Windows Phone 8上的UDP多播组

好的，这是我一直试图解决的问题 . 我们在Windows Phone 7上有一个应用程序，其中电话加入多播组，然后向该组发送和接收消息以相互通信 . 注意 - 这是电话到电话的通信 .

现在我正在尝试将此应用程序移植到Windows Phone 8 - 使用Visual Studio 2012中的“转换为电话8”功能 - 到目前为止一切顺利 . 直到我尝试测试手机到手机通讯 . 手机似乎很好地加入了这个组，他们发送的数据报很好 . 他们甚至收到他们发送给小组的消息 - 但是，没有手机从其他手机收到消息 .

以下是我的页面背后的示例代码：

// Constructor
public MainPage()
{
    InitializeComponent();
}

// The address of the multicast group to join.
// Must be in the range from 224.0.0.0 to 239.255.255.255
private const string GROUP_ADDRESS = "224.0.1.1";

// The port over which to communicate to the multicast group
private const int GROUP_PORT = 55562;

// A client receiver for multicast traffic from any source
UdpAnySourceMulticastClient _client = null;

// Buffer for incoming data
private byte[] _receiveBuffer;

// Maximum size of a message in this communication
private const int MAX_MESSAGE_SIZE = 512;

private void PhoneApplicationPage_Loaded(object sender, RoutedEventArgs e)
{
    _client = new UdpAnySourceMulticastClient(IPAddress.Parse(GROUP_ADDRESS), GROUP_PORT);
    _receiveBuffer = new byte[MAX_MESSAGE_SIZE];

    _client.BeginJoinGroup(
        result =>
        {
            _client.EndJoinGroup(result);
            _client.MulticastLoopback = true;
            Receive();
        }, null);
}

private void SendRequest(string s)
{
    if (string.IsNullOrWhiteSpace(s)) return;

    byte[] requestData = Encoding.UTF8.GetBytes(s);

    _client.BeginSendToGroup(requestData, 0, requestData.Length,
        result =>
        {
            _client.EndSendToGroup(result);
            Receive();
        }, null);
}

private void Receive()
{
    Array.Clear(_receiveBuffer, 0, _receiveBuffer.Length);
    _client.BeginReceiveFromGroup(_receiveBuffer, 0, _receiveBuffer.Length,
        result =>
        {
            IPEndPoint source;

            _client.EndReceiveFromGroup(result, out source);

            string dataReceived = Encoding.UTF8.GetString(_receiveBuffer, 0, _receiveBuffer.Length);

            string message = String.Format("[{0}]: {1}", source.Address.ToString(), dataReceived);
            Log(message, false);

            Receive();
        }, null);
}

private void Log(string message, bool isOutgoing)
{
    if (string.IsNullOrWhiteSpace(message.Trim('\0')))
    {
        return;
    }

    // Always make sure to do this on the UI thread.
    Deployment.Current.Dispatcher.BeginInvoke(
    () =>
    {
        string direction = (isOutgoing) ? ">> " : "<< ";
        string timestamp = DateTime.Now.ToString("HH:mm:ss");
        message = timestamp + direction + message;
        lbLog.Items.Add(message);

        // Make sure that the item we added is visible to the user.
        lbLog.ScrollIntoView(message);
    });

}

private void btnSend_Click(object sender, RoutedEventArgs e)
{
    // Don't send empty messages.
    if (!String.IsNullOrWhiteSpace(txtInput.Text))
    {
        //Send(txtInput.Text);
        SendRequest(txtInput.Text);
    }
}

private void btnStart_Click(object sender, RoutedEventArgs e)
{
    SendRequest("start now");
}

为了简单地测试UDP堆栈，我从MSDN中找到了样本here，我在一对Windows Phone 7设备上测试了它，它按预期工作 . 然后我转换到Windows Phone 8并部署到我的手机，设备似乎再次发起连接，用户可以输入他们的名字 . 但是，设备再次无法查看或与其他设备通信 .

最后，我使用新的DatagramSocket实现实现了一个简单的通信测试，我再次看到成功启动，但没有设备间通信 .

这是使用数据报套接字实现的页面后面的相同代码：

// Constructor
public MainPage()
{
    InitializeComponent();
}

// The address of the multicast group to join.
// Must be in the range from 224.0.0.0 to 239.255.255.255
private const string GROUP_ADDRESS = "224.0.1.1";

// The port over which to communicate to the multicast group
private const int GROUP_PORT = 55562;

private DatagramSocket socket = null;

private void Log(string message, bool isOutgoing)
{
    if (string.IsNullOrWhiteSpace(message.Trim('\0')))
        return;

    // Always make sure to do this on the UI thread.
    Deployment.Current.Dispatcher.BeginInvoke(
    () =>
    {
        string direction = (isOutgoing) ? ">> " : "<< ";
        string timestamp = DateTime.Now.ToString("HH:mm:ss");
        message = timestamp + direction + message;
        lbLog.Items.Add(message);

        // Make sure that the item we added is visible to the user.
        lbLog.ScrollIntoView(message);
    });
}

private void btnSend_Click(object sender, RoutedEventArgs e)
{
    // Don't send empty messages.
    if (!String.IsNullOrWhiteSpace(txtInput.Text))
    {
        //Send(txtInput.Text);
        SendSocketRequest(txtInput.Text);
    }
}

private void PhoneApplicationPage_Loaded(object sender, RoutedEventArgs e)
{
    socket = new DatagramSocket();
    socket.MessageReceived += socket_MessageReceived;

    try
    {
        // Connect to the server (in our case the listener we created in previous step).
        await socket.BindServiceNameAsync(GROUP_PORT.ToString());
        socket.JoinMulticastGroup(new Windows.Networking.HostName(GROUP_ADDRESS));
        System.Diagnostics.Debug.WriteLine(socket.ToString());
    }
    catch (Exception exception)
    {
        throw;
    }
}

private async void SendSocketRequest(string message)
{
    // Create a DataWriter if we did not create one yet. Otherwise use one that is already cached.
    //DataWriter writer;
    var stream = await socket.GetOutputStreamAsync(new Windows.Networking.HostName(GROUP_ADDRESS), GROUP_PORT.ToString());
    //writer = new DataWriter(socket.OutputStream);
    DataWriter writer = new DataWriter(stream);

    // Write first the length of the string as UINT32 value followed up by the string. Writing data to the writer will just store data in memory.
   // stream.WriteAsync(
    writer.WriteString(message);

    // Write the locally buffered data to the network.
    try
    {
        await writer.StoreAsync();
        Log(message, true);
        System.Diagnostics.Debug.WriteLine(socket.ToString());
    }
    catch (Exception exception)
    {
        throw;
    }
    finally
    {
        writer.Dispose();
    }
}

void socket_MessageReceived(DatagramSocket sender, DatagramSocketMessageReceivedEventArgs args)
{
    try
    {
        uint stringLength = args.GetDataReader().UnconsumedBufferLength;
        string msg = args.GetDataReader().ReadString(stringLength);

        Log(msg, false);
    }
    catch (Exception exception)
    {
        throw;
    }
}

昨晚我带着手机回家在我的家庭无线网络上测试它们，低，看到我得到了成功的设备通信 .

所以回顾一下 - 我的遗留Windows Phone 7代码在我的工作网络上运行良好 . Windows Phone 8的端口（无实际代码更改）不会发送设备间通信 . 此代码适用于我的家庭网络 . 代码在附加调试器的情况下运行，并且在执行期间没有任何错误或异常的迹象 .

我正在使用的手机是：

Windows Phone 7 - Nokia Lumia 900（* 2），Nokia Lumia 800（* 3）Windows Phone 8 - Nokia Lumia 920（* 1），Nokia Limia 820（* 2）

这些都运行最新的操作系统，并处于开发人员模式 . 开发环境是运行Visual Studio 2012 Professional的Windows 8 Enterprise

我无法告诉你很多关于无线网络的工作 - 除了Phone 7设备没有问题 .

至于我使用的家庭无线网络，这只是一个基本的BT宽带路由器，没有改变“开箱即用”的设置 .

显然，配置两个网络的方式存在问题，但Windows Phone 8实现UDP消息的方式也存在很明显的问题 .

任何输入都会受到赞赏，因为这让我很生气 .