diff --git a/Assets/Scripts/Studio/Connect/TemporaryMQTTClient.cs b/Assets/Scripts/Studio/Connect/TemporaryMQTTClient.cs
index 37fbeb34..8610240c 100644
--- a/Assets/Scripts/Studio/Connect/TemporaryMQTTClient.cs
+++ b/Assets/Scripts/Studio/Connect/TemporaryMQTTClient.cs
@@ -15,13 +15,15 @@ namespace Studio.Connection
         string domain;
         int port;
         List<string> topics;
-        Action<string, string> callback;
-        public TemporaryMQTTClient(string domain, int port, List<string> topic, Action<string, string> callback)
+        Action<string, string> topicCallback;
+        Action disconnectCallback;
+        public TemporaryMQTTClient(string domain, int port, List<string> topic, Action<string, string> topicCallback, Action disconnectCallback)
         {
             this.domain = domain;
             this.port = port;
             this.topics = topic;
-            this.callback = callback;
+            this.topicCallback = topicCallback;
+            this.disconnectCallback = disconnectCallback;
             var optionBuilder = new ConnectionOptionsBuilder()
             .WithTCP(domain, port)
             .Build();
@@ -44,7 +46,7 @@ namespace Studio.Connection
         {
             string payload = Encoding.UTF8.GetString(message.Payload.Data, message.Payload.Offset, message.Payload.Count);
             Debug.Log($"Temporary MQTT is OnTopic. {ToString()}, msg={payload}");
-            callback(topicName, payload);
+            topicCallback(topicName, payload);
 
             this.topics.Remove(topicName);
             client.CreateUnsubscribePacketBuilder(topicName)
@@ -66,12 +68,14 @@ namespace Studio.Connection
 
         private void OnErrorMQTT(MQTTClient client, string error)
         {
+            disconnectCallback();
             Debug.Log($"Temporary MQTT Client Error. {ToString()}, error={error}");
             //Disconnect();
         }
 
         private void OnDisconnectedMQTT(MQTTClient client, DisconnectReasonCodes reasonCode, string reasonMessage)
         {
+            disconnectCallback();
             Debug.Log($"Temporary MQTT Client Disconnected. {ToString()}, reason={reasonCode}, msg={reasonMessage}");
         }
 
diff --git a/Assets/Scripts/Studio/UI/Elements/UI_MQTTConnection.cs b/Assets/Scripts/Studio/UI/Elements/UI_MQTTConnection.cs
index be43354d..0d281c18 100644
--- a/Assets/Scripts/Studio/UI/Elements/UI_MQTTConnection.cs
+++ b/Assets/Scripts/Studio/UI/Elements/UI_MQTTConnection.cs
@@ -21,6 +21,8 @@ namespace Studio.UI
         private Button Button_Remove;
         private RectTransform TopicItemContent;
         private RectTransform AddTopic;
+        private Image Image_Check;
+        private Sprite connectedSprite, errorSprite;
 
         private UI_InputTopicItem prf_InputTopicItem;
         private List<UI_InputTopicItem> inputTopicItems = new List<UI_InputTopicItem>();
@@ -63,7 +65,7 @@ namespace Studio.UI
                 var topic = item.InputField_Topic.text;
                 topics.Add(topic);
             }
-            var tmpClient = new TemporaryMQTTClient(domain, port, topics, OnTopicTest);
+            var tmpClient = new TemporaryMQTTClient(domain, port, topics, OnTopicTest, OnDisconnectClient);
             panel_MQTTTestResult.Open(domain, port.ToString());
         }
 
@@ -77,8 +79,12 @@ namespace Studio.UI
                 payload = payload
             };
             panel_MQTTTestResult.AddResult(result);
+            Image_Check.sprite = connectedSprite;
+        }
+        void OnDisconnectClient()
+        {
+            Image_Check.sprite = errorSprite;
         }
-
         private void OnClickRemoveItemButton()
         {
             onRemoveMQTTConnectionItem?.Invoke(this);