是否有发送到套接字服务器的消息队列？

Question

如果两个设备（智能手机和PC）都在线，则我的Flutter应用程序连接到c＃服务器套接字。

如果服务器套接字处于脱机状态，则Flutter应用会尝试每两秒钟进行连接。

几分钟后重新连接时，将接受连接，但开始时未接收到数据，但几秒钟后一次接收到许多消息。

我试图在2秒超时后销毁客户端套接字（Flutter），但这无济于事。

重新启动应用程序时，一切正常。我丢失了应用程序重启功能是什么？

Future<void> ConnectToPC() async {
    //Called periodically from Timer

    String Sucess = 'Already trying to connect';

    if (!tryingToConnect) {
      try {
        print('Trying to connect to $cardIP on port $cardPort');
        tryingToConnect = true;
        ClientSocket = await Socket.connect(cardIP, int.parse(cardPort))
            .timeout(Duration(seconds: 2));
        print('Socket connected!');
        ClientSocket.listen(HandleIcomingEvents,
            onError: SocketErr, onDone: SocketClose, cancelOnError: false);
        connected = true;
        tryingToConnect = false;
        Sucess = 'Connected';
        cardstate = 'Online';

        //initiate communication, use response for initial stuff
        SendToServer("!GETREADY!\n");
        //Await pong within the specified timeout
        PongReceived = DateTime.now();
        //Start send and check !PING! periodically
        SetPingTimer('ON');
      } on TimeoutException catch (e) {
        print('Timeout');
        tryingToConnect = false;
        Sucess = 'Connection failed';
        if (ClientSocket!=null) ClientSocket.destroy();
      } on OSError {
        print('OS error');
      } on Exception catch (e) {
        print('Socket connection error $e');
        tryingToConnect = false;
        Sucess = 'Connection failed';

        WhenDisconnected();
      }
    }
    setState(() {
      StatusText = Sucess;
    });
  }

  void WhenDisconnected() {
    SetPingTimer('OFF');
    connected = false;
    cardstate = 'Not connected';
    ClientSocket.destroy();
    gotTheJo=false;
    ClientSocket=null;
  }

通过ping发送一次，我还会收到多个“ pong” 等待ClientSocket.add（utf8.encode（TextInhalt））;