added curent tb version to the UpdateMessage

application/src/main/java/org/thingsboard/server/service/update/DefaultUpdateService.java

@@ -66,7 +66,7 @@ public class DefaultUpdateService implements UpdateService {
 
     @PostConstruct
     private void init() {
-        updateMessage = new UpdateMessage("", false);
+        updateMessage = new UpdateMessage("", false, "");
         if (updatesEnabled) {
             try {
                 platform = System.getProperty("platform", "unknown");
@@ -124,7 +124,8 @@ public class DefaultUpdateService implements UpdateService {
             JsonNode response = restClient.postForObject(UPDATE_SERVER_BASE_URL+"/api/thingsboard/updates", request, JsonNode.class);
             updateMessage = new UpdateMessage(
                     response.get("message").asText(),
-                    response.get("updateAvailable").asBoolean()
+                    response.get("updateAvailable").asBoolean(),
+                    version
             );
         } catch (Exception e) {
             log.trace(e.getMessage());

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

@@ -25,7 +25,8 @@ public class UpdateMessage {
 
     @ApiModelProperty(position = 1, value = "The message about new platform update available.")
     private final String message;
-    @ApiModelProperty(position = 1, value = "'True' if new platform update is available.")
+    @ApiModelProperty(position = 2, value = "'True' if new platform update is available.")
     private final boolean isUpdateAvailable;
-
+    @ApiModelProperty(position = 3, value = "Current ThingsBoard version.")
+    private final String currentVersion;
 }