org.thingsboard.server.service.telemetry.sub.TelemetrySubscriptionUpdate;
+import org.thingsboard.server.service.ws.SessionEvent;
+import org.thingsboard.server.service.ws.WebSocketMsgEndpoint;
+import org.thingsboard.server.service.ws.WebSocketSessionRef;
+import org.thingsboard.server.service.ws.WsSessionMetaData;
+import org.thingsboard.server.service.ws.notification.cmd.NotificationCmdsWrapper;
+import org.thingsboard.server.service.ws.notification.cmd.MarkNotificationAsReadCmd;
+import org.thingsboard.server.service.ws.notification.cmd.NotificationsSubCmd;
+import org.thingsboard.server.service.ws.notification.cmd.NotificationsUnsubCmd;
+import org.thingsboard.server.service.ws.notification.sub.DefaultNotificationsSubscriptionService;
+import org.thingsboard.server.service.ws.telemetry.WebSocketService;
+import org.thingsboard.server.service.ws.telemetry.cmd.TelemetryPluginCmdsWrapper;
+import org.thingsboard.server.service.ws.telemetry.cmd.v1.AttributesSubscriptionCmd;
+import org.thingsboard.server.service.ws.telemetry.cmd.v1.GetHistoryCmd;
+import org.thingsboard.server.service.ws.telemetry.cmd.v1.SubscriptionCmd;
+import org.thingsboard.server.service.ws.telemetry.cmd.v1.TelemetryPluginCmd;
+import org.thingsboard.server.service.ws.telemetry.cmd.v1.TimeseriesSubscriptionCmd;
+import org.thingsboard.server.service.ws.telemetry.cmd.v2.AlarmDataCmd;
+import org.thingsboard.server.service.ws.telemetry.cmd.v2.CmdUpdate;
+import org.thingsboard.server.service.ws.telemetry.cmd.v2.EntityCountCmd;
+import org.thingsboard.server.service.ws.telemetry.cmd.v2.EntityDataCmd;
+import org.thingsboard.server.service.ws.telemetry.cmd.v2.EntityDataUpdate;
+import org.thingsboard.server.service.ws.telemetry.cmd.v2.UnsubscribeCmd;
+import org.thingsboard.server.service.ws.telemetry.sub.TelemetrySubscriptionUpdate;
 
 import javax.annotation.Nullable;
 import javax.annotation.PostConstruct;
@@ -103,7 +113,7 @@ import java.util.stream.Collectors;
 @Service
 @TbCoreComponent
 @Slf4j
-public class DefaultTelemetryWebSocketService implements TelemetryWebSocketService {
+public class DefaultWebSocketService implements WebSocketService {
 
     public static final int NUMBER_OF_PING_ATTEMPTS = 3;
 
@@ -126,7 +136,10 @@ public class DefaultTelemetryWebSocketService implements TelemetryWebSocketServi
     private TbEntityDataSubscriptionService entityDataSubService;
 
     @Autowired
-    private TelemetryWebSocketMsgEndpoint msgEndpoint;
+    private DefaultNotificationsSubscriptionService notificationsSubService;
+
+    @Autowired
+    private WebSocketMsgEndpoint msgEndpoint;
 
     @Autowired
     private AccessValidator accessValidator;
@@ -177,7 +190,7 @@ public class DefaultTelemetryWebSocketService implements TelemetryWebSocketServi
     }
 
     @Override
-    public void handleWebSocketSessionEvent(TelemetryWebSocketSessionRef sessionRef, SessionEvent event) {
+    public void handleWebSocketSessionEvent(WebSocketSessionRef sessionRef, SessionEvent event) {
         String sessionId = sessionRef.getSessionId();
         log.debug(PROCESSING_MSG, sessionId, event);
         switch (event.getEventType()) {
@@ -197,49 +210,19 @@ public class DefaultTelemetryWebSocketService implements TelemetryWebSocketServi
     }
 
     @Override
-    public void handleWebSocketMsg(TelemetryWebSocketSessionRef sessionRef, String msg) {
+    public void handleWebSocketMsg(WebSocketSessionRef sessionRef, String msg) {
         if (log.isTraceEnabled()) {
             log.trace("[{}] Processing: {}", sessionRef.getSessionId(), msg);
         }
 
         try {
-            TelemetryPluginCmdsWrapper cmdsWrapper = jsonMapper.readValue(msg, TelemetryPluginCmdsWrapper.class);
-            if (cmdsWrapper != null) {
-                if (cmdsWrapper.getAttrSubCmds() != null) {
-                    cmdsWrapper.getAttrSubCmds().forEach(cmd -> {
-                        if (processSubscription(sessionRef, cmd)) {
-                            handleWsAttributesSubscriptionCmd(sessionRef, cmd);
-                        }
-                    });
-                }
-                if (cmdsWrapper.getTsSubCmds() != null) {
-                    cmdsWrapper.getTsSubCmds().forEach(cmd -> {
-                        if (processSubscription(sessionRef, cmd)) {
-                            handleWsTimeseriesSubscriptionCmd(sessionRef, cmd);
-                        }
-                    });
-                }
-                if (cmdsWrapper.getHistoryCmds() != null) {
-                    cmdsWrapper.getHistoryCmds().forEach(cmd -> handleWsHistoryCmd(sessionRef, cmd));
-                }
-                if (cmdsWrapper.getEntityDataCmds() != null) {
-                    cmdsWrapper.getEntityDataCmds().forEach(cmd -> handleWsEntityDataCmd(sessionRef, cmd));
-                }
-                if (cmdsWrapper.getAlarmDataCmds() != null) {
-                    cmdsWrapper.getAlarmDataCmds().forEach(cmd -> handleWsAlarmDataCmd(sessionRef, cmd));
-                }
-                if (cmdsWrapper.getEntityCountCmds() != null) {
-                    cmdsWrapper.getEntityCountCmds().forEach(cmd -> handleWsEntityCountCmd(sessionRef, cmd));
-                }
-                if (cmdsWrapper.getEntityDataUnsubscribeCmds() != null) {
-                    cmdsWrapper.getEntityDataUnsubscribeCmds().forEach(cmd -> handleWsDataUnsubscribeCmd(sessionRef, cmd));
-                }
-                if (cmdsWrapper.getAlarmDataUnsubscribeCmds() != null) {
-                    cmdsWrapper.getAlarmDataUnsubscribeCmds().forEach(cmd -> handleWsDataUnsubscribeCmd(sessionRef, cmd));
-                }
-                if (cmdsWrapper.getEntityCountUnsubscribeCmds() != null) {
-                    cmdsWrapper.getEntityCountUnsubscribeCmds().forEach(cmd -> handleWsDataUnsubscribeCmd(sessionRef, cmd));
-                }
+            switch (sessionRef.getSessionType()) {
+                case TELEMETRY:
+                    processTelemetryCmds(sessionRef, msg);
+                    break;
+                case NOTIFICATIONS:
+                    processNotificationCmds(sessionRef, msg);
+                    break;
             }
         } catch (IOException e) {
             log.warn("Failed to decode subscription cmd: {}", e.getMessage(), e);
@@ -247,7 +230,81 @@ public class DefaultTelemetryWebSocketService implements TelemetryWebSocketServi
         }
     }
 
-    private void handleWsEntityDataCmd(TelemetryWebSocketSessionRef sessionRef, EntityDataCmd cmd) {
+    private void processTelemetryCmds(WebSocketSessionRef sessionRef, String msg) throws JsonProcessingException {
+        TelemetryPluginCmdsWrapper cmdsWrapper = jsonMapper.readValue(msg, TelemetryPluginCmdsWrapper.class);
+        if (cmdsWrapper == null) {
+            return;
+        }
+        if (cmdsWrapper.getAttrSubCmds() != null) {
+            cmdsWrapper.getAttrSubCmds().forEach(cmd -> {
+                if (processSubscription(sessionRef, cmd)) {
+                    handleWsAttributesSubscriptionCmd(sessionRef, cmd);
+                }
+            });
+        }
+        if (cmdsWrapper.getTsSubCmds() != null) {
+            cmdsWrapper.getTsSubCmds().forEach(cmd -> {
+                if (processSubscription(sessionRef, cmd)) {
+                    handleWsTimeseriesSubscriptionCmd(sessionRef, cmd);
+                }
+            });
+        }
+        if (cmdsWrapper.getHistoryCmds() != null) {
+            cmdsWrapper.getHistoryCmds().forEach(cmd -> handleWsHistoryCmd(sessionRef, cmd));
+        }
+        if (cmdsWrapper.getEntityDataCmds() != null) {
+            cmdsWrapper.getEntityDataCmds().forEach(cmd -> handleWsEntityDataCmd(sessionRef, cmd));
+        }
+        if (cmdsWrapper.getAlarmDataCmds() != null) {
+            cmdsWrapper.getAlarmDataCmds().forEach(cmd -> handleWsAlarmDataCmd(sessionRef, cmd));
+        }
+        if (cmdsWrapper.getEntityCountCmds() != null) {
+            cmdsWrapper.getEntityCountCmds().forEach(cmd -> handleWsEntityCountCmd(sessionRef, cmd));
+        }
+        if (cmdsWrapper.getEntityDataUnsubscribeCmds() != null) {
+            cmdsWrapper.getEntityDataUnsubscribeCmds().forEach(cmd -> handleWsDataUnsubscribeCmd(sessionRef, cmd));
+        }
+        if (cmdsWrapper.getAlarmDataUnsubscribeCmds() != null) {
+            cmdsWrapper.getAlarmDataUnsubscribeCmds().forEach(cmd -> handleWsDataUnsubscribeCmd(sessionRef, cmd));
+        }
+        if (cmdsWrapper.getEntityCountUnsubscribeCmds() != null) {
+            cmdsWrapper.getEntityCountUnsubscribeCmds().forEach(cmd -> handleWsDataUnsubscribeCmd(sessionRef, cmd));
+        }
+    }
+
+    private void processNotificationCmds(WebSocketSessionRef sessionRef, String msg) throws IOException {
+        NotificationCmdsWrapper cmdsWrapper = jsonMapper.readValue(msg, NotificationCmdsWrapper.class);
+        if (cmdsWrapper.getUnreadSubCmd() != null) {
+            handleUnreadNotificationsSubCmd(sessionRef, cmdsWrapper.getUnreadSubCmd());
+        } else if (cmdsWrapper.getUnreadUnsubCmd() != null) {
+            handleUnreadNotificationsUnsubCmd(sessionRef, cmdsWrapper.getUnreadUnsubCmd());
+        } else if (cmdsWrapper.getMarkAsReadCmd() != null) {
+            handleMarkNotificationAsReadCmd(sessionRef, cmdsWrapper.getMarkAsReadCmd());
+        }
+    }
+
+    private void handleUnreadNotificationsSubCmd(WebSocketSessionRef sessionRef, NotificationsSubCmd cmd) {
+        String sessionId = sessionRef.getSessionId();
+        if (validateSessionMetadata(sessionRef, cmd.getCmdId(), sessionId)) {
+            notificationsSubService.handleUnreadNotificationsSubCmd(sessionRef, cmd);
+        }
+    }
+
+    private void handleUnreadNotificationsUnsubCmd(WebSocketSessionRef sessionRef, NotificationsUnsubCmd cmd) {
+        String sessionId = sessionRef.getSessionId();
+        if (validateSessionMetadata(sessionRef, cmd.getCmdId(), sessionId)) {
+            notificationsSubService.handleUnsubCmd(sessionRef, cmd);
+        }
+    }
+
+    private void handleMarkNotificationAsReadCmd(WebSocketSessionRef sessionRef, MarkNotificationAsReadCmd cmd) {
+        String sessionId = sessionRef.getSessionId();
+        if (validateSessionMetadata(sessionRef, cmd.getCmdId(), sessionId)) {
+            notificationsSubService.handleMarkAsReadCmd(sessionRef, cmd);
+        }
+    }
+
+    private void handleWsEntityDataCmd(WebSocketSessionRef sessionRef, EntityDataCmd cmd) {
         String sessionId = sessionRef.getSessionId();
         log.debug("[{}] Processing: {}", sessionId, cmd);
 
@@ -257,7 +314,7 @@ public class DefaultTelemetryWebSocketService implements TelemetryWebSocketServi
         }
     }
 
-    private void handleWsEntityCountCmd(TelemetryWebSocketSessionRef sessionRef, EntityCountCmd cmd) {
+    private void handleWsEntityCountCmd(WebSocketSessionRef sessionRef, EntityCountCmd cmd) {
         String sessionId = sessionRef.getSessionId();
         log.debug("[{}] Processing: {}", sessionId, cmd);
 
@@ -267,7 +324,7 @@ public class DefaultTelemetryWebSocketService implements TelemetryWebSocketServi
         }
     }
 
-    private void handleWsAlarmDataCmd(TelemetryWebSocketSessionRef sessionRef, AlarmDataCmd cmd) {
+    private void handleWsAlarmDataCmd(WebSocketSessionRef sessionRef, AlarmDataCmd cmd) {
         String sessionId = sessionRef.getSessionId();
         log.debug("[{}] Processing: {}", sessionId, cmd);
 
@@ -277,7 +334,7 @@ public class DefaultTelemetryWebSocketService implements TelemetryWebSocketServi
         }
     }
 
-    private void handleWsDataUnsubscribeCmd(TelemetryWebSocketSessionRef sessionRef, UnsubscribeCmd cmd) {
+    private void handleWsDataUnsubscribeCmd(WebSocketSessionRef sessionRef, UnsubscribeCmd cmd) {
         String sessionId = sessionRef.getSessionId();
         log.debug("[{}] Processing: {}", sessionId, cmd);
 
@@ -315,7 +372,7 @@ public class DefaultTelemetryWebSocketService implements TelemetryWebSocketServi
         }
     }
 
-    private void processSessionClose(TelemetryWebSocketSessionRef sessionRef) {
+    private void processSessionClose(WebSocketSessionRef sessionRef) {
         var tenantProfileConfiguration = tenantProfileCache.get(sessionRef.getSecurityCtx().getTenantId()).getDefaultProfileConfiguration();
         if (tenantProfileConfiguration != null) {
             String sessionId = "[" + sessionRef.getSessionId() + "]";
@@ -349,7 +406,7 @@ public class DefaultTelemetryWebSocketService implements TelemetryWebSocketServi
         }
     }
 
-    private boolean processSubscription(TelemetryWebSocketSessionRef sessionRef, SubscriptionCmd cmd) {
+    private boolean processSubscription(WebSocketSessionRef sessionRef, SubscriptionCmd cmd) {
         var tenantProfileConfiguration = (DefaultTenantProfileConfiguration) tenantProfileCache.get(sessionRef.getSecurityCtx().getTenantId()).getDefaultProfileConfiguration();
 
         String subId = "[" + sessionRef.getSessionId() + "]:[" + cmd.getCmdId() + "]";
@@ -420,7 +477,7 @@ public class DefaultTelemetryWebSocketService implements TelemetryWebSocketServi
         return true;
     }
 
-    private void handleWsAttributesSubscriptionCmd(TelemetryWebSocketSessionRef sessionRef, AttributesSubscriptionCmd cmd) {
+    private void handleWsAttributesSubscriptionCmd(WebSocketSessionRef sessionRef, AttributesSubscriptionCmd cmd) {
         String sessionId = sessionRef.getSessionId();
         log.debug("[{}] Processing: {}", sessionId, cmd);
 
@@ -441,7 +498,7 @@ public class DefaultTelemetryWebSocketService implements TelemetryWebSocketServi
         }
     }
 
-    private void handleWsAttributesSubscriptionByKeys(TelemetryWebSocketSessionRef sessionRef,
+    private void handleWsAttributesSubscriptionByKeys(WebSocketSessionRef sessionRef,
                                                       AttributesSubscriptionCmd cmd, String sessionId, EntityId entityId,
                                                       List<String> keys) {
         FutureCallback<List<AttributeKvEntry>> callback = new FutureCallback<>() {
@@ -465,7 +522,7 @@ public class DefaultTelemetryWebSocketService implements TelemetryWebSocketServi
                         .allKeys(false)
                         .keyStates(subState)
                         .scope(scope)
-                        .updateConsumer(DefaultTelemetryWebSocketService.this::sendWsMsg)
+                        .updateProcessor((subscription, update) -> sendWsMsg(subscription.getSessionId(), update))
                         .build();
                 oldSubService.addSubscription(sub);
             }
@@ -492,7 +549,7 @@ public class DefaultTelemetryWebSocketService implements TelemetryWebSocketServi
         }
     }
 
-    private void handleWsHistoryCmd(TelemetryWebSocketSessionRef sessionRef, GetHistoryCmd cmd) {
+    private void handleWsHistoryCmd(WebSocketSessionRef sessionRef, GetHistoryCmd cmd) {
         String sessionId = sessionRef.getSessionId();
         WsSessionMetaData sessionMD = wsSessionsMap.get(sessionId);
         if (sessionMD == null) {
@@ -542,7 +599,7 @@ public class DefaultTelemetryWebSocketService implements TelemetryWebSocketServi
                 on(r -> Futures.addCallback(tsService.findAll(sessionRef.getSecurityCtx().getTenantId(), entityId, queries), callback, executor), callback::onFailure));
     }
 
-    private void handleWsAttributesSubscription(TelemetryWebSocketSessionRef sessionRef,
+    private void handleWsAttributesSubscription(WebSocketSessionRef sessionRef,
                                                 AttributesSubscriptionCmd cmd, String sessionId, EntityId entityId) {
         FutureCallback<List<AttributeKvEntry>> callback = new FutureCallback<>() {
             @Override
@@ -563,7 +620,7 @@ public class DefaultTelemetryWebSocketService implements TelemetryWebSocketServi
                         .entityId(entityId)
                         .allKeys(true)
                         .keyStates(subState)
-                        .updateConsumer(DefaultTelemetryWebSocketService.this::sendWsMsg)
+                        .updateProcessor((subscription, update) -> sendWsMsg(subscription.getSessionId(), update))
                         .scope(scope).build();
                 oldSubService.addSubscription(sub);
             }
@@ -585,7 +642,7 @@ public class DefaultTelemetryWebSocketService implements TelemetryWebSocketServi
         }
     }
 
-    private void handleWsTimeseriesSubscriptionCmd(TelemetryWebSocketSessionRef sessionRef, TimeseriesSubscriptionCmd cmd) {
+    private void handleWsTimeseriesSubscriptionCmd(WebSocketSessionRef sessionRef, TimeseriesSubscriptionCmd cmd) {
         String sessionId = sessionRef.getSessionId();
         log.debug("[{}] Processing: {}", sessionId, cmd);
 
@@ -605,7 +662,7 @@ public class DefaultTelemetryWebSocketService implements TelemetryWebSocketServi
         }
     }
 
-    private void handleWsTimeseriesSubscriptionByKeys(TelemetryWebSocketSessionRef sessionRef,
+    private void handleWsTimeseriesSubscriptionByKeys(WebSocketSessionRef sessionRef,
                                                       TimeseriesSubscriptionCmd cmd, String sessionId, EntityId entityId) {
         long startTs;
         if (cmd.getTimeWindow() > 0) {
@@ -629,7 +686,7 @@ public class DefaultTelemetryWebSocketService implements TelemetryWebSocketServi
         }
     }
 
-    private void handleWsTimeseriesSubscription(TelemetryWebSocketSessionRef sessionRef,
+    private void handleWsTimeseriesSubscription(WebSocketSessionRef sessionRef,
                                                 TimeseriesSubscriptionCmd cmd, String sessionId, EntityId entityId) {
         FutureCallback<List<TsKvEntry>> callback = new FutureCallback<List<TsKvEntry>>() {
             @Override
@@ -644,7 +701,7 @@ public class DefaultTelemetryWebSocketService implements TelemetryWebSocketServi
                         .subscriptionId(cmd.getCmdId())
                         .tenantId(sessionRef.getSecurityCtx().getTenantId())
                         .entityId(entityId)
-                        .updateConsumer(DefaultTelemetryWebSocketService.this::sendWsMsg)
+                        .updateProcessor((subscription, update) -> sendWsMsg(subscription.getSessionId(), update))
                         .allKeys(true)
                         .keyStates(subState).build();
                 oldSubService.addSubscription(sub);
@@ -667,7 +724,7 @@ public class DefaultTelemetryWebSocketService implements TelemetryWebSocketServi
                 on(r -> Futures.addCallback(tsService.findAllLatest(sessionRef.getSecurityCtx().getTenantId(), entityId), callback, executor), callback::onFailure));
     }
 
-    private FutureCallback<List<TsKvEntry>> getSubscriptionCallback(final TelemetryWebSocketSessionRef sessionRef, final TimeseriesSubscriptionCmd cmd, final String sessionId, final EntityId entityId, final long startTs, final List<String> keys) {
+    private FutureCallback<List<TsKvEntry>> getSubscriptionCallback(final WebSocketSessionRef sessionRef, final TimeseriesSubscriptionCmd cmd, final String sessionId, final EntityId entityId, final long startTs, final List<String> keys) {
         return new FutureCallback<>() {
             @Override
             public void onSuccess(List<TsKvEntry> data) {
@@ -682,7 +739,7 @@ public class DefaultTelemetryWebSocketService implements TelemetryWebSocketServi
                         .subscriptionId(cmd.getCmdId())
                         .tenantId(sessionRef.getSecurityCtx().getTenantId())
                         .entityId(entityId)
-                        .updateConsumer(DefaultTelemetryWebSocketService.this::sendWsMsg)
+                        .updateProcessor((subscription, update) -> sendWsMsg(subscription.getSessionId(), update))
                         .allKeys(false)
                         .keyStates(subState).build();
                 oldSubService.addSubscription(sub);
@@ -702,7 +759,7 @@ public class DefaultTelemetryWebSocketService implements TelemetryWebSocketServi
         };
     }
 
-    private void unsubscribe(TelemetryWebSocketSessionRef sessionRef, SubscriptionCmd cmd, String sessionId) {
+    private void unsubscribe(WebSocketSessionRef sessionRef, SubscriptionCmd cmd, String sessionId) {
         if (cmd.getEntityId() == null || cmd.getEntityId().isEmpty()) {
             oldSubService.cancelAllSessionSubscriptions(sessionId);
         } else {
@@ -710,7 +767,7 @@ public class DefaultTelemetryWebSocketService implements TelemetryWebSocketServi
         }
     }
 
-    private boolean validateSubscriptionCmd(TelemetryWebSocketSessionRef sessionRef, EntityDataCmd cmd) {
+    private boolean validateSubscriptionCmd(WebSocketSessionRef sessionRef, EntityDataCmd cmd) {
         if (cmd.getCmdId() < 0) {
             TelemetrySubscriptionUpdate update = new TelemetrySubscriptionUpdate(cmd.getCmdId(), SubscriptionErrorCode.BAD_REQUEST,
                     "Cmd id is negative value!");
@@ -725,7 +782,7 @@ public class DefaultTelemetryWebSocketService implements TelemetryWebSocketServi
         return true;
     }
 
-    private boolean validateSubscriptionCmd(TelemetryWebSocketSessionRef sessionRef, EntityCountCmd cmd) {
+    private boolean validateSubscriptionCmd(WebSocketSessionRef sessionRef, EntityCountCmd cmd) {
         if (cmd.getCmdId() < 0) {
             TelemetrySubscriptionUpdate update = new TelemetrySubscriptionUpdate(cmd.getCmdId(), SubscriptionErrorCode.BAD_REQUEST,
                     "Cmd id is negative value!");
@@ -739,7 +796,7 @@ public class DefaultTelemetryWebSocketService implements TelemetryWebSocketServi
         return true;
     }
 
-    private boolean validateSubscriptionCmd(TelemetryWebSocketSessionRef sessionRef, AlarmDataCmd cmd) {
+    private boolean validateSubscriptionCmd(WebSocketSessionRef sessionRef, AlarmDataCmd cmd) {
         if (cmd.getCmdId() < 0) {
             TelemetrySubscriptionUpdate update = new TelemetrySubscriptionUpdate(cmd.getCmdId(), SubscriptionErrorCode.BAD_REQUEST,
                     "Cmd id is negative value!");
@@ -754,7 +811,7 @@ public class DefaultTelemetryWebSocketService implements TelemetryWebSocketServi
         return true;
     }
 
-    private boolean validateSubscriptionCmd(TelemetryWebSocketSessionRef sessionRef, SubscriptionCmd cmd) {
+    private boolean validateSubscriptionCmd(WebSocketSessionRef sessionRef, SubscriptionCmd cmd) {
         if (cmd.getEntityId() == null || cmd.getEntityId().isEmpty()) {
             TelemetrySubscriptionUpdate update = new TelemetrySubscriptionUpdate(cmd.getCmdId(), SubscriptionErrorCode.BAD_REQUEST,
                     "Device id is empty!");
@@ -764,11 +821,11 @@ public class DefaultTelemetryWebSocketService implements TelemetryWebSocketServi
         return true;
     }
 
-    private boolean validateSessionMetadata(TelemetryWebSocketSessionRef sessionRef, SubscriptionCmd cmd, String sessionId) {
+    private boolean validateSessionMetadata(WebSocketSessionRef sessionRef, SubscriptionCmd cmd, String sessionId) {
         return validateSessionMetadata(sessionRef, cmd.getCmdId(), sessionId);
     }
 
-    private boolean validateSessionMetadata(TelemetryWebSocketSessionRef sessionRef, int cmdId, String sessionId) {
+    private boolean validateSessionMetadata(WebSocketSessionRef sessionRef, int cmdId, String sessionId) {
         WsSessionMetaData sessionMD = wsSessionsMap.get(sessionId);
         if (sessionMD == null) {
             log.warn("[{}] Session meta data not found. ", sessionId);
@@ -781,15 +838,15 @@ public class DefaultTelemetryWebSocketService implements TelemetryWebSocketServi
         }
     }
 
-    private void sendWsMsg(TelemetryWebSocketSessionRef sessionRef, EntityDataUpdate update) {
+    private void sendWsMsg(WebSocketSessionRef sessionRef, EntityDataUpdate update) {
         sendWsMsg(sessionRef, update.getCmdId(), update);
     }
 
-    private void sendWsMsg(TelemetryWebSocketSessionRef sessionRef, TelemetrySubscriptionUpdate update) {
+    private void sendWsMsg(WebSocketSessionRef sessionRef, TelemetrySubscriptionUpdate update) {
         sendWsMsg(sessionRef, update.getSubscriptionId(), update);
     }
 
-    private void sendWsMsg(TelemetryWebSocketSessionRef sessionRef, int cmdId, Object update) {
+    private void sendWsMsg(WebSocketSessionRef sessionRef, int cmdId, Object update) {
         try {
             String msg = jsonMapper.writeValueAsString(update);
             executor.submit(() -> {

application/src/main/java/org/thingsboard/server/service/telemetry/InternalTelemetryService.java

@@ -41,6 +41,4 @@ public interface InternalTelemetryService extends RuleEngineTelemetryService {
 
     void deleteLatestInternal(TenantId tenantId, EntityId entityId, List<String> keys, FutureCallback<Void> callback);
 
-
-
 }

application/src/main/java/org/thingsboard/server/service/telemetry/SessionEvent.java → application/src/main/java/org/thingsboard/server/service/ws/SessionEvent.java

@@ -13,7 +13,7 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-package org.thingsboard.server.service.telemetry;
+package org.thingsboard.server.service.ws;
 
 import lombok.Getter;
 import lombok.ToString;

application/src/main/java/org/thingsboard/server/service/telemetry/TelemetryWebSocketMsgEndpoint.java → application/src/main/java/org/thingsboard/server/service/ws/WebSocketMsgEndpoint.java

@@ -13,20 +13,21 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-package org.thingsboard.server.service.telemetry;
+package org.thingsboard.server.service.ws;
 
 import org.springframework.web.socket.CloseStatus;
+import org.thingsboard.server.service.ws.WebSocketSessionRef;
 
 import java.io.IOException;
 
 /**
  * Created by ashvayka on 27.03.18.
  */
-public interface TelemetryWebSocketMsgEndpoint {
+public interface WebSocketMsgEndpoint {
 
-    void send(TelemetryWebSocketSessionRef sessionRef, int subscriptionId, String msg) throws IOException;
+    void send(WebSocketSessionRef sessionRef, int subscriptionId, String msg) throws IOException;
 
-    void sendPing(TelemetryWebSocketSessionRef sessionRef, long currentTime) throws IOException;
+    void sendPing(WebSocketSessionRef sessionRef, long currentTime) throws IOException;
 
-    void close(TelemetryWebSocketSessionRef sessionRef, CloseStatus withReason) throws IOException;
+    void close(WebSocketSessionRef sessionRef, CloseStatus withReason) throws IOException;
 }

application/src/main/java/org/thingsboard/server/service/telemetry/TelemetryWebSocketSessionRef.java → application/src/main/java/org/thingsboard/server/service/ws/WebSocketSessionRef.java

@@ -13,9 +13,11 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-package org.thingsboard.server.service.telemetry;
+package org.thingsboard.server.service.ws;
 
+import lombok.Builder;
 import lombok.Getter;
+import lombok.RequiredArgsConstructor;
 import org.thingsboard.server.service.security.model.SecurityUser;
 
 import java.net.InetSocketAddress;
@@ -25,34 +27,25 @@ import java.util.concurrent.atomic.AtomicInteger;
 /**
  * Created by ashvayka on 27.03.18.
  */
-public class TelemetryWebSocketSessionRef {
+@RequiredArgsConstructor
+@Builder
+@Getter
+public class WebSocketSessionRef {
 
     private static final long serialVersionUID = 1L;
 
-    @Getter
     private final String sessionId;
-    @Getter
     private final SecurityUser securityCtx;
-    @Getter
     private final InetSocketAddress localAddress;
-    @Getter
     private final InetSocketAddress remoteAddress;
-    @Getter
-    private final AtomicInteger sessionSubIdSeq;
-
-    public TelemetryWebSocketSessionRef(String sessionId, SecurityUser securityCtx, InetSocketAddress localAddress, InetSocketAddress remoteAddress) {
-        this.sessionId = sessionId;
-        this.securityCtx = securityCtx;
-        this.localAddress = localAddress;
-        this.remoteAddress = remoteAddress;
-        this.sessionSubIdSeq = new AtomicInteger();
-    }
+    private final WebSocketSessionType sessionType;
+    private final AtomicInteger sessionSubIdSeq = new AtomicInteger();
 
     @Override
     public boolean equals(Object o) {
         if (this == o) return true;
         if (o == null || getClass() != o.getClass()) return false;
-        TelemetryWebSocketSessionRef that = (TelemetryWebSocketSessionRef) o;
+        WebSocketSessionRef that = (WebSocketSessionRef) o;
         return Objects.equals(sessionId, that.sessionId);
     }
 
@@ -63,10 +56,11 @@ public class TelemetryWebSocketSessionRef {
 
     @Override
     public String toString() {
-        return "TelemetryWebSocketSessionRef{" +
+        return "WebSocketSessionRef{" +
                 "sessionId='" + sessionId + '\'' +
                 ", localAddress=" + localAddress +
                 ", remoteAddress=" + remoteAddress +
+                ", sessionType=" + sessionType +
                 '}';
     }
 }

application/src/main/java/org/thingsboard/server/service/ws/WebSocketSessionType.java

@@ -0,0 +1,38 @@
+/**
+ * Copyright © 2016-2022 The Thingsboard Authors
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.thingsboard.server.service.ws;
+
+import lombok.Getter;
+import lombok.RequiredArgsConstructor;
+
+import java.util.Arrays;
+import java.util.Optional;
+
+@RequiredArgsConstructor
+@Getter
+public enum WebSocketSessionType {
+    TELEMETRY("telemetry"),
+    NOTIFICATIONS("notifications");
+
+    private final String name;
+
+    public static Optional<WebSocketSessionType> forName(String name) {
+        return Arrays.stream(values())
+                .filter(sessionType -> sessionType.getName().equals(name))
+                .findFirst();
+    }
+
+}

application/src/main/java/org/thingsboard/server/service/telemetry/WsSessionMetaData.java → application/src/main/java/org/thingsboard/server/service/ws/WsSessionMetaData.java

@@ -13,27 +13,27 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-package org.thingsboard.server.service.telemetry;
+package org.thingsboard.server.service.ws;
 
 
 /**
  * Created by ashvayka on 27.03.18.
  */
 public class WsSessionMetaData {
-    private TelemetryWebSocketSessionRef sessionRef;
+    private WebSocketSessionRef sessionRef;
     private long lastActivityTime;
 
-    public WsSessionMetaData(TelemetryWebSocketSessionRef sessionRef) {
+    public WsSessionMetaData(WebSocketSessionRef sessionRef) {
         super();
         this.sessionRef = sessionRef;
         this.lastActivityTime = System.currentTimeMillis();
     }
 
-    public TelemetryWebSocketSessionRef getSessionRef() {
+    public WebSocketSessionRef getSessionRef() {
         return sessionRef;
     }
 
-    public void setSessionRef(TelemetryWebSocketSessionRef sessionRef) {
+    public void setSessionRef(WebSocketSessionRef sessionRef) {
         this.sessionRef = sessionRef;
     }
 

application/src/main/java/org/thingsboard/server/service/ws/notification/cmd/MarkNotificationAsReadCmd.java

@@ -0,0 +1,30 @@
+/**
+ * Copyright © 2016-2022 The Thingsboard Authors
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.thingsboard.server.service.ws.notification.cmd;
+
+import lombok.AllArgsConstructor;
+import lombok.Data;
+import lombok.NoArgsConstructor;
+
+import java.util.UUID;
+
+@Data
+@NoArgsConstructor
+@AllArgsConstructor
+public class MarkNotificationAsReadCmd {
+    private int cmdId;
+    private UUID notificationId;
+}

application/src/main/java/org/thingsboard/server/service/ws/notification/cmd/NotificationCmdsWrapper.java

@@ -0,0 +1,28 @@
+/**
+ * Copyright © 2016-2022 The Thingsboard Authors
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.thingsboard.server.service.ws.notification.cmd;
+
+import lombok.Data;
+import org.thingsboard.server.service.ws.notification.cmd.MarkNotificationAsReadCmd;
+import org.thingsboard.server.service.ws.notification.cmd.NotificationsSubCmd;
+
+@Data
+public class NotificationCmdsWrapper {
+    private NotificationsSubCmd unreadSubCmd;
+    private NotificationsUnsubCmd unreadUnsubCmd;
+
+    private MarkNotificationAsReadCmd markAsReadCmd;
+}

application/src/main/java/org/thingsboard/server/service/ws/notification/cmd/NotificationsSubCmd.java

@@ -0,0 +1,28 @@
+/**
+ * Copyright © 2016-2022 The Thingsboard Authors
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.thingsboard.server.service.ws.notification.cmd;
+
+import lombok.AllArgsConstructor;
+import lombok.Data;
+import lombok.NoArgsConstructor;
+
+@Data
+@NoArgsConstructor
+@AllArgsConstructor
+public class NotificationsSubCmd {
+    private int cmdId;
+    private int limit;
+}

application/src/main/java/org/thingsboard/server/service/ws/notification/cmd/NotificationsUnsubCmd.java

@@ -0,0 +1,24 @@
+/**
+ * Copyright © 2016-2022 The Thingsboard Authors
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.thingsboard.server.service.ws.notification.cmd;
+
+import lombok.Data;
+import org.thingsboard.server.service.ws.telemetry.cmd.v2.UnsubscribeCmd;
+
+@Data
+public class NotificationsUnsubCmd implements UnsubscribeCmd {
+    private int cmdId;
+}

application/src/main/java/org/thingsboard/server/service/ws/notification/cmd/UnreadNotificationsUpdate.java

@@ -0,0 +1,54 @@
+/**
+ * Copyright © 2016-2022 The Thingsboard Authors
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.thingsboard.server.service.ws.notification.cmd;
+
+import com.fasterxml.jackson.annotation.JsonCreator;
+import com.fasterxml.jackson.annotation.JsonProperty;
+import lombok.Builder;
+import lombok.Getter;
+import org.thingsboard.server.common.data.notification.Notification;
+import org.thingsboard.server.service.ws.telemetry.cmd.v2.CmdUpdate;
+import org.thingsboard.server.service.ws.telemetry.cmd.v2.CmdUpdateType;
+
+import java.util.Collection;
+import java.util.List;
+
+@Getter
+public class UnreadNotificationsUpdate extends CmdUpdate {
+
+    private final Collection<Notification> notifications;
+    private final Notification update;
+    private final int totalUnreadCount;
+
+    @Builder
+    @JsonCreator
+    public UnreadNotificationsUpdate(@JsonProperty("cmdId") int cmdId, @JsonProperty("errorCode") int errorCode,
+                                     @JsonProperty("errorMsg") String errorMsg,
+                                     @JsonProperty("notifications") Collection<Notification> notifications,
+                                     @JsonProperty("update") Notification update,
+                                     @JsonProperty("totalUnreadCount") int totalUnreadCount) {
+        super(cmdId, errorCode, errorMsg);
+        this.notifications = notifications;
+        this.update = update;
+        this.totalUnreadCount = totalUnreadCount;
+    }
+
+    @Override
+    public CmdUpdateType getCmdUpdateType() {
+        return CmdUpdateType.NOTIFICATIONS;
+    }
+
+}

application/src/main/java/org/thingsboard/server/service/ws/notification/sub/DefaultNotificationsSubscriptionService.java

@@ -0,0 +1,183 @@
+/**
+ * Copyright © 2016-2022 The Thingsboard Authors
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.thingsboard.server.service.ws.notification.sub;
+
+import lombok.extern.slf4j.Slf4j;
+import org.springframework.context.annotation.Lazy;
+import org.springframework.stereotype.Service;
+import org.thingsboard.server.cluster.TbClusterService;
+import org.thingsboard.server.common.data.id.IdBased;
+import org.thingsboard.server.common.data.id.NotificationId;
+import org.thingsboard.server.common.data.id.NotificationRequestId;
+import org.thingsboard.server.common.data.id.TenantId;
+import org.thingsboard.server.common.data.id.UserId;
+import org.thingsboard.server.common.data.notification.Notification;
+import org.thingsboard.server.common.data.notification.NotificationStatus;
+import org.thingsboard.server.common.data.page.PageData;
+import org.thingsboard.server.common.msg.queue.ServiceType;
+import org.thingsboard.server.common.msg.queue.TbCallback;
+import org.thingsboard.server.common.msg.queue.TopicPartitionInfo;
+import org.thingsboard.server.dao.notification.NotificationService;
+import org.thingsboard.server.gen.transport.TransportProtos;
+import org.thingsboard.server.queue.discovery.NotificationsTopicService;
+import org.thingsboard.server.queue.discovery.PartitionService;
+import org.thingsboard.server.queue.discovery.TbServiceInfoProvider;
+import org.thingsboard.server.queue.util.TbCoreComponent;
+import org.thingsboard.server.service.notification.NotificationProcessingService;
+import org.thingsboard.server.service.security.model.SecurityUser;
+import org.thingsboard.server.service.subscription.TbLocalSubscriptionService;
+import org.thingsboard.server.service.subscription.TbSubscriptionUtils;
+import org.thingsboard.server.service.telemetry.AbstractSubscriptionService;
+import org.thingsboard.server.service.ws.WebSocketSessionRef;
+import org.thingsboard.server.service.ws.notification.cmd.MarkNotificationAsReadCmd;
+import org.thingsboard.server.service.ws.notification.cmd.NotificationsSubCmd;
+import org.thingsboard.server.service.ws.notification.cmd.UnreadNotificationsUpdate;
+import org.thingsboard.server.service.ws.telemetry.WebSocketService;
+import org.thingsboard.server.service.ws.telemetry.cmd.v2.UnsubscribeCmd;
+
+import java.util.HashSet;
+import java.util.Set;
+import java.util.UUID;
+import java.util.stream.Collectors;
+
+@Service
+@TbCoreComponent
+@Slf4j
+public class DefaultNotificationsSubscriptionService extends AbstractSubscriptionService implements NotificationsSubscriptionService {
+
+    private final WebSocketService wsService;
+    private final TbLocalSubscriptionService localSubscriptionService;
+    private final NotificationService notificationService;
+    private final TbServiceInfoProvider serviceInfoProvider;
+    private final NotificationsTopicService notificationsTopicService;
+    private final NotificationProcessingService notificationProcessingService;
+
+    public DefaultNotificationsSubscriptionService(TbClusterService clusterService, PartitionService partitionService,
+                                                   @Lazy WebSocketService wsService, TbLocalSubscriptionService localSubscriptionService,
+                                                   NotificationService notificationService, TbServiceInfoProvider serviceInfoProvider,
+                                                   NotificationsTopicService notificationsTopicService,
+                                                   @Lazy NotificationProcessingService notificationProcessingService) {
+        super(clusterService, partitionService);
+        this.wsService = wsService;
+        this.localSubscriptionService = localSubscriptionService;
+        this.notificationService = notificationService;
+        this.serviceInfoProvider = serviceInfoProvider;
+        this.notificationsTopicService = notificationsTopicService;
+        this.notificationProcessingService = notificationProcessingService;
+    }
+
+    @Override
+    public void handleUnreadNotificationsSubCmd(WebSocketSessionRef sessionRef, NotificationsSubCmd cmd) {
+        SecurityUser user = sessionRef.getSecurityCtx();
+        NotificationsSubscription subscription = NotificationsSubscription.builder()
+                .serviceId(serviceInfoProvider.getServiceId())
+                .sessionId(sessionRef.getSessionId())
+                .subscriptionId(cmd.getCmdId())
+                .tenantId(user.getTenantId())
+                .entityId(user.getId())
+                .updateProcessor(this::handleSubscriptionUpdate)
+                .limit(cmd.getLimit())
+                .build();
+        localSubscriptionService.addSubscription(subscription);
+
+        fetchUnreadNotifications(subscription);
+        sendUpdate(sessionRef.getSessionId(), subscription.createFullUpdate());
+    }
+
+    @Override
+    public void handleMarkAsReadCmd(WebSocketSessionRef sessionRef, MarkNotificationAsReadCmd cmd) {
+        NotificationId notificationId = new NotificationId(cmd.getNotificationId());
+        notificationProcessingService.markNotificationAsRead(sessionRef.getSecurityCtx(), notificationId);
+    }
+
+    @Override
+    public void handleUnsubCmd(WebSocketSessionRef sessionRef, UnsubscribeCmd cmd) {
+        localSubscriptionService.cancelSubscription(sessionRef.getSessionId(), cmd.getCmdId());
+    }
+
+    private void fetchUnreadNotifications(NotificationsSubscription subscription) {
+        PageData<Notification> notifications = notificationService.findLatestUnreadNotificationsByUserId(subscription.getTenantId(),
+                (UserId) subscription.getEntityId(), subscription.getLimit());
+        subscription.getUnreadNotifications().clear();
+        subscription.getUnreadNotifications().putAll(notifications.getData().stream().collect(Collectors.toMap(IdBased::getUuidId, n -> n)));
+        subscription.getTotalUnreadCount().set((int) notifications.getTotalElements());
+    }
+
+    @Override
+    public void onNewNotification(TenantId tenantId, UserId recipientId, Notification notification) {
+        onNotificationUpdate(tenantId, recipientId, notification);
+    }
+
+    @Override
+    public void onNotificationUpdated(TenantId tenantId, UserId recipientId, Notification notification) {
+        onNotificationUpdate(tenantId, recipientId, notification);
+    }
+
+    private void onNotificationUpdate(TenantId tenantId, UserId recipientId, Notification notification) {
+        forwardToSubscriptionManagerServiceOrSendToCore(tenantId, recipientId, subscriptionManagerService -> {
+            subscriptionManagerService.onNotificationUpdate(tenantId, recipientId, notification, TbCallback.EMPTY);
+        }, () -> {
+            return TbSubscriptionUtils.notificationUpdateToProto(tenantId, recipientId, notification);
+        });
+    }
+
+    @Override
+    public void onNotificationRequestDeleted(TenantId tenantId, NotificationRequestId notificationRequestId) {
+        TransportProtos.ToCoreMsg notificationRequestDeletedProto = TbSubscriptionUtils.notificationRequestDeletedToProto(tenantId, notificationRequestId);
+        Set<String> coreServices = new HashSet<>(partitionService.getAllServiceIds(ServiceType.TB_CORE));
+        for (String serviceId : coreServices) {
+            TopicPartitionInfo tpi = notificationsTopicService.getNotificationsTopic(ServiceType.TB_CORE, serviceId);
+            clusterService.pushMsgToCore(tpi, UUID.randomUUID(), notificationRequestDeletedProto, null);
+        }
+    }
+
+
+    private void handleSubscriptionUpdate(NotificationsSubscription subscription, NotificationsSubscriptionUpdate subscriptionUpdate) {
+        if (subscriptionUpdate.getNotification() != null) {
+            Notification notification = subscriptionUpdate.getNotification();
+            if (notification.getStatus() == NotificationStatus.READ) {
+                fetchUnreadNotifications(subscription);
+                sendUpdate(subscription.getSessionId(), subscription.createFullUpdate());
+            } else {
+                Notification previous = subscription.getUnreadNotifications().put(notification.getUuidId(), notification);
+                if (previous == null) {
+                    subscription.getTotalUnreadCount().incrementAndGet();
+                    Set<UUID> beyondLimit = subscription.getUnreadNotifications().keySet().stream()
+                            .skip(subscription.getLimit())
+                            .collect(Collectors.toSet());
+                    beyondLimit.forEach(notificationId -> subscription.getUnreadNotifications().remove(notificationId));
+                }
+                sendUpdate(subscription.getSessionId(), subscription.createPartialUpdate(notification));
+            }
+        } else if (subscriptionUpdate.isNotificationRequestDeleted()) {
+            if (subscription.getUnreadNotifications().values().stream()
+                    .anyMatch(notification -> notification.getRequestId().equals(subscriptionUpdate.getNotificationRequestId()))) {
+                fetchUnreadNotifications(subscription);
+                sendUpdate(subscription.getSessionId(), subscription.createFullUpdate());
+            }
+        }
+    }
+
+    private void sendUpdate(String sessionId, UnreadNotificationsUpdate update) {
+        wsService.sendWsMsg(sessionId, update);;
+    }
+
+    @Override
+    protected String getExecutorPrefix() {
+        return "notification";
+    }
+
+}

application/src/main/java/org/thingsboard/server/service/ws/notification/sub/NotificationsSubscription.java

@@ -0,0 +1,64 @@
+/**
+ * Copyright © 2016-2022 The Thingsboard Authors
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.thingsboard.server.service.ws.notification.sub;
+
+import lombok.Builder;
+import lombok.Getter;
+import org.thingsboard.server.common.data.id.EntityId;
+import org.thingsboard.server.common.data.id.TenantId;
+import org.thingsboard.server.common.data.notification.Notification;
+import org.thingsboard.server.service.subscription.TbSubscription;
+import org.thingsboard.server.service.subscription.TbSubscriptionType;
+import org.thingsboard.server.service.ws.notification.cmd.UnreadNotificationsUpdate;
+
+import java.util.LinkedHashMap;
+import java.util.Map;
+import java.util.UUID;
+import java.util.concurrent.atomic.AtomicInteger;
+import java.util.function.BiConsumer;
+
+@Getter
+public class NotificationsSubscription extends TbSubscription<NotificationsSubscriptionUpdate> {
+
+    private final Map<UUID, Notification> unreadNotifications = new LinkedHashMap<>();
+    private final int limit;
+    private final AtomicInteger totalUnreadCount = new AtomicInteger();
+
+    @Builder
+    public NotificationsSubscription(String serviceId, String sessionId, int subscriptionId, TenantId tenantId, EntityId entityId,
+                                     BiConsumer<NotificationsSubscription, NotificationsSubscriptionUpdate> updateProcessor,
+                                     int limit) {
+        super(serviceId, sessionId, subscriptionId, tenantId, entityId, TbSubscriptionType.NOTIFICATIONS, updateProcessor);
+        this.limit = limit;
+    }
+
+    public UnreadNotificationsUpdate createFullUpdate() {
+        return UnreadNotificationsUpdate.builder()
+                .cmdId(getSubscriptionId())
+                .notifications(unreadNotifications.values())
+                .totalUnreadCount(totalUnreadCount.get())
+                .build();
+    }
+
+    public UnreadNotificationsUpdate createPartialUpdate(Notification notification) {
+        return UnreadNotificationsUpdate.builder()
+                .cmdId(getSubscriptionId())
+                .update(notification)
+                .totalUnreadCount(totalUnreadCount.get())
+                .build();
+    }
+
+}

application/src/main/java/org/thingsboard/server/service/ws/notification/sub/NotificationsSubscriptionService.java

@@ -0,0 +1,42 @@
+/**
+ * Copyright © 2016-2022 The Thingsboard Authors
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.thingsboard.server.service.ws.notification.sub;
+
+import org.thingsboard.server.common.data.id.NotificationRequestId;
+import org.thingsboard.server.common.data.id.TenantId;
+import org.thingsboard.server.common.data.id.UserId;
+import org.thingsboard.server.common.data.notification.Notification;
+import org.thingsboard.server.service.ws.WebSocketSessionRef;
+import org.thingsboard.server.service.ws.notification.cmd.MarkNotificationAsReadCmd;
+import org.thingsboard.server.service.ws.notification.cmd.NotificationsSubCmd;
+import org.thingsboard.server.service.ws.telemetry.cmd.v2.UnsubscribeCmd;
+
+public interface NotificationsSubscriptionService {
+
+    void handleUnreadNotificationsSubCmd(WebSocketSessionRef sessionRef, NotificationsSubCmd cmd);
+
+    void handleMarkAsReadCmd(WebSocketSessionRef sessionRef, MarkNotificationAsReadCmd cmd);
+
+    void handleUnsubCmd(WebSocketSessionRef sessionRef, UnsubscribeCmd cmd);
+
+
+    void onNewNotification(TenantId tenantId, UserId recipientId, Notification notification);
+
+    void onNotificationUpdated(TenantId tenantId, UserId recipientId, Notification notification);
+
+    void onNotificationRequestDeleted(TenantId tenantId, NotificationRequestId notificationRequestId);
+
+}

application/src/main/java/org/thingsboard/server/service/ws/notification/sub/NotificationsSubscriptionUpdate.java

@@ -0,0 +1,32 @@
+/**
+ * Copyright © 2016-2022 The Thingsboard Authors
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.thingsboard.server.service.ws.notification.sub;
+
+import lombok.Builder;
+import lombok.Data;
+import org.thingsboard.server.common.data.id.NotificationRequestId;
+import org.thingsboard.server.common.data.notification.Notification;
+
+@Data
+@Builder
+public class NotificationsSubscriptionUpdate {
+
+    private final Notification notification;
+
+    private final boolean notificationRequestDeleted;
+    private final NotificationRequestId notificationRequestId;
+
+}

application/src/main/java/org/thingsboard/server/service/telemetry/TelemetryFeature.java → application/src/main/java/org/thingsboard/server/service/ws/telemetry/TelemetryFeature.java

@@ -13,7 +13,7 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-package org.thingsboard.server.service.telemetry;
+package org.thingsboard.server.service.ws.telemetry;
 
 /**
  * Created by ashvayka on 08.05.17.

application/src/main/java/org/thingsboard/server/service/telemetry/TelemetryWebSocketTextMsg.java → application/src/main/java/org/thingsboard/server/service/ws/telemetry/TelemetryWebSocketTextMsg.java

@@ -13,9 +13,10 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-package org.thingsboard.server.service.telemetry;
+package org.thingsboard.server.service.ws.telemetry;
 
 import lombok.Data;
+import org.thingsboard.server.service.ws.WebSocketSessionRef;
 
 /**
  * Created by ashvayka on 27.03.18.
@@ -23,7 +24,7 @@ import lombok.Data;
 @Data
 public class TelemetryWebSocketTextMsg {
 
-    private final TelemetryWebSocketSessionRef sessionRef;
+    private final WebSocketSessionRef sessionRef;
     private final String payload;
 
 }

application/src/main/java/org/thingsboard/server/service/telemetry/TelemetryWebSocketService.java → application/src/main/java/org/thingsboard/server/service/ws/telemetry/WebSocketService.java

@@ -13,21 +13,22 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-package org.thingsboard.server.service.telemetry;
+package org.thingsboard.server.service.ws.telemetry;
 
 import org.springframework.web.socket.CloseStatus;
-import org.thingsboard.server.service.telemetry.cmd.v2.CmdUpdate;
-import org.thingsboard.server.service.telemetry.cmd.v2.DataUpdate;
-import org.thingsboard.server.service.telemetry.sub.TelemetrySubscriptionUpdate;
+import org.thingsboard.server.service.ws.telemetry.cmd.v2.CmdUpdate;
+import org.thingsboard.server.service.ws.telemetry.sub.TelemetrySubscriptionUpdate;
+import org.thingsboard.server.service.ws.SessionEvent;
+import org.thingsboard.server.service.ws.WebSocketSessionRef;
 
 /**
  * Created by ashvayka on 27.03.18.
  */
-public interface TelemetryWebSocketService {
+public interface WebSocketService {
 
-    void handleWebSocketSessionEvent(TelemetryWebSocketSessionRef sessionRef, SessionEvent sessionEvent);
+    void handleWebSocketSessionEvent(WebSocketSessionRef sessionRef, SessionEvent sessionEvent);
 
-    void handleWebSocketMsg(TelemetryWebSocketSessionRef sessionRef, String msg);
+    void handleWebSocketMsg(WebSocketSessionRef sessionRef, String msg);
 
     void sendWsMsg(String sessionId, TelemetrySubscriptionUpdate update);
 

application/src/main/java/org/thingsboard/server/service/telemetry/cmd/TelemetryPluginCmdsWrapper.java → application/src/main/java/org/thingsboard/server/service/ws/telemetry/cmd/TelemetryPluginCmdsWrapper.java

@@ -13,18 +13,18 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-package org.thingsboard.server.service.telemetry.cmd;
+package org.thingsboard.server.service.ws.telemetry.cmd;
 
 import lombok.Data;
-import org.thingsboard.server.service.telemetry.cmd.v1.AttributesSubscriptionCmd;
-import org.thingsboard.server.service.telemetry.cmd.v1.GetHistoryCmd;
-import org.thingsboard.server.service.telemetry.cmd.v1.TimeseriesSubscriptionCmd;
-import org.thingsboard.server.service.telemetry.cmd.v2.AlarmDataCmd;
-import org.thingsboard.server.service.telemetry.cmd.v2.AlarmDataUnsubscribeCmd;
-import org.thingsboard.server.service.telemetry.cmd.v2.EntityCountCmd;
-import org.thingsboard.server.service.telemetry.cmd.v2.EntityCountUnsubscribeCmd;
-import org.thingsboard.server.service.telemetry.cmd.v2.EntityDataCmd;
-import org.thingsboard.server.service.telemetry.cmd.v2.EntityDataUnsubscribeCmd;
+import org.thingsboard.server.service.ws.telemetry.cmd.v1.AttributesSubscriptionCmd;
+import org.thingsboard.server.service.ws.telemetry.cmd.v1.GetHistoryCmd;
+import org.thingsboard.server.service.ws.telemetry.cmd.v1.TimeseriesSubscriptionCmd;
+import org.thingsboard.server.service.ws.telemetry.cmd.v2.EntityCountUnsubscribeCmd;
+import org.thingsboard.server.service.ws.telemetry.cmd.v2.AlarmDataCmd;
+import org.thingsboard.server.service.ws.telemetry.cmd.v2.AlarmDataUnsubscribeCmd;
+import org.thingsboard.server.service.ws.telemetry.cmd.v2.EntityCountCmd;
+import org.thingsboard.server.service.ws.telemetry.cmd.v2.EntityDataCmd;
+import org.thingsboard.server.service.ws.telemetry.cmd.v2.EntityDataUnsubscribeCmd;
 
 import java.util.List;
 

application/src/main/java/org/thingsboard/server/service/telemetry/cmd/v1/AttributesSubscriptionCmd.java → application/src/main/java/org/thingsboard/server/service/ws/telemetry/cmd/v1/AttributesSubscriptionCmd.java

@@ -13,10 +13,10 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-package org.thingsboard.server.service.telemetry.cmd.v1;
+package org.thingsboard.server.service.ws.telemetry.cmd.v1;
 
 import lombok.NoArgsConstructor;
-import org.thingsboard.server.service.telemetry.TelemetryFeature;
+import org.thingsboard.server.service.ws.telemetry.TelemetryFeature;
 
 /**
  * @author Andrew Shvayka

application/src/main/java/org/thingsboard/server/service/telemetry/cmd/v1/GetHistoryCmd.java → application/src/main/java/org/thingsboard/server/service/ws/telemetry/cmd/v1/GetHistoryCmd.java

@@ -13,7 +13,7 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-package org.thingsboard.server.service.telemetry.cmd.v1;
+package org.thingsboard.server.service.ws.telemetry.cmd.v1;
 
 import lombok.AllArgsConstructor;
 import lombok.Data;

application/src/main/java/org/thingsboard/server/service/telemetry/cmd/v1/SubscriptionCmd.java → application/src/main/java/org/thingsboard/server/service/ws/telemetry/cmd/v1/SubscriptionCmd.java

@@ -13,12 +13,12 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-package org.thingsboard.server.service.telemetry.cmd.v1;
+package org.thingsboard.server.service.ws.telemetry.cmd.v1;
 
 import lombok.AllArgsConstructor;
 import lombok.Data;
 import lombok.NoArgsConstructor;
-import org.thingsboard.server.service.telemetry.TelemetryFeature;
+import org.thingsboard.server.service.ws.telemetry.TelemetryFeature;
 
 @NoArgsConstructor
 @AllArgsConstructor

application/src/main/java/org/thingsboard/server/service/telemetry/cmd/v1/TelemetryPluginCmd.java → application/src/main/java/org/thingsboard/server/service/ws/telemetry/cmd/v1/TelemetryPluginCmd.java

@@ -13,7 +13,7 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-package org.thingsboard.server.service.telemetry.cmd.v1;
+package org.thingsboard.server.service.ws.telemetry.cmd.v1;
 
 /**
  * @author Andrew Shvayka

application/src/main/java/org/thingsboard/server/service/telemetry/cmd/v1/TimeseriesSubscriptionCmd.java → application/src/main/java/org/thingsboard/server/service/ws/telemetry/cmd/v1/TimeseriesSubscriptionCmd.java

@@ -13,12 +13,12 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-package org.thingsboard.server.service.telemetry.cmd.v1;
+package org.thingsboard.server.service.ws.telemetry.cmd.v1;
 
 import lombok.AllArgsConstructor;
 import lombok.Data;
 import lombok.NoArgsConstructor;
-import org.thingsboard.server.service.telemetry.TelemetryFeature;
+import org.thingsboard.server.service.ws.telemetry.TelemetryFeature;
 
 /**
  * @author Andrew Shvayka

application/src/main/java/org/thingsboard/server/service/telemetry/cmd/v2/AggHistoryCmd.java → application/src/main/java/org/thingsboard/server/service/ws/telemetry/cmd/v2/AggHistoryCmd.java

@@ -13,7 +13,7 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-package org.thingsboard.server.service.telemetry.cmd.v2;
+package org.thingsboard.server.service.ws.telemetry.cmd.v2;
 
 import lombok.Data;
 

application/src/main/java/org/thingsboard/server/service/telemetry/cmd/v2/AggKey.java → application/src/main/java/org/thingsboard/server/service/ws/telemetry/cmd/v2/AggKey.java

@@ -13,7 +13,7 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-package org.thingsboard.server.service.telemetry.cmd.v2;
+package org.thingsboard.server.service.ws.telemetry.cmd.v2;
 
 import lombok.Data;
 import org.thingsboard.server.common.data.kv.Aggregation;

application/src/main/java/org/thingsboard/server/service/telemetry/cmd/v2/AggTimeSeriesCmd.java → application/src/main/java/org/thingsboard/server/service/ws/telemetry/cmd/v2/AggTimeSeriesCmd.java

@@ -13,7 +13,7 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-package org.thingsboard.server.service.telemetry.cmd.v2;
+package org.thingsboard.server.service.ws.telemetry.cmd.v2;
 
 import lombok.Data;
 

application/src/main/java/org/thingsboard/server/service/telemetry/cmd/v2/AlarmDataCmd.java → application/src/main/java/org/thingsboard/server/service/ws/telemetry/cmd/v2/AlarmDataCmd.java

@@ -13,7 +13,7 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-package org.thingsboard.server.service.telemetry.cmd.v2;
+package org.thingsboard.server.service.ws.telemetry.cmd.v2;
 
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonProperty;

application/src/main/java/org/thingsboard/server/service/telemetry/cmd/v2/AlarmDataUnsubscribeCmd.java → application/src/main/java/org/thingsboard/server/service/ws/telemetry/cmd/v2/AlarmDataUnsubscribeCmd.java

@@ -13,7 +13,7 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-package org.thingsboard.server.service.telemetry.cmd.v2;
+package org.thingsboard.server.service.ws.telemetry.cmd.v2;
 
 import lombok.Data;
 

application/src/main/java/org/thingsboard/server/service/telemetry/cmd/v2/AlarmDataUpdate.java → application/src/main/java/org/thingsboard/server/service/ws/telemetry/cmd/v2/AlarmDataUpdate.java

@@ -13,7 +13,7 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-package org.thingsboard.server.service.telemetry.cmd.v2;
+package org.thingsboard.server.service.ws.telemetry.cmd.v2;
 
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonProperty;
@@ -21,7 +21,7 @@ import lombok.Getter;
 import lombok.ToString;
 import org.thingsboard.server.common.data.page.PageData;
 import org.thingsboard.server.common.data.query.AlarmData;
-import org.thingsboard.server.service.telemetry.sub.SubscriptionErrorCode;
+import org.thingsboard.server.service.subscription.SubscriptionErrorCode;
 
 import java.util.List;
 

application/src/main/java/org/thingsboard/server/service/telemetry/cmd/v2/CmdUpdate.java → application/src/main/java/org/thingsboard/server/service/ws/telemetry/cmd/v2/CmdUpdate.java

@@ -13,7 +13,7 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-package org.thingsboard.server.service.telemetry.cmd.v2;
+package org.thingsboard.server.service.ws.telemetry.cmd.v2;
 
 import com.fasterxml.jackson.annotation.JsonIgnoreProperties;
 import lombok.AllArgsConstructor;

application/src/main/java/org/thingsboard/server/service/telemetry/cmd/v2/CmdUpdateType.java → application/src/main/java/org/thingsboard/server/service/ws/telemetry/cmd/v2/CmdUpdateType.java

@@ -13,10 +13,11 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-package org.thingsboard.server.service.telemetry.cmd.v2;
+package org.thingsboard.server.service.ws.telemetry.cmd.v2;
 
 public enum CmdUpdateType {
     ENTITY_DATA,
     ALARM_DATA,
-    COUNT_DATA
+    COUNT_DATA,
+    NOTIFICATIONS
 }

application/src/main/java/org/thingsboard/server/service/telemetry/cmd/v2/DataCmd.java → application/src/main/java/org/thingsboard/server/service/ws/telemetry/cmd/v2/DataCmd.java

@@ -13,11 +13,10 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-package org.thingsboard.server.service.telemetry.cmd.v2;
+package org.thingsboard.server.service.ws.telemetry.cmd.v2;
 
 import lombok.Data;
 import lombok.Getter;
-import lombok.NoArgsConstructor;
 
 @Data
 public class DataCmd {

application/src/main/java/org/thingsboard/server/service/telemetry/cmd/v2/DataUpdate.java → application/src/main/java/org/thingsboard/server/service/ws/telemetry/cmd/v2/DataUpdate.java

@@ -13,11 +13,11 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-package org.thingsboard.server.service.telemetry.cmd.v2;
+package org.thingsboard.server.service.ws.telemetry.cmd.v2;
 
 import lombok.Getter;
 import org.thingsboard.server.common.data.page.PageData;
-import org.thingsboard.server.service.telemetry.sub.SubscriptionErrorCode;
+import org.thingsboard.server.service.subscription.SubscriptionErrorCode;
 
 import java.util.List;
 

application/src/main/java/org/thingsboard/server/service/telemetry/cmd/v2/EntityCountCmd.java → application/src/main/java/org/thingsboard/server/service/ws/telemetry/cmd/v2/EntityCountCmd.java

@@ -13,13 +13,12 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-package org.thingsboard.server.service.telemetry.cmd.v2;
+package org.thingsboard.server.service.ws.telemetry.cmd.v2;
 
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonProperty;
 import lombok.Getter;
 import org.thingsboard.server.common.data.query.EntityCountQuery;
-import org.thingsboard.server.common.data.query.EntityDataQuery;
 
 public class EntityCountCmd extends DataCmd {
 

application/src/main/java/org/thingsboard/server/service/telemetry/cmd/v2/EntityCountUnsubscribeCmd.java → application/src/main/java/org/thingsboard/server/service/ws/telemetry/cmd/v2/EntityCountUnsubscribeCmd.java

@@ -13,7 +13,7 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-package org.thingsboard.server.service.telemetry.cmd.v2;
+package org.thingsboard.server.service.ws.telemetry.cmd.v2;
 
 import lombok.Data;
 

application/src/main/java/org/thingsboard/server/service/telemetry/cmd/v2/EntityCountUpdate.java → application/src/main/java/org/thingsboard/server/service/ws/telemetry/cmd/v2/EntityCountUpdate.java

@@ -13,17 +13,13 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-package org.thingsboard.server.service.telemetry.cmd.v2;
+package org.thingsboard.server.service.ws.telemetry.cmd.v2;
 
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonProperty;
 import lombok.Getter;
 import lombok.ToString;
-import org.thingsboard.server.common.data.page.PageData;
-import org.thingsboard.server.common.data.query.EntityData;
-import org.thingsboard.server.service.telemetry.sub.SubscriptionErrorCode;
-
-import java.util.List;
+import org.thingsboard.server.service.subscription.SubscriptionErrorCode;
 
 @ToString
 public class EntityCountUpdate extends CmdUpdate {

application/src/main/java/org/thingsboard/server/service/telemetry/cmd/v2/EntityDataCmd.java → application/src/main/java/org/thingsboard/server/service/ws/telemetry/cmd/v2/EntityDataCmd.java

@@ -13,7 +13,7 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-package org.thingsboard.server.service.telemetry.cmd.v2;
+package org.thingsboard.server.service.ws.telemetry.cmd.v2;
 
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonIgnore;

application/src/main/java/org/thingsboard/server/service/telemetry/cmd/v2/EntityDataUnsubscribeCmd.java → application/src/main/java/org/thingsboard/server/service/ws/telemetry/cmd/v2/EntityDataUnsubscribeCmd.java

@@ -13,7 +13,7 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-package org.thingsboard.server.service.telemetry.cmd.v2;
+package org.thingsboard.server.service.ws.telemetry.cmd.v2;
 
 import lombok.Data;
 

application/src/main/java/org/thingsboard/server/service/telemetry/cmd/v2/EntityDataUpdate.java → application/src/main/java/org/thingsboard/server/service/ws/telemetry/cmd/v2/EntityDataUpdate.java

@@ -13,7 +13,7 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-package org.thingsboard.server.service.telemetry.cmd.v2;
+package org.thingsboard.server.service.ws.telemetry.cmd.v2;
 
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonProperty;
@@ -21,7 +21,7 @@ import lombok.Getter;
 import lombok.ToString;
 import org.thingsboard.server.common.data.page.PageData;
 import org.thingsboard.server.common.data.query.EntityData;
-import org.thingsboard.server.service.telemetry.sub.SubscriptionErrorCode;
+import org.thingsboard.server.service.subscription.SubscriptionErrorCode;
 
 import java.util.List;
 

application/src/main/java/org/thingsboard/server/service/telemetry/cmd/v2/EntityHistoryCmd.java → application/src/main/java/org/thingsboard/server/service/ws/telemetry/cmd/v2/EntityHistoryCmd.java

@@ -13,7 +13,7 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-package org.thingsboard.server.service.telemetry.cmd.v2;
+package org.thingsboard.server.service.ws.telemetry.cmd.v2;
 
 import lombok.Data;
 import org.thingsboard.server.common.data.kv.Aggregation;

application/src/main/java/org/thingsboard/server/service/telemetry/cmd/v2/GetTsCmd.java → application/src/main/java/org/thingsboard/server/service/ws/telemetry/cmd/v2/GetTsCmd.java

@@ -13,7 +13,7 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-package org.thingsboard.server.service.telemetry.cmd.v2;
+package org.thingsboard.server.service.ws.telemetry.cmd.v2;
 
 import org.thingsboard.server.common.data.kv.Aggregation;
 

application/src/main/java/org/thingsboard/server/service/telemetry/cmd/v2/LatestValueCmd.java → application/src/main/java/org/thingsboard/server/service/ws/telemetry/cmd/v2/LatestValueCmd.java

@@ -13,7 +13,7 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-package org.thingsboard.server.service.telemetry.cmd.v2;
+package org.thingsboard.server.service.ws.telemetry.cmd.v2;
 
 import lombok.Data;
 import org.thingsboard.server.common.data.query.EntityKey;

application/src/main/java/org/thingsboard/server/service/telemetry/cmd/v2/TimeSeriesCmd.java → application/src/main/java/org/thingsboard/server/service/ws/telemetry/cmd/v2/TimeSeriesCmd.java

@@ -13,7 +13,7 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-package org.thingsboard.server.service.telemetry.cmd.v2;
+package org.thingsboard.server.service.ws.telemetry.cmd.v2;
 
 import com.fasterxml.jackson.annotation.JsonIgnore;
 import lombok.Data;

application/src/main/java/org/thingsboard/server/service/telemetry/cmd/v2/UnsubscribeCmd.java → application/src/main/java/org/thingsboard/server/service/ws/telemetry/cmd/v2/UnsubscribeCmd.java

@@ -13,7 +13,7 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-package org.thingsboard.server.service.telemetry.cmd.v2;
+package org.thingsboard.server.service.ws.telemetry.cmd.v2;
 
 public interface UnsubscribeCmd {
 

application/src/main/java/org/thingsboard/server/service/telemetry/sub/AlarmSubscriptionUpdate.java → application/src/main/java/org/thingsboard/server/service/ws/telemetry/sub/AlarmSubscriptionUpdate.java

@@ -13,19 +13,11 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-package org.thingsboard.server.service.telemetry.sub;
+package org.thingsboard.server.service.ws.telemetry.sub;
 
 import lombok.Getter;
 import org.thingsboard.server.common.data.alarm.Alarm;
-import org.thingsboard.server.common.data.kv.TsKvEntry;
-import org.thingsboard.server.common.data.query.AlarmData;
-
-import java.util.ArrayList;
-import java.util.Collections;
-import java.util.List;
-import java.util.Map;
-import java.util.TreeMap;
-import java.util.stream.Collectors;
+import org.thingsboard.server.service.subscription.SubscriptionErrorCode;
 
 public class AlarmSubscriptionUpdate {
 

application/src/main/java/org/thingsboard/server/service/telemetry/sub/SubscriptionState.java → application/src/main/java/org/thingsboard/server/service/ws/telemetry/sub/SubscriptionState.java

@@ -13,13 +13,13 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-package org.thingsboard.server.service.telemetry.sub;
+package org.thingsboard.server.service.ws.telemetry.sub;
 
 import lombok.AllArgsConstructor;
 import lombok.Getter;
 import org.thingsboard.server.common.data.id.EntityId;
 import org.thingsboard.server.common.data.id.TenantId;
-import org.thingsboard.server.service.telemetry.TelemetryFeature;
+import org.thingsboard.server.service.ws.telemetry.TelemetryFeature;
 
 import java.util.Map;
 

application/src/main/java/org/thingsboard/server/service/telemetry/sub/TelemetrySubscriptionUpdate.java → application/src/main/java/org/thingsboard/server/service/ws/telemetry/sub/TelemetrySubscriptionUpdate.java

@@ -13,9 +13,10 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-package org.thingsboard.server.service.telemetry.sub;
+package org.thingsboard.server.service.ws.telemetry.sub;
 
 import org.thingsboard.server.common.data.kv.TsKvEntry;
+import org.thingsboard.server.service.subscription.SubscriptionErrorCode;
 
 import java.util.ArrayList;
 import java.util.Collections;

application/src/test/java/org/thingsboard/server/controller/AbstractControllerTest.java

@@ -53,6 +53,7 @@ public abstract class AbstractControllerTest extends AbstractNotifyEntityTest {
     protected int wsPort;
 
     private TbTestWebSocketClient wsClient; // lazy
+    private TbTestWebSocketClient anotherWsClient; // lazy
 
     public TbTestWebSocketClient getWsClient() {
         if (wsClient == null) {
@@ -69,6 +70,21 @@ public abstract class AbstractControllerTest extends AbstractNotifyEntityTest {
         return wsClient;
     }
 
+    public TbTestWebSocketClient getAnotherWsClient() {
+        if (anotherWsClient == null) {
+            synchronized (this) {
+                try {
+                    if (anotherWsClient == null) {
+                        anotherWsClient = buildAndConnectWebSocketClient();
+                    }
+                } catch (Exception e) {
+                    throw new RuntimeException(e);
+                }
+            }
+        }
+        return anotherWsClient;
+    }
+
     @Before
     public void beforeWsTest() throws Exception {
         // placeholder
@@ -79,9 +95,12 @@ public abstract class AbstractControllerTest extends AbstractNotifyEntityTest {
         if (wsClient != null) {
             wsClient.close();
         }
+        if (anotherWsClient != null) {
+            anotherWsClient.close();
+        }
     }
 
-    private TbTestWebSocketClient buildAndConnectWebSocketClient() throws URISyntaxException, InterruptedException {
+    protected TbTestWebSocketClient buildAndConnectWebSocketClient() throws URISyntaxException, InterruptedException {
         TbTestWebSocketClient wsClient = new TbTestWebSocketClient(new URI(WS_URL + wsPort + "/api/ws/plugins/telemetry?token=" + token));
         assertThat(wsClient.connectBlocking(TIMEOUT, TimeUnit.SECONDS)).isTrue();
         return wsClient;

application/src/test/java/org/thingsboard/server/controller/BaseWebsocketApiTest.java

@@ -44,9 +44,9 @@ import org.thingsboard.server.common.data.query.NumericFilterPredicate;
 import org.thingsboard.server.common.data.query.TsValue;
 import org.thingsboard.server.service.subscription.TbAttributeSubscriptionScope;
 import org.thingsboard.server.service.telemetry.TelemetrySubscriptionService;
-import org.thingsboard.server.service.telemetry.cmd.v2.EntityCountCmd;
-import org.thingsboard.server.service.telemetry.cmd.v2.EntityCountUpdate;
-import org.thingsboard.server.service.telemetry.cmd.v2.EntityDataUpdate;
+import org.thingsboard.server.service.ws.telemetry.cmd.v2.EntityCountCmd;
+import org.thingsboard.server.service.ws.telemetry.cmd.v2.EntityCountUpdate;
+import org.thingsboard.server.service.ws.telemetry.cmd.v2.EntityDataUpdate;
 
 import java.util.Arrays;
 import java.util.Collections;

application/src/test/java/org/thingsboard/server/controller/TbTestWebSocketClient.java

@@ -24,14 +24,14 @@ import org.thingsboard.server.common.data.query.EntityDataPageLink;
 import org.thingsboard.server.common.data.query.EntityDataQuery;
 import org.thingsboard.server.common.data.query.EntityFilter;
 import org.thingsboard.server.common.data.query.EntityKey;
-import org.thingsboard.server.service.telemetry.cmd.TelemetryPluginCmdsWrapper;
-import org.thingsboard.server.service.telemetry.cmd.v2.EntityCountCmd;
-import org.thingsboard.server.service.telemetry.cmd.v2.EntityCountUpdate;
-import org.thingsboard.server.service.telemetry.cmd.v2.EntityDataCmd;
-import org.thingsboard.server.service.telemetry.cmd.v2.EntityDataUpdate;
-import org.thingsboard.server.service.telemetry.cmd.v2.EntityHistoryCmd;
-import org.thingsboard.server.service.telemetry.cmd.v2.LatestValueCmd;
-import org.thingsboard.server.service.telemetry.cmd.v2.TimeSeriesCmd;
+import org.thingsboard.server.service.ws.telemetry.cmd.TelemetryPluginCmdsWrapper;
+import org.thingsboard.server.service.ws.telemetry.cmd.v2.EntityCountCmd;
+import org.thingsboard.server.service.ws.telemetry.cmd.v2.EntityCountUpdate;
+import org.thingsboard.server.service.ws.telemetry.cmd.v2.EntityDataCmd;
+import org.thingsboard.server.service.ws.telemetry.cmd.v2.EntityDataUpdate;
+import org.thingsboard.server.service.ws.telemetry.cmd.v2.EntityHistoryCmd;
+import org.thingsboard.server.service.ws.telemetry.cmd.v2.LatestValueCmd;
+import org.thingsboard.server.service.ws.telemetry.cmd.v2.TimeSeriesCmd;
 
 import java.net.URI;
 import java.nio.channels.NotYetConnectedException;

application/src/test/java/org/thingsboard/server/service/notification/NotificationsWebSocketClient.java

@@ -0,0 +1,75 @@
+package org.thingsboard.server.service.notification;
+
+import lombok.Getter;
+import org.apache.commons.lang3.RandomUtils;
+import org.thingsboard.common.util.JacksonUtil;
+import org.thingsboard.server.common.data.id.IdBased;
+import org.thingsboard.server.common.data.notification.Notification;
+import org.thingsboard.server.controller.TbTestWebSocketClient;
+import org.thingsboard.server.service.ws.notification.cmd.MarkNotificationAsReadCmd;
+import org.thingsboard.server.service.ws.notification.cmd.NotificationCmdsWrapper;
+import org.thingsboard.server.service.ws.notification.cmd.NotificationsSubCmd;
+import org.thingsboard.server.service.ws.notification.cmd.UnreadNotificationsUpdate;
+import org.thingsboard.server.service.ws.notification.sub.NotificationsSubscriptionUpdate;
+
+import java.net.URI;
+import java.net.URISyntaxException;
+import java.util.LinkedHashMap;
+import java.util.Map;
+import java.util.UUID;
+import java.util.stream.Collectors;
+
+public class NotificationsWebSocketClient extends TbTestWebSocketClient {
+
+    private final Map<UUID, Notification> currentNotifications = new LinkedHashMap<>();
+    @Getter
+    private int totalUnreadCount;
+    @Getter
+    private UnreadNotificationsUpdate lastUpdate;
+
+    public NotificationsWebSocketClient(String wsUrl, String token) throws URISyntaxException {
+        super(new URI(wsUrl + "/api/ws/plugins/notifications?token=" + token));
+    }
+
+    public void subscribeForUnreadNotifications(int limit) {
+        NotificationCmdsWrapper cmdsWrapper = new NotificationCmdsWrapper();
+        cmdsWrapper.setUnreadSubCmd(new NotificationsSubCmd(newCmdId(), limit));
+        sendCmd(cmdsWrapper);
+    }
+
+    public void markNotificationAsRead(UUID notificationId) {
+        NotificationCmdsWrapper cmdsWrapper = new NotificationCmdsWrapper();
+        cmdsWrapper.setMarkAsReadCmd(new MarkNotificationAsReadCmd(newCmdId(), notificationId));
+        sendCmd(cmdsWrapper);
+    }
+
+
+    private void handleUpdate(UnreadNotificationsUpdate update) {
+        totalUnreadCount = update.getTotalUnreadCount();
+        if (update.getNotifications() != null) {
+            currentNotifications.clear();
+            currentNotifications.putAll(update.getNotifications().stream().collect(Collectors.toMap(IdBased::getUuidId, n -> n)));
+        } else if (update.getUpdate() != null) {
+            Notification notification = update.getUpdate();
+            currentNotifications.put(notification.getUuidId(), notification);
+        }
+    }
+
+
+    public void sendCmd(NotificationCmdsWrapper cmdsWrapper) {
+        send(JacksonUtil.toString(cmdsWrapper));
+    }
+
+    @Override
+    public void onMessage(String s) {
+        UnreadNotificationsUpdate update = JacksonUtil.fromString(s, UnreadNotificationsUpdate.class);
+        lastUpdate = update;
+        handleUpdate(update);
+        super.onMessage(s);
+    }
+
+    private static int newCmdId() {
+        return RandomUtils.nextInt(1, 1000);
+    }
+
+}

application/src/test/java/org/thingsboard/server/service/notification/NotificationsWsApiTest.java

@@ -0,0 +1,147 @@
+package org.thingsboard.server.service.notification;
+
+import org.junit.Before;
+import org.junit.Test;
+import org.thingsboard.server.common.data.id.NotificationTargetId;
+import org.thingsboard.server.common.data.id.UserId;
+import org.thingsboard.server.common.data.notification.Notification;
+import org.thingsboard.server.common.data.notification.NotificationRequest;
+import org.thingsboard.server.common.data.notification.targets.NotificationTarget;
+import org.thingsboard.server.common.data.notification.targets.SingleUserNotificationTargetConfig;
+import org.thingsboard.server.controller.AbstractControllerTest;
+import org.thingsboard.server.controller.TbTestWebSocketClient;
+import org.thingsboard.server.dao.service.DaoSqlTest;
+import org.thingsboard.server.service.ws.notification.cmd.UnreadNotificationsUpdate;
+
+import java.net.URISyntaxException;
+import java.util.concurrent.TimeUnit;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+@DaoSqlTest
+public class NotificationsWsApiTest extends AbstractControllerTest {
+
+    @Before
+    public void beforeEach() throws Exception {
+        loginTenantAdmin();
+    }
+
+    @Test
+    public void testSubscribingToUnreadNotifications_multipleSessions() throws Exception {
+        NotificationTarget notificationTarget = createNotificationTarget(tenantAdminUserId);
+        String notificationText1 = "Notification 1";
+        submitNotificationRequest(notificationTarget.getId(), "Just a test", notificationText1);
+        String notificationText2 = "Notification 2";
+        submitNotificationRequest(notificationTarget.getId(), "Just a test", notificationText2);
+
+        getWsClient().subscribeForUnreadNotifications(10);
+        getAnotherWsClient().subscribeForUnreadNotifications(10);
+        getWsClient().waitForReply();
+        getAnotherWsClient().waitForReply();
+
+        checkFullNotificationsUpdate(getWsClient().getLastUpdate(), notificationText1, notificationText2);
+        checkFullNotificationsUpdate(getAnotherWsClient().getLastUpdate(), notificationText1, notificationText2);
+    }
+
+    @Test
+    public void testReceivingNotificationUpdates_multipleSessions() {
+        getWsClient().subscribeForUnreadNotifications(10);
+        getAnotherWsClient().subscribeForUnreadNotifications(10);
+        getWsClient().waitForReply();
+        getAnotherWsClient().waitForReply();
+        UnreadNotificationsUpdate notificationsUpdate = getWsClient().getLastUpdate();
+        assertThat(notificationsUpdate.getTotalUnreadCount()).isZero();
+
+        getWsClient().registerWaitForUpdate();
+        getAnotherWsClient().registerWaitForUpdate();
+        NotificationTarget notificationTarget = createNotificationTarget(tenantAdminUserId);
+        String notificationText = "Notification 1";
+        submitNotificationRequest(notificationTarget.getId(), "Just a test", notificationText);
+        getWsClient().waitForUpdate();
+        getAnotherWsClient().waitForUpdate();
+
+        checkPartialNotificationsUpdate(getWsClient().getLastUpdate(), notificationText, 1);
+        checkPartialNotificationsUpdate(getAnotherWsClient().getLastUpdate(), notificationText, 1);
+    }
+
+    @Test
+    public void testMarkingAsRead_multipleSessions() {
+        getWsClient().subscribeForUnreadNotifications(10);
+        getAnotherWsClient().subscribeForUnreadNotifications(10);
+        getWsClient().waitForReply();
+        getAnotherWsClient().waitForReply();
+
+        NotificationTarget notificationTarget = createNotificationTarget(tenantAdminUserId);
+        getWsClient().registerWaitForUpdate();
+        String notificationText1 = "Notification 1";
+        submitNotificationRequest(notificationTarget.getId(), "Just a test", notificationText1);
+        getWsClient().waitForUpdate();
+        Notification notification1 = getWsClient().getLastUpdate().getUpdate();
+
+        getWsClient().registerWaitForUpdate();
+        String notificationText2 = "Notification 2";
+        submitNotificationRequest(notificationTarget.getId(), "Just a test", notificationText2);
+        getWsClient().waitForUpdate();
+        assertThat(getWsClient().getLastUpdate().getTotalUnreadCount()).isEqualTo(2);
+
+        getWsClient().registerWaitForUpdate();
+        getAnotherWsClient().registerWaitForUpdate();
+        getWsClient().markNotificationAsRead(notification1.getUuidId());
+        getWsClient().waitForUpdate();
+        getAnotherWsClient().waitForUpdate();
+
+        checkFullNotificationsUpdate(getWsClient().getLastUpdate(), notificationText2);
+        checkFullNotificationsUpdate(getAnotherWsClient().getLastUpdate(), notificationText2);
+    }
+
+    public void testReceivingUpdatesWhenSubscriptionAtAnotherInstance() {}
+
+
+    private void checkFullNotificationsUpdate(UnreadNotificationsUpdate notificationsUpdate, String... expectedNotifications) {
+        assertThat(notificationsUpdate.getNotifications()).extracting(Notification::getText).containsOnly(expectedNotifications);
+        assertThat(notificationsUpdate.getTotalUnreadCount()).isEqualTo(expectedNotifications.length);
+    }
+
+    private void checkPartialNotificationsUpdate(UnreadNotificationsUpdate notificationsUpdate, String expectedNotification, int expectedUnreadCount) {
+        assertThat(notificationsUpdate.getUpdate()).extracting(Notification::getText).isEqualTo(expectedNotification);
+        assertThat(notificationsUpdate.getTotalUnreadCount()).isEqualTo(expectedUnreadCount);
+    }
+
+    private NotificationTarget createNotificationTarget(UserId userId) {
+        NotificationTarget notificationTarget = new NotificationTarget();
+        notificationTarget.setTenantId(tenantId);
+        notificationTarget.setName("User " + userId);
+        SingleUserNotificationTargetConfig config = new SingleUserNotificationTargetConfig();
+        config.setUserId(userId);
+        notificationTarget.setConfiguration(config);
+        return doPost("/api/notification/target", notificationTarget, NotificationTarget.class);
+    }
+
+    private NotificationRequest submitNotificationRequest(NotificationTargetId targetId, String notificationReason, String text) {
+        NotificationRequest notificationRequest = NotificationRequest.builder()
+                .tenantId(tenantId)
+                .targetId(targetId)
+                .notificationReason(notificationReason)
+                .textTemplate(text)
+                .build();
+        return doPost("/api/notification/request", notificationRequest, NotificationRequest.class);
+    }
+
+    @Override
+    protected TbTestWebSocketClient buildAndConnectWebSocketClient() throws URISyntaxException, InterruptedException {
+        NotificationsWebSocketClient wsClient = new NotificationsWebSocketClient(WS_URL + wsPort, token);
+        assertThat(wsClient.connectBlocking(TIMEOUT, TimeUnit.SECONDS)).isTrue();
+        return wsClient;
+    }
+
+    @Override
+    public NotificationsWebSocketClient getWsClient() {
+        return (NotificationsWebSocketClient) super.getWsClient();
+    }
+
+    @Override
+    public NotificationsWebSocketClient getAnotherWsClient() {
+        return (NotificationsWebSocketClient) super.getAnotherWsClient();
+    }
+
+}

application/src/test/java/org/thingsboard/server/transport/lwm2m/AbstractLwM2MIntegrationTest.java

@@ -64,10 +64,10 @@ import org.thingsboard.server.common.data.security.DeviceCredentials;
 import org.thingsboard.server.common.data.security.DeviceCredentialsType;
 import org.thingsboard.server.controller.AbstractControllerTest;
 import org.thingsboard.server.dao.service.DaoSqlTest;
-import org.thingsboard.server.service.telemetry.cmd.TelemetryPluginCmdsWrapper;
-import org.thingsboard.server.service.telemetry.cmd.v2.EntityDataCmd;
-import org.thingsboard.server.service.telemetry.cmd.v2.EntityDataUpdate;
-import org.thingsboard.server.service.telemetry.cmd.v2.LatestValueCmd;
+import org.thingsboard.server.service.ws.telemetry.cmd.TelemetryPluginCmdsWrapper;
+import org.thingsboard.server.service.ws.telemetry.cmd.v2.EntityDataCmd;
+import org.thingsboard.server.service.ws.telemetry.cmd.v2.EntityDataUpdate;
+import org.thingsboard.server.service.ws.telemetry.cmd.v2.LatestValueCmd;
 import org.thingsboard.server.transport.lwm2m.client.LwM2MTestClient;
 import org.thingsboard.server.transport.lwm2m.server.client.LwM2mClientContext;
 import org.thingsboard.server.transport.lwm2m.server.uplink.DefaultLwM2mUplinkMsgHandler;

application/src/test/java/org/thingsboard/server/transport/mqtt/attributes/AbstractMqttAttributesIntegrationTest.java

@@ -22,7 +22,6 @@ import com.google.protobuf.InvalidProtocolBufferException;
 import com.squareup.wire.schema.internal.parser.ProtoFileElement;
 import io.netty.handler.codec.mqtt.MqttQoS;
 import lombok.extern.slf4j.Slf4j;
-import org.springframework.test.context.TestPropertySource;
 import org.thingsboard.common.util.JacksonUtil;
 import org.thingsboard.server.common.data.Device;
 import org.thingsboard.server.common.data.TransportPayloadType;
@@ -38,7 +37,7 @@ import org.thingsboard.server.common.data.query.EntityKeyType;
 import org.thingsboard.server.common.data.query.SingleEntityFilter;
 import org.thingsboard.server.gen.transport.TransportApiProtos;
 import org.thingsboard.server.gen.transport.TransportProtos;
-import org.thingsboard.server.service.telemetry.cmd.v2.EntityDataUpdate;
+import org.thingsboard.server.service.ws.telemetry.cmd.v2.EntityDataUpdate;
 import org.thingsboard.server.transport.mqtt.AbstractMqttIntegrationTest;
 import org.thingsboard.server.transport.mqtt.MqttTestCallback;
 import org.thingsboard.server.transport.mqtt.MqttTestClient;

common/cluster-api/src/main/proto/queue.proto

@@ -547,6 +547,11 @@ message TbAlarmSubscriptionProto {
   int64 ts = 2;
 }
 
+message NotificationsSubscriptionProto {
+  TbSubscriptionProto sub = 1;
+  int32 limit = 2;
+}
+
 message TbSubscriptionUpdateProto {
   string sessionId = 1;
   int32 subscriptionId = 2;
@@ -564,6 +569,27 @@ message TbAlarmSubscriptionUpdateProto {
   bool deleted = 6;
 }
 
+message NotificationsSubscriptionUpdateProto {
+  string sessionId = 1;
+  int32 subscriptionId = 2;
+  string notification = 3;
+}
+
+message NotificationUpdateProto {
+  int64 tenantIdMSB = 1;
+  int64 tenantIdLSB = 2;
+  int64 recipientIdMSB = 3;
+  int64 recipientIdLSB = 4;
+  string notification = 5;
+}
+
+message NotificationRequestDeleteProto {
+  int64 tenantIdMSB = 1;
+  int64 tenantIdLSB = 2;
+  int64 notificationRequestIdMSB = 3;
+  int64 notificationRequestIdLSB = 4;
+}
+
 message TbAttributeUpdateProto {
   string entityType = 1;
   int64 entityIdMSB = 2;
@@ -665,11 +691,15 @@ message SubscriptionMgrMsgProto {
   TbAlarmUpdateProto alarmUpdate = 8;
   TbAlarmDeleteProto alarmDelete = 9;
   TbTimeSeriesDeleteProto tsDelete = 10;
+  NotificationsSubscriptionProto notificationsSub = 11;
+  NotificationUpdateProto notificationUpdate = 12;
+  NotificationRequestDeleteProto notificationRequestDelete = 13;
 }
 
 message LocalSubscriptionServiceMsgProto {
   TbSubscriptionUpdateProto subUpdate = 1;
   TbAlarmSubscriptionUpdateProto alarmSubUpdate = 2;
+  NotificationsSubscriptionUpdateProto notificationsSubUpdate = 3;
 }
 
 message FromDeviceRPCResponseProto {

common/data/src/main/java/org/thingsboard/server/common/data/StringUtils.java

@@ -142,6 +142,15 @@ public class StringUtils {
         return org.apache.commons.lang3.StringUtils.equals(str1, str2);
     }
 
+    public static boolean equalsAny(String string, String... otherStrings) {
+        for (String otherString : otherStrings) {
+            if (equals(string, otherString)) {
+                return true;
+            }
+        }
+        return false;
+    }
+
     public static String substringAfterLast(String str, String sep) {
         return org.apache.commons.lang3.StringUtils.substringAfterLast(str, sep);
     }

dao/src/main/java/org/thingsboard/server/dao/notification/DefaultNotificationService.java

@@ -19,7 +19,9 @@ import lombok.RequiredArgsConstructor;
 import lombok.extern.slf4j.Slf4j;
 import org.apache.commons.lang3.StringUtils;
 import org.springframework.stereotype.Service;
+import org.springframework.transaction.annotation.Transactional;
 import org.thingsboard.server.common.data.id.NotificationId;
+import org.thingsboard.server.common.data.id.NotificationRequestId;
 import org.thingsboard.server.common.data.id.TenantId;
 import org.thingsboard.server.common.data.id.UserId;
 import org.thingsboard.server.common.data.notification.Notification;
@@ -55,11 +57,22 @@ public class DefaultNotificationService implements NotificationService {
         return notificationRequestDao.save(tenantId, notificationRequest);
     }
 
+    @Override
+    public NotificationRequest findNotificationRequestById(TenantId tenantId, NotificationRequestId id) {
+        return notificationRequestDao.findById(tenantId, id.getId());
+    }
+
     @Override
     public PageData<NotificationRequest> findNotificationRequestsByTenantIdAndPageLink(TenantId tenantId, PageLink pageLink) {
         return notificationRequestDao.findByTenantIdAndPageLink(tenantId, pageLink);
     }
 
+    // ON DELETE CASCADE is used: notifications for request are deleted as well
+    @Override
+    public void deleteNotificationRequest(TenantId tenantId, NotificationRequestId id) {
+        notificationRequestDao.removeById(tenantId, id.getId());
+    }
+
     @Override
     public Notification createNotification(TenantId tenantId, Notification notification) {
         if (notification.getId() != null) {
@@ -68,9 +81,11 @@ public class DefaultNotificationService implements NotificationService {
         return notificationDao.save(tenantId, notification);
     }
 
+    @Transactional
     @Override
-    public void updateNotificationStatus(TenantId tenantId, NotificationId notificationId, NotificationStatus status) {
+    public Notification updateNotificationStatus(TenantId tenantId, NotificationId notificationId, NotificationStatus status) {
         notificationDao.updateStatus(tenantId, notificationId, status);
+        return notificationDao.findById(tenantId, notificationId.getId());
     }
 
     @Override

dao/src/main/java/org/thingsboard/server/dao/notification/DefaultNotificationTargetService.java

@@ -42,6 +42,7 @@ public class DefaultNotificationTargetService implements NotificationTargetServi
 
     @Override
     public NotificationTarget saveNotificationTarget(TenantId tenantId, NotificationTarget notificationTarget) {
+        notificationTarget.setTenantId(tenantId);
         validator.validate(notificationTarget, NotificationTarget::getTenantId);
         return notificationTargetDao.save(tenantId, notificationTarget);
     }
@@ -81,6 +82,11 @@ public class DefaultNotificationTargetService implements NotificationTargetServi
     }
 
     private static class NotificationTargetValidator extends DataValidator<NotificationTarget> {
+
+        @Override
+        protected void validateDataImpl(TenantId tenantId, NotificationTarget notificationTarget) {
+            super.validateDataImpl(tenantId, notificationTarget);
+        }
     }
 
 }