added content format for the CoAP responses

common/transport/coap/src/main/java/org/thingsboard/server/transport/coap/adaptors/CoapTransportAdaptor.java

@@ -49,4 +49,5 @@ public interface CoapTransportAdaptor {
 
     ProvisionDeviceRequestMsg convertToProvisionRequestMsg(UUID sessionId, Request inbound) throws AdaptorException;
 
+    int getContentFormat();
 }

common/transport/coap/src/main/java/org/thingsboard/server/transport/coap/adaptors/JsonCoapAdaptor.java

@@ -23,6 +23,7 @@ import com.google.protobuf.Descriptors;
 import com.google.protobuf.DynamicMessage;
 import lombok.extern.slf4j.Slf4j;
 import org.eclipse.californium.core.coap.CoAP;
+import org.eclipse.californium.core.coap.MediaTypeRegistry;
 import org.eclipse.californium.core.coap.Request;
 import org.eclipse.californium.core.coap.Response;
 import org.springframework.stereotype.Component;
@@ -164,4 +165,8 @@ public class JsonCoapAdaptor implements CoapTransportAdaptor {
         return payload;
     }
 
+    @Override
+    public int getContentFormat() {
+        return MediaTypeRegistry.APPLICATION_JSON;
+    }
 }

common/transport/coap/src/main/java/org/thingsboard/server/transport/coap/adaptors/ProtoCoapAdaptor.java

@@ -23,6 +23,7 @@ import com.google.protobuf.InvalidProtocolBufferException;
 import com.google.protobuf.util.JsonFormat;
 import lombok.extern.slf4j.Slf4j;
 import org.eclipse.californium.core.coap.CoAP;
+import org.eclipse.californium.core.coap.MediaTypeRegistry;
 import org.eclipse.californium.core.coap.Request;
 import org.eclipse.californium.core.coap.Response;
 import org.springframework.stereotype.Component;
@@ -162,4 +163,8 @@ public class ProtoCoapAdaptor implements CoapTransportAdaptor {
         return JsonFormat.printer().includingDefaultValueFields().print(dynamicMessage);
     }
 
+    @Override
+    public int getContentFormat() {
+        return MediaTypeRegistry.APPLICATION_OCTET_STREAM;
+    }
 }

common/transport/coap/src/main/java/org/thingsboard/server/transport/coap/callback/AbstractSyncSessionCallback.java

@@ -17,7 +17,9 @@ package org.thingsboard.server.transport.coap.callback;
 
 import lombok.RequiredArgsConstructor;
 import lombok.extern.slf4j.Slf4j;
+import org.eclipse.californium.core.coap.MediaTypeRegistry;
 import org.eclipse.californium.core.coap.Request;
+import org.eclipse.californium.core.coap.Response;
 import org.eclipse.californium.core.server.resources.CoapExchange;
 import org.thingsboard.server.common.transport.SessionMsgListener;
 import org.thingsboard.server.gen.transport.TransportProtos;
@@ -71,4 +73,11 @@ public abstract class AbstractSyncSessionCallback implements SessionMsgListener
         }
     }
 
+    protected void respond(Response response) {
+        int contentFormat = exchange.getRequestOptions().getContentFormat();
+        contentFormat = contentFormat != MediaTypeRegistry.UNDEFINED ? contentFormat : state.getContentFormat();
+        response.getOptions().setContentFormat(contentFormat);
+        exchange.respond(response);
+    }
+
 }

common/transport/coap/src/main/java/org/thingsboard/server/transport/coap/callback/GetAttributesSyncSessionCallback.java

@@ -34,7 +34,7 @@ public class GetAttributesSyncSessionCallback extends AbstractSyncSessionCallbac
     @Override
     public void onGetAttributesResponse(TransportProtos.GetAttributeResponseMsg msg) {
         try {
-            exchange.respond(state.getAdaptor().convertToPublish(AbstractSyncSessionCallback.isConRequest(state.getAttrs()), msg));
+            respond(state.getAdaptor().convertToPublish(isConRequest(state.getAttrs()), msg));
         } catch (AdaptorException e) {
             log.trace("[{}] Failed to reply due to error", state.getDeviceId(), e);
             exchange.respond(new Response(CoAP.ResponseCode.INTERNAL_SERVER_ERROR));

common/transport/coap/src/main/java/org/thingsboard/server/transport/coap/callback/ToServerRpcSyncSessionCallback.java

@@ -33,7 +33,7 @@ public class ToServerRpcSyncSessionCallback extends AbstractSyncSessionCallback
     @Override
     public void onToServerRpcResponse(TransportProtos.ToServerRpcResponseMsg toServerResponse) {
         try {
-            exchange.respond(state.getAdaptor().convertToPublish(isConRequest(state.getRpc()), toServerResponse));
+            respond(state.getAdaptor().convertToPublish(isConRequest(state.getRpc()), toServerResponse));
         } catch (AdaptorException e) {
             log.trace("Failed to reply due to error", e);
             exchange.respond(CoAP.ResponseCode.INTERNAL_SERVER_ERROR);

common/transport/coap/src/main/java/org/thingsboard/server/transport/coap/client/DefaultCoapClientContext.java

@@ -18,6 +18,7 @@ package org.thingsboard.server.transport.coap.client;
 import lombok.RequiredArgsConstructor;
 import lombok.extern.slf4j.Slf4j;
 import org.eclipse.californium.core.coap.CoAP;
+import org.eclipse.californium.core.coap.MediaTypeRegistry;
 import org.eclipse.californium.core.coap.Response;
 import org.eclipse.californium.core.observe.ObserveRelation;
 import org.eclipse.californium.core.server.resources.CoapExchange;
@@ -330,6 +331,7 @@ public class DefaultCoapClientContext implements CoapClientContext {
             if (state.getConfiguration() == null || state.getAdaptor() == null) {
                 state.setConfiguration(getTransportConfigurationContainer(deviceProfile));
                 state.setAdaptor(getCoapTransportAdaptor(state.getConfiguration().isJsonPayload()));
+                state.setContentFormat(state.getAdaptor().getContentFormat());
             }
             if (state.getCredentials() == null) {
                 state.init(deviceCredentials);
@@ -409,7 +411,7 @@ public class DefaultCoapClientContext implements CoapClientContext {
                 try {
                     boolean conRequest = AbstractSyncSessionCallback.isConRequest(state.getAttrs());
                     Response response = state.getAdaptor().convertToPublish(conRequest, msg);
-                    attrs.getExchange().respond(response);
+                    respond(attrs.getExchange(), response, state.getContentFormat());
                 } catch (AdaptorException e) {
                     log.trace("Failed to reply due to error", e);
                     cancelObserveRelation(attrs);
@@ -440,10 +442,10 @@ public class DefaultCoapClientContext implements CoapClientContext {
                     int requestId = getNextMsgId();
                     Response response = state.getAdaptor().convertToPublish(conRequest, msg);
                     response.setMID(requestId);
-                    attrs.getExchange().respond(response);
                     if (conRequest) {
                         response.addMessageObserver(new TbCoapMessageObserver(requestId, id -> awake(state), id -> asleep(state)));
                     }
+                    respond(attrs.getExchange(), response, state.getContentFormat());
                 } catch (AdaptorException e) {
                     log.trace("[{}] Failed to reply due to error", state.getDeviceId(), e);
                     cancelObserveRelation(attrs);
@@ -503,7 +505,7 @@ public class DefaultCoapClientContext implements CoapClientContext {
                 if (conRequest) {
                     response.addMessageObserver(new TbCoapMessageObserver(requestId, id -> awake(state), id -> asleep(state)));
                 }
-                state.getRpc().getExchange().respond(response);
+                respond(state.getRpc().getExchange(), response, state.getContentFormat());
                 sent = true;
             } catch (AdaptorException e) {
                 log.trace("Failed to reply due to error", e);
@@ -705,4 +707,11 @@ public class DefaultCoapClientContext implements CoapClientContext {
         state.setAdaptor(null);
         //TODO: add optimistic lock check that the client was already deleted and cleanup "clients" map.
     }
+
+    private void respond(CoapExchange exchange, Response response, int defContentFormat) {
+        int contentFormat = exchange.getRequestOptions().getContentFormat();
+        contentFormat = contentFormat != MediaTypeRegistry.UNDEFINED ? contentFormat : defContentFormat;
+        response.getOptions().setContentFormat(contentFormat);
+        exchange.respond(response);
+    }
 }

common/transport/coap/src/main/java/org/thingsboard/server/transport/coap/client/TbCoapClientState.java

@@ -18,26 +18,21 @@ package org.thingsboard.server.transport.coap.client;
 import lombok.Data;
 import lombok.Getter;
 import lombok.Setter;
-import org.eclipse.leshan.server.registration.Registration;
 import org.thingsboard.server.common.data.Device;
 import org.thingsboard.server.common.data.DeviceTransportType;
 import org.thingsboard.server.common.data.device.data.CoapDeviceTransportConfiguration;
 import org.thingsboard.server.common.data.device.data.PowerMode;
 import org.thingsboard.server.common.data.id.DeviceId;
 import org.thingsboard.server.common.data.id.DeviceProfileId;
-import org.thingsboard.server.common.data.id.TenantId;
 import org.thingsboard.server.common.transport.auth.ValidateDeviceCredentialsResponse;
 import org.thingsboard.server.gen.transport.TransportProtos;
 import org.thingsboard.server.transport.coap.TransportConfigurationContainer;
 import org.thingsboard.server.transport.coap.adaptors.CoapTransportAdaptor;
 
-import java.util.ArrayList;
 import java.util.HashMap;
 import java.util.HashSet;
-import java.util.List;
 import java.util.Map;
 import java.util.Set;
-import java.util.UUID;
 import java.util.concurrent.Future;
 import java.util.concurrent.locks.Lock;
 import java.util.concurrent.locks.ReentrantLock;
@@ -55,6 +50,8 @@ public class TbCoapClientState {
     private volatile DefaultCoapClientContext.CoapSessionListener listener;
     private volatile TbCoapObservationState attrs;
     private volatile TbCoapObservationState rpc;
+    private volatile int contentFormat;
+
     private TransportProtos.AttributeUpdateNotificationMsg missedAttributeUpdates;
 
     private DeviceProfileId profileId;

common/transport/lwm2m/src/main/java/org/thingsboard/server/transport/lwm2m/server/LwM2mTransportCoapResource.java

@@ -137,17 +137,17 @@ public class LwM2mTransportCoapResource extends AbstractLwM2mTransportResource {
         );
         UUID currentId = UUID.fromString(idStr);
         Response response = new Response(CoAP.ResponseCode.CONTENT);
-        byte[] fwData = this.getOtaData(currentId);
-        log.debug("Read softWare data (length): [{}]", fwData.length);
-        if (fwData != null && fwData.length > 0) {
-            response.setPayload(fwData);
+        byte[] otaData = this.getOtaData(currentId);
+        log.debug("Read ota data (length): [{}]", otaData.length);
+        if (otaData.length > 0) {
+            response.setPayload(otaData);
             if (exchange.getRequestOptions().getBlock2() != null) {
                 int chunkSize = exchange.getRequestOptions().getBlock2().getSzx();
-                boolean lastFlag = fwData.length <= chunkSize;
+                boolean lastFlag = otaData.length <= chunkSize;
                 response.getOptions().setBlock2(chunkSize, lastFlag, 0);
-                log.trace("With block2 Send currentId: [{}], length: [{}], chunkSize [{}], moreFlag [{}]", currentId.toString(), fwData.length, chunkSize, lastFlag);
+                log.trace("With block2 Send currentId: [{}], length: [{}], chunkSize [{}], moreFlag [{}]", currentId.toString(), otaData.length, chunkSize, lastFlag);
             } else {
-                log.trace("With block1 Send currentId: [{}], length: [{}], ", currentId.toString(), fwData.length);
+                log.trace("With block1 Send currentId: [{}], length: [{}], ", currentId.toString(), otaData.length);
             }
             exchange.respond(response);
         }