Handle WS errors.

ui/src/app/api/telemetry-websocket.service.js

@@ -26,7 +26,7 @@ const WS_IDLE_TIMEOUT = 90000;
 const MAX_PUBLISH_COMMANDS = 10;
 
 /*@ngInject*/
-function TelemetryWebsocketService($rootScope, $websocket, $timeout, $window, types, userService) {
+function TelemetryWebsocketService($rootScope, $websocket, $timeout, $window, toast, types, userService) {
 
     var isOpening = false,
         isOpened = false,
@@ -162,7 +162,9 @@ function TelemetryWebsocketService($rootScope, $websocket, $timeout, $window, ty
     function onMessage (message) {
         if (message.data) {
             var data = angular.fromJson(message.data);
-            if (data.subscriptionId) {
+            if (data.errorCode) {
+                showWsError(data.errorCode, data.errorMsg);
+            } else if (data.subscriptionId) {
                 var subscriber = subscribers[data.subscriptionId];
                 if (subscriber && data) {
                     var keys = fetchKeys(data.subscriptionId);
@@ -182,6 +184,16 @@ function TelemetryWebsocketService($rootScope, $websocket, $timeout, $window, ty
         checkToClose();
     }
 
+    function showWsError(errorCode, errorMsg) {
+        var message = 'WebSocket Error: ';
+        if (errorMsg) {
+            message += errorMsg;
+        } else {
+            message += "error code - " + errorCode + ".";
+        }
+        toast.showError(message);
+    }
+
     function fetchKeys(subscriptionId) {
         var command = commands[subscriptionId];
         if (command && command.keys && command.keys.length > 0) {

ui/src/app/common/types.constant.js

@@ -23,7 +23,9 @@ export default angular.module('thingsboard.types', [])
                 permissionDenied: 20,
                 invalidArguments: 30,
                 badRequestParams: 31,
-                itemNotFound: 32
+                itemNotFound: 32,
+                tooManyRequests: 33,
+                tooManyUpdates: 34
             },
             entryPoints: {
                 login: "/api/auth/login",