树莓派 2 服务器没有响应

Question

我已经使用运行 windows 10 IoT 的树莓派 2 启动了一个客户端服务器项目，这非常好，因为您可以在 PC 和 RPI2 上运行相同的应用程序。考虑到这一点，我只创建了一个可以充当客户端和服务器的应用程序，然后我将其部署在两个设备上，并将其中一个用作服务器，另一个用作客户端。唯一的问题是服务器端从不响应客户端的连接调用。

我的代码如下：

服务器：

///servername is the port that I use
///hostadapter is an adapter helper obj that has a HostName property set to my Ip address.
public async void Start(string serverName, HostName hostAdapter)
    {
        //create the "server" object
        serverListener = new StreamSocketListener();
        serverListener.ConnectionReceived += ServerListener_ConnectionReceived;

        try
        {
            await serverListener.BindEndpointAsync(hostAdapter, serverName);
            Started = true;
        }
        catch (Exception ee)
        {
            Started = false;
            myConsole.Print("error while starting server: " + ee.Message);
        }
    }

private async void ServerListener_ConnectionReceived(StreamSocketListener sender, StreamSocketListenerConnectionReceivedEventArgs args)
    {

        myConsole.Print("connection recieved callback called");
        DataReader reader = new DataReader(args.Socket.InputStream);
        DataWriter ServerWriter = new DataWriter(args.Socket.OutputStream);
        string ServerAnswer = "message recieved by server";

        try
        {
            while (true)
            {
                // Read first 4 bytes (length of the subsequent string).
                uint sizeFieldCount = await reader.LoadAsync(sizeof(uint));
                if (sizeFieldCount != sizeof(uint))
                {
                    // The underlying socket was closed before we were able to read the whole data.
                    return;
                }

                // Read the string.
                uint stringLength = reader.ReadUInt32();
                uint actualStringLength = await reader.LoadAsync(stringLength);
                if (stringLength != actualStringLength)
                {
                    // The underlying socket was closed before we were able to read the whole data.
                    return;
                }

                ServerWriter.WriteUInt32(ServerWriter.MeasureString(ServerAnswer));
                ServerWriter.WriteString(ServerAnswer);
                await ServerWriter.StoreAsync();
            }
        }
        catch (Exception exception)
        {
            myConsole.Print(exception.Message);
        }
    }

客户：

public async void Connect(string serverIP, string serverPort)
    {

        try
        {
            ServerHost = new HostName(serverIP);
        }
        catch (Exception ee)
        {
            return;
        }

        try
        {
            //open socket
            ClientSocket = new StreamSocket();
            await ClientSocket.ConnectAsync(ServerHost, serverPort);
            Connected = true;
        }
        catch (Exception ex)
        {
            ClientSocket.Dispose();
            ClientSocket = null;

            myConsole.Print(ex.Message);

            Connected = false;
        }
    }

非常感谢任何帮助。我已经下载了 wireshark 以便能够监控网络数据，并且我已经找到了客户端发送的 tcp [syn] 包，但是我看不到任何 tcp [syn ack] 包。

Answer 1

原来我缺少一项能力。您需要通过以太网进行通信的功能是

<Capabilities>
    <Capability Name="internetClient" />
    <Capability Name="privateNetworkClientServer" />
    <Capability Name="internetClientServer" />
</Capabilities>

我只添加了 privateNetworkClientServer 和 internetClient..