MQTT無法連接到服務器時使用3G

當我嘗試在3G連接上運行我的應用程序時，它嘗試連接大約1或2分鐘，然後它會引發異常，它在wifi上運行完全正常，但不在3G上。我嘗試過不同的人在不同的網絡電話。爲什麼不能連接？MQTT無法連接到服務器時使用3G

它拋出一個我MQTT例外

Unable to connect to server

例外這是MQTT類，我把它叫做創建一個新的線程：

public class MQTTService extends Service { 

    ContextWrapper c = this; 
    private MqttClient mqttClient; 

    public IBinder onBind(Intent intent) { 
     return null; 
    } 


    @Override 
public void onStart(Intent intent, int startId) { 

     Thread background = new Thread(new Runnable() { 
      final String BROKER_URL = "tcp://gateway.thebroker.com:1883"; 
      final String clientId = "android-client90"; 

      public void run() { 
       Looper.prepare(); 
       try{ 


        MqttClient mqttClient = new MqttClient(BROKER_URL, clientId, new MemoryPersistence()); 
        MqttConnectOptions opts = new MqttConnectOptions(); 
        opts.setKeepAliveInterval(600); 
        opts.setUserName("nabin"); 
        opts.setPassword("M4rk3r".toCharArray()); 



        Log.e("Before Callback", "Connecting..."); // Code works till here if callback is set then errors galore 
        //mqttClient.setCallback(handler.obtainMessage()); 
        mqttClient.setCallback(new PushCallback(c)); 

        mqttClient.connect(opts); 

         mqttClient.subscribe("house/pill/notification/bad"); 
         mqttClient.subscribe("house/pill/notification/good"); 
         mqttClient.subscribe("house/pill/notification/skip"); 
         mqttClient.subscribe("house/pill/notification/alert"); 
         mqttClient.subscribe("house/pill/notification/snooze"); 
         mqttClient.subscribe("house/pill/schedule/response"); 
         mqttClient.subscribe("house/pill/nextPill/response"); 

         Log.e("CONNECTED!", "COOOONNECTED!!!!!"); 
       }catch(MqttException e){ 
        Log.e("Internet Error", "No connection available " + e.getMessage()); 
       }catch(Exception e){ 
        Log.e("ERRRRRORRRRR ", e.getMessage()); 
       } 
      }   
    }); 
    background.start(); 
    } 
    }

感謝您的幫助！

來源

2014-08-29 mango.nisa