diff --git a/application/src/main/java/org/thingsboard/server/controller/RpcV1Controller.java b/application/src/main/java/org/thingsboard/server/controller/RpcV1Controller.java
index 08ef1a85c8..5e555cbcbe 100644
--- a/application/src/main/java/org/thingsboard/server/controller/RpcV1Controller.java
+++ b/application/src/main/java/org/thingsboard/server/controller/RpcV1Controller.java
@@ -16,6 +16,8 @@
 package org.thingsboard.server.controller;
 
 import io.swagger.v3.oas.annotations.Parameter;
+import io.swagger.v3.oas.annotations.media.Content;
+import io.swagger.v3.oas.annotations.media.Schema;
 import lombok.extern.slf4j.Slf4j;
 import org.springframework.http.HttpStatus;
 import org.springframework.http.ResponseEntity;
@@ -50,7 +52,8 @@ public class RpcV1Controller extends AbstractRpcController {
     public DeferredResult<ResponseEntity> handleOneWayDeviceRPCRequestV1(
             @Parameter(description = DEVICE_ID_PARAM_DESCRIPTION)
             @PathVariable("deviceId") String deviceIdStr,
-            @Parameter(description = "A JSON value representing the RPC request.")
+            @io.swagger.v3.oas.annotations.parameters.RequestBody(description = "A JSON object representing the RPC request.",
+                    content = @Content(mediaType = "text/plain", schema = @Schema(type = "string")))
             @RequestBody String requestBody) throws ThingsboardException {
         return handleDeviceRPCRequest(true, new DeviceId(UUID.fromString(deviceIdStr)), requestBody, HttpStatus.REQUEST_TIMEOUT, HttpStatus.CONFLICT);
     }
@@ -62,7 +65,8 @@ public class RpcV1Controller extends AbstractRpcController {
     public DeferredResult<ResponseEntity> handleTwoWayDeviceRPCRequestV1(
             @Parameter(description = DEVICE_ID_PARAM_DESCRIPTION)
             @PathVariable("deviceId") String deviceIdStr,
-            @Parameter(description = "A JSON value representing the RPC request.")
+            @io.swagger.v3.oas.annotations.parameters.RequestBody(description = "A JSON object representing the RPC request.",
+                    content = @Content(mediaType = "text/plain", schema = @Schema(type = "string")))
             @RequestBody String requestBody) throws ThingsboardException {
         return handleDeviceRPCRequest(false, new DeviceId(UUID.fromString(deviceIdStr)), requestBody, HttpStatus.REQUEST_TIMEOUT, HttpStatus.CONFLICT);
     }
diff --git a/application/src/main/java/org/thingsboard/server/controller/RpcV2Controller.java b/application/src/main/java/org/thingsboard/server/controller/RpcV2Controller.java
index fdcb853343..4366134927 100644
--- a/application/src/main/java/org/thingsboard/server/controller/RpcV2Controller.java
+++ b/application/src/main/java/org/thingsboard/server/controller/RpcV2Controller.java
@@ -17,6 +17,7 @@ package org.thingsboard.server.controller;
 
 import com.google.common.util.concurrent.FutureCallback;
 import io.swagger.v3.oas.annotations.Parameter;
+import io.swagger.v3.oas.annotations.media.Content;
 import io.swagger.v3.oas.annotations.media.Schema;
 import io.swagger.v3.oas.annotations.responses.ApiResponse;
 import io.swagger.v3.oas.annotations.responses.ApiResponses;
@@ -127,7 +128,8 @@ public class RpcV2Controller extends AbstractRpcController {
     public DeferredResult<ResponseEntity> handleOneWayDeviceRPCRequestV2(
             @Parameter(description = DEVICE_ID_PARAM_DESCRIPTION)
             @PathVariable("deviceId") String deviceIdStr,
-            @Parameter(description = "A JSON value representing the RPC request.")
+            @io.swagger.v3.oas.annotations.parameters.RequestBody(description = "A JSON object representing the RPC request.",
+                    content = @Content(mediaType = "text/plain", schema = @Schema(type = "string")))
             @RequestBody String requestBody) throws ThingsboardException {
         return handleDeviceRPCRequest(true, new DeviceId(UUID.fromString(deviceIdStr)), requestBody, HttpStatus.GATEWAY_TIMEOUT, HttpStatus.GATEWAY_TIMEOUT);
     }
@@ -146,7 +148,8 @@ public class RpcV2Controller extends AbstractRpcController {
     public DeferredResult<ResponseEntity> handleTwoWayDeviceRPCRequestV2(
             @Parameter(description = DEVICE_ID_PARAM_DESCRIPTION)
             @PathVariable(DEVICE_ID) String deviceIdStr,
-            @Parameter(description = "A JSON value representing the RPC request.")
+            @io.swagger.v3.oas.annotations.parameters.RequestBody(description = "A JSON object representing the RPC request.",
+                    content = @Content(mediaType = "text/plain", schema = @Schema(type = "string")))
             @RequestBody String requestBody) throws ThingsboardException {
         return handleDeviceRPCRequest(false, new DeviceId(UUID.fromString(deviceIdStr)), requestBody, HttpStatus.GATEWAY_TIMEOUT, HttpStatus.GATEWAY_TIMEOUT);
     }
diff --git a/application/src/main/java/org/thingsboard/server/controller/RuleEngineController.java b/application/src/main/java/org/thingsboard/server/controller/RuleEngineController.java
index ec39bb97aa..d63e0f5d19 100644
--- a/application/src/main/java/org/thingsboard/server/controller/RuleEngineController.java
+++ b/application/src/main/java/org/thingsboard/server/controller/RuleEngineController.java
@@ -17,6 +17,8 @@ package org.thingsboard.server.controller;
 
 import com.google.common.util.concurrent.FutureCallback;
 import io.swagger.v3.oas.annotations.Parameter;
+import io.swagger.v3.oas.annotations.media.Content;
+import io.swagger.v3.oas.annotations.media.Schema;
 import jakarta.annotation.Nullable;
 import lombok.extern.slf4j.Slf4j;
 import org.springframework.beans.factory.annotation.Autowired;
@@ -87,7 +89,8 @@ public class RuleEngineController extends BaseController {
     @RequestMapping(value = "/", method = RequestMethod.POST)
     @ResponseBody
     public DeferredResult<ResponseEntity> handleRuleEngineRequestForUser(
-            @Parameter(description = "A JSON value representing the message.", required = true)
+            @io.swagger.v3.oas.annotations.parameters.RequestBody(description = "A JSON object representing the message.", required = true,
+                    content = @Content(mediaType = "text/plain", schema = @Schema(type = "string")))
             @RequestBody String requestBody) throws ThingsboardException {
         return handleRuleEngineRequestForEntityWithQueueAndTimeout(null, null, null, defaultResponseTimeout, requestBody);
     }
@@ -106,7 +109,8 @@ public class RuleEngineController extends BaseController {
             @PathVariable("entityType") String entityType,
             @Parameter(description = ENTITY_ID_PARAM_DESCRIPTION, required = true)
             @PathVariable("entityId") String entityIdStr,
-            @Parameter(description = "A JSON value representing the message.", required = true)
+            @io.swagger.v3.oas.annotations.parameters.RequestBody(description = "A JSON object representing the message.", required = true,
+                    content = @Content(mediaType = "text/plain", schema = @Schema(type = "string")))
             @RequestBody String requestBody) throws ThingsboardException {
         return handleRuleEngineRequestForEntityWithQueueAndTimeout(entityType, entityIdStr, null, defaultResponseTimeout, requestBody);
     }
@@ -127,7 +131,8 @@ public class RuleEngineController extends BaseController {
             @PathVariable("entityId") String entityIdStr,
             @Parameter(description = "Timeout to process the request in milliseconds", required = true)
             @PathVariable("timeout") int timeout,
-            @Parameter(description = "A JSON value representing the message.", required = true)
+            @io.swagger.v3.oas.annotations.parameters.RequestBody(description = "A JSON object representing the message.", required = true,
+                    content = @Content(mediaType = "text/plain", schema = @Schema(type = "string")))
             @RequestBody String requestBody) throws ThingsboardException {
         return handleRuleEngineRequestForEntityWithQueueAndTimeout(entityType, entityIdStr, null, timeout, requestBody);
     }
@@ -151,7 +156,8 @@ public class RuleEngineController extends BaseController {
             @PathVariable("queueName") String queueName,
             @Parameter(description = "Timeout to process the request in milliseconds", required = true)
             @PathVariable("timeout") int timeout,
-            @Parameter(description = "A JSON value representing the message.", required = true)
+            @io.swagger.v3.oas.annotations.parameters.RequestBody(description = "A JSON object representing the message.", required = true,
+                    content = @Content(mediaType = "text/plain", schema = @Schema(type = "string")))
             @RequestBody String requestBody) throws ThingsboardException {
         try {
             SecurityUser currentUser = getCurrentUser();
diff --git a/application/src/main/java/org/thingsboard/server/controller/TelemetryController.java b/application/src/main/java/org/thingsboard/server/controller/TelemetryController.java
index dc66e4a7b6..754c9253d9 100644
--- a/application/src/main/java/org/thingsboard/server/controller/TelemetryController.java
+++ b/application/src/main/java/org/thingsboard/server/controller/TelemetryController.java
@@ -386,7 +386,8 @@ public class TelemetryController extends BaseController {
                                                                @PathVariable("deviceId") String deviceIdStr,
                                                                @Parameter(description = ATTRIBUTES_SCOPE_DESCRIPTION, schema = @Schema(allowableValues = {"SERVER_SCOPE", "SHARED_SCOPE"}, requiredMode = Schema.RequiredMode.REQUIRED))
                                                                @PathVariable("scope") AttributeScope scope,
-                                                               @io.swagger.v3.oas.annotations.parameters.RequestBody(description = ATTRIBUTES_JSON_REQUEST_DESCRIPTION, required = true)
+                                                               @io.swagger.v3.oas.annotations.parameters.RequestBody(description = ATTRIBUTES_JSON_REQUEST_DESCRIPTION, required = true,
+                                                                       content = @Content(mediaType = "text/plain", schema = @Schema(type = "string")))
                                                                @RequestBody String request) throws ThingsboardException {
         EntityId entityId = EntityIdFactory.getByTypeAndUuid(EntityType.DEVICE, deviceIdStr);
         return saveAttributes(getTenantId(), entityId, scope, request);
@@ -411,7 +412,8 @@ public class TelemetryController extends BaseController {
                                                                  @PathVariable("entityId") String entityIdStr,
                                                                  @Parameter(description = ATTRIBUTES_SCOPE_DESCRIPTION, schema = @Schema(allowableValues = {"SERVER_SCOPE", "SHARED_SCOPE"}))
                                                                  @PathVariable("scope") AttributeScope scope,
-                                                                 @io.swagger.v3.oas.annotations.parameters.RequestBody(description = ATTRIBUTES_JSON_REQUEST_DESCRIPTION, required = true)
+                                                                 @io.swagger.v3.oas.annotations.parameters.RequestBody(description = ATTRIBUTES_JSON_REQUEST_DESCRIPTION, required = true,
+                                                                         content = @Content(mediaType = "text/plain", schema = @Schema(type = "string")))
                                                                  @RequestBody String request) throws ThingsboardException {
         EntityId entityId = EntityIdFactory.getByTypeAndId(entityType, entityIdStr);
         return saveAttributes(getTenantId(), entityId, scope, request);
@@ -436,7 +438,8 @@ public class TelemetryController extends BaseController {
                                                                  @PathVariable("entityId") String entityIdStr,
                                                                  @Parameter(description = ATTRIBUTES_SCOPE_DESCRIPTION, schema = @Schema(allowableValues = {"SERVER_SCOPE", "SHARED_SCOPE"}, requiredMode = Schema.RequiredMode.REQUIRED))
                                                                  @PathVariable("scope") AttributeScope scope,
-                                                                 @io.swagger.v3.oas.annotations.parameters.RequestBody(description = ATTRIBUTES_JSON_REQUEST_DESCRIPTION, required = true)
+                                                                 @io.swagger.v3.oas.annotations.parameters.RequestBody(description = ATTRIBUTES_JSON_REQUEST_DESCRIPTION, required = true,
+                                                                         content = @Content(mediaType = "text/plain", schema = @Schema(type = "string")))
                                                                  @RequestBody String request) throws ThingsboardException {
         EntityId entityId = EntityIdFactory.getByTypeAndId(entityType, entityIdStr);
         return saveAttributes(getTenantId(), entityId, scope, request);
@@ -460,7 +463,8 @@ public class TelemetryController extends BaseController {
             @Parameter(description = ENTITY_TYPE_PARAM_DESCRIPTION, required = true, schema = @Schema(defaultValue = "DEVICE")) @PathVariable("entityType") String entityType,
             @Parameter(description = ENTITY_ID_PARAM_DESCRIPTION, required = true) @PathVariable("entityId") String entityIdStr,
             @Parameter(description = TELEMETRY_SCOPE_DESCRIPTION, required = true, schema = @Schema(allowableValues = "ANY")) @PathVariable("scope") String scope,
-            @io.swagger.v3.oas.annotations.parameters.RequestBody(description = TELEMETRY_JSON_REQUEST_DESCRIPTION, required = true) @RequestBody String requestBody) throws ThingsboardException {
+            @io.swagger.v3.oas.annotations.parameters.RequestBody(description = TELEMETRY_JSON_REQUEST_DESCRIPTION, required = true,
+                    content = @Content(mediaType = "text/plain", schema = @Schema(type = "string"))) @RequestBody String requestBody) throws ThingsboardException {
         EntityId entityId = EntityIdFactory.getByTypeAndId(entityType, entityIdStr);
         return saveTelemetry(getTenantId(), entityId, requestBody, 0L);
     }
@@ -484,7 +488,8 @@ public class TelemetryController extends BaseController {
             @Parameter(description = ENTITY_ID_PARAM_DESCRIPTION, required = true) @PathVariable("entityId") String entityIdStr,
             @Parameter(description = TELEMETRY_SCOPE_DESCRIPTION, required = true, schema = @Schema(allowableValues = "ANY")) @PathVariable("scope") String scope,
             @Parameter(description = "A long value representing TTL (Time to Live) parameter.", required = true) @PathVariable("ttl") Long ttl,
-            @io.swagger.v3.oas.annotations.parameters.RequestBody(description = TELEMETRY_JSON_REQUEST_DESCRIPTION, required = true) @RequestBody String requestBody) throws ThingsboardException {
+            @io.swagger.v3.oas.annotations.parameters.RequestBody(description = TELEMETRY_JSON_REQUEST_DESCRIPTION, required = true,
+                    content = @Content(mediaType = "text/plain", schema = @Schema(type = "string"))) @RequestBody String requestBody) throws ThingsboardException {
         EntityId entityId = EntityIdFactory.getByTypeAndId(entityType, entityIdStr);
         return saveTelemetry(getTenantId(), entityId, requestBody, ttl);
     }
diff --git a/common/data/src/main/java/org/thingsboard/server/common/data/Customer.java b/common/data/src/main/java/org/thingsboard/server/common/data/Customer.java
index 8931e6a270..956cf054dd 100644
--- a/common/data/src/main/java/org/thingsboard/server/common/data/Customer.java
+++ b/common/data/src/main/java/org/thingsboard/server/common/data/Customer.java
@@ -134,7 +134,7 @@ public class Customer extends ContactBased<CustomerId> implements HasTenantId, E
         return super.getPhone();
     }
 
-    @Schema(requiredMode = Schema.RequiredMode.REQUIRED, description = "Email", example = "example@company.com")
+    @Schema(description = "Email", example = "example@company.com")
     @Override
     public String getEmail() {
         return super.getEmail();
diff --git a/common/data/src/main/java/org/thingsboard/server/common/data/Device.java b/common/data/src/main/java/org/thingsboard/server/common/data/Device.java
index cc0b413025..c0c61bc74f 100644
--- a/common/data/src/main/java/org/thingsboard/server/common/data/Device.java
+++ b/common/data/src/main/java/org/thingsboard/server/common/data/Device.java
@@ -176,7 +176,7 @@ public class Device extends BaseDataWithAdditionalInfo<DeviceId> implements HasL
         this.label = label;
     }
 
-    @Schema(requiredMode = Schema.RequiredMode.REQUIRED, description = "JSON object with Device Profile Id.")
+    @Schema(description = "JSON object with Device Profile Id. If not provided, the default device profile will be used.")
     public DeviceProfileId getDeviceProfileId() {
         return deviceProfileId;
     }
diff --git a/common/data/src/main/java/org/thingsboard/server/common/data/DeviceProfileInfo.java b/common/data/src/main/java/org/thingsboard/server/common/data/DeviceProfileInfo.java
index 8bf65873a3..e21b8d3cd0 100644
--- a/common/data/src/main/java/org/thingsboard/server/common/data/DeviceProfileInfo.java
+++ b/common/data/src/main/java/org/thingsboard/server/common/data/DeviceProfileInfo.java
@@ -22,6 +22,7 @@ import lombok.EqualsAndHashCode;
 import lombok.ToString;
 import lombok.Value;
 import org.thingsboard.server.common.data.id.DashboardId;
+import org.thingsboard.server.common.data.id.DeviceProfileId;
 import org.thingsboard.server.common.data.id.EntityId;
 import org.thingsboard.server.common.data.id.EntityIdFactory;
 import org.thingsboard.server.common.data.id.TenantId;
@@ -75,4 +76,10 @@ public class DeviceProfileInfo extends EntityInfo {
                 profile.getType(), profile.getTransportType());
     }
 
+    @Override
+    @Schema(implementation = DeviceProfileId.class, description = "JSON object with the Device Profile Id.")
+    public EntityId getId() {
+        return super.getId();
+    }
+
 }