http 응답 검증 로직 추가

Assets/Scripts/UVC/Network/MQTTService.cs

@@ -323,11 +323,13 @@ namespace UVC.network
             string payload = Encoding.UTF8.GetString(message.Payload.Data, message.Payload.Offset, message.Payload.Count);
             ULog.Debug($"MQTT OnTopic {topic.Filter.OriginalFilter} => {payload}");
             ServerLog.LogMqtt(MQTTDomain, MQTTPort.ToString(), topic.Filter.OriginalFilter, payload, DateTime.Now.ToString("yyyy-MM-ddTHH:mm:ss.fffZ"));
-
-            if(topicHandler.TryGetValue(topic.Filter.OriginalFilter, out var handler))
+            if(payload.Trim().Length > 0)
             {
-                // 등록된 핸들러가 있으면 호출
-                handler.Invoke(topic.Filter.OriginalFilter, payload);
+                if (topicHandler.TryGetValue(topic.Filter.OriginalFilter, out var handler))
+                {
+                    // 등록된 핸들러가 있으면 호출
+                    handler.Invoke(topic.Filter.OriginalFilter, payload);
+                }
             }
         }