[UWP] DatagramSocket.MessageReceived不会在传入的广播消息上触发 [英] [UWP] DatagramSocket.MessageReceived does not trigger on incoming broadcast messages

问题描述

从我在过去6小时内搜索和尝试的内容来看，这一定是关于这个问题的第100个问题。 （有人甚至使用DatagramSocket吗？）

情况：

1. 具有专用网络（C& S）功能的UWP应用（目标10586-15063）
2. UDP广播发送至"255.255.255.255：7171"由网络中的Python服务（来自端口7070 ）
3. DatagramSocket 从不触发MessageReceived
4. NuGet：System。 Net.Sockets.UdpClient工作得很漂亮但不能使用，因为代码必须使用Unity（HoloLens）

可以使用但无法使用的代码：

 var client = new UdpClient（）; //来自System.Net.Sockets NuGet包
 client.Client.SetSocketOption（SocketOptionLevel.Socket，SocketOptionName.ReuseAddress，true）; 
 client.MulticastLoopback = false; 
 client.EnableBroadcast = true; 
 client.Client.Bind（new IPEndPoint（IPAddress.Any，7171））; 
 
 while（true）
 {
 UdpReceiveResult incoming = await client.ReceiveAsync（）; 
 string message = Encoding.UTF8.GetString（incoming.Buffer）; 
} 

现在是"现代"的DatagramSocket版本完全坏了。
坏了。

 async void Setup（）
 {
 var ds = new DatagramSocket（ ）; 
 ds.MessageReceived + = ds_MessageReceived; 
 
 
 await _Client.BindServiceNameAsync（" 7171"）; //不起作用
 
 //等待_Client.BindEndpointAsync（null，" 7171"）; //不起作用
 
 //等待_Client.ConnectAsync（new HostName（" 255.255.255.255"），" 7070"）; //不起作用
 
 // HostName myname = NetworkInformation.GetHostNames（）。FirstOrDefault（）; 
 // var ep = new EndpointPair（myname，" 7171"，new HostName（" 255.255.255.255"），" 7070"）; 
 //等待_Client.ConnectAsync（ep）; //不起作用（机器名无效）
 
 Debug.WriteLine（" Receiving。"）; 
} 
 
 async void ds_MessageReceived（DatagramSocket sender，DatagramSocketMessageReceivedEventArgs args）
 {
 Debug.WriteLine（" Client_MessageReceived"）; 
} 

我在这里做错了吗？

这是一个知道没有修复的错误，因为没有人甚至使用DatagramSocket？

任何帮助都将不胜感激。

欢呼

$

解决方案

找到解决方案：DatagramSocket 仅在首次发送消息后才开始接收消息！

对于Unity / UWP兼容的UDP广播接收器外观在这里：  https://gist.github.com/michaelosthege/857acac92b8ee689a6bb30d5bf23d9f6

From what I've searched and tried in the past 6 hours, this must be the hundredth question on this problem. (Is anybody even using the DatagramSocket?)

Situation:

1. UWP app with Private Networks (C & S) capability (targeting 10586-15063)
2. UDP broadcast sent to "255.255.255.255:7171" by a Python service in the network (from port 7070)
3. DatagramSocket never triggers MessageReceived
4. NuGet:System.Net.Sockets.UdpClient works beautifully but can't be used since the code has to play with Unity (HoloLens)

The code that works but can't be used:

var client = new UdpClient(); // from System.Net.Sockets NuGet package
client.Client.SetSocketOption(SocketOptionLevel.Socket, SocketOptionName.ReuseAddress, true);
client.MulticastLoopback = false;
client.EnableBroadcast = true;
client.Client.Bind(new IPEndPoint(IPAddress.Any, 7171));

while (true)
{
    UdpReceiveResult incoming = await client.ReceiveAsync();
    string message = Encoding.UTF8.GetString(incoming.Buffer);
}

And now the "modern" DatagramSocket version that is totally broken. So broken.

async void Setup()
{
    var ds = new DatagramSocket();
    ds.MessageReceived += ds_MessageReceived;

    
    await _Client.BindServiceNameAsync("7171");  // doesn't work

    //await _Client.BindEndpointAsync(null, "7171");  // doesn't work

    //await _Client.ConnectAsync(new HostName("255.255.255.255"), "7070");    // doesn't work
                
    //HostName myname = NetworkInformation.GetHostNames().FirstOrDefault();
    //var ep = new EndpointPair(myname, "7171", new HostName("255.255.255.255"), "7070");
    //await _Client.ConnectAsync(ep);  // doesn't work (machine name is not valid)

    Debug.WriteLine("Receiving.");
}

async void ds_MessageReceived(DatagramSocket sender, DatagramSocketMessageReceivedEventArgs args)
{
    Debug.WriteLine("Client_MessageReceived");
}

Is there something I am doing wrong here?

Is this a know bug that just doesn't get fixed because nobody even uses the DatagramSocket?

Any help would be appreciated.

cheers

解决方案

Found the solution: The DatagramSocket only starts to receive messages after it was first used to send!

For Unity/UWP compatible UDP broadcast receiver look here: https://gist.github.com/michaelosthege/857acac92b8ee689a6bb30d5bf23d9f6

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