Question

首先，我对网络连接还很陌生，所以请不要对我不礼貌。我的Tcp连接有问题。每当我的设备进入休眠模式（屏幕关闭）时，它不会定期（每5秒发送一次）发送心跳，因此我的服务器认为连接丢失并重新启动。我在这里想念什么？

我注意到，如果没有心跳到达服务器端，则每次我再次打开它时，都会同时到达多个心跳。

我用C＃编写了一个服务器，该服务器接受客户端并每10秒检查一次是否发送了来自客户端的心跳。如果没有，他将断开连接。

    public static void startServer(MainWindow mw)
            {
                //Create Tcp connection
                TcpListener server = new TcpListener(IPAddress.Parse("192.168.192.22"), 8001);
                server.Start();

                //Wait for client
                TcpClient client = server.AcceptTcpClient();

                NetworkStream stream = client.GetStream();

                Byte[] bytes = new Byte[1];

                //keepAlive (first time NOW)
                long lastKeepAlive = DateTime.Now.Ticks / TimeSpan.TicksPerMillisecond;
                while (true)
                {
                    if (stream.DataAvailable)
                    {
                        var readByteCount = stream.Read(bytes, 0, bytes.Length);
                        if (readByteCount > 0)
                        {
                            lastKeepAlive = DateTime.Now.Ticks / TimeSpan.TicksPerMillisecond;
                            var incommingData = new byte[readByteCount];
                            Array.Copy(bytes, 0, incommingData, 0, readByteCount);
                            string serverMessage = Encoding.ASCII.GetString(incommingData);
                            Console.Write(serverMessage);
                        }
                    }

                    //If 10 seconds are over drop connection and start again
                    if (((DateTime.Now.Ticks / TimeSpan.TicksPerMillisecond) - lastKeepAlive) > 10000)
                    {
                        server.Stop();
                        client.Close();
                        startServer(mw);
                        break;
                    }
                }
            }

我的android应用程序是客户端。我使用NotificationListener，所以我认为可以使用此服务而不是使用额外的服务，因此我将在后台运行。我通过gui（广播）启动此方法。

public void startClient() {
        new Thread(new Runnable() {
            @Override
            public void run() {
                try {
                    client = new Socket();
                    client.connect(new InetSocketAddress("192.168.192.22", 8001),  1000);
                    client.setTcpNoDelay(true);
                    client.setKeepAlive(true);
                    client.setSoTimeout(200);
                    in = new BufferedReader(new InputStreamReader(client.getInputStream()));

                    out = new BufferedWriter(new OutputStreamWriter(client.getOutputStream()));

                    //Send heartbeat each 5 seconds
                    task = new Timer();
                    task.scheduleAtFixedRate(new TimerTask() {
                        @Override
                        public void run() {
                            keepAlive();
                        }
                    }, 5000, 5000);//put here time 5000 milliseconds=5 second
                }
                catch (SocketTimeoutException e){
                    Thread.currentThread().interrupt();
                    return;
                } catch (IOException e) {
                    Log.e("error","No I/O");
                }
            }
        }).start();
    }

Android Tcp心跳超时

0 个答案: