C#•2y ago

❔ Single UDP Broadcaster to Multiple Clients

I'm trying to have a single UDP Broadcast to many clients. This is what I have working so far. Ideally, I'd like to be able to spin up multiple instances of the Listener and have them receive the message. That is, my Broadcaster sends messages, a single listener can connect and receive, but any additional listeners throws an exception. Broadcaster:

using (var udpClient = new UdpClient { ExclusiveAddressUse = false, EnableBroadcast = true})
{
  var ep = new IPEndPoint(IPAddress.Parse(this._options.BroadcastAddress), this._options.BroadcastPort);
  ... // encodedMessage is created here
  while (true)
  {
    Console.WriteLine($"Broadcasting encoded message:\n {JsonSerializer.Serialize(broadcastMessage)}");
        udpClient.Send(encodedMessage, ep);
  }
}

using (var udpClient = new UdpClient { ExclusiveAddressUse = false, EnableBroadcast = true})
{
  var ep = new IPEndPoint(IPAddress.Parse(this._options.BroadcastAddress), this._options.BroadcastPort);
  ... // encodedMessage is created here
  while (true)
  {
    Console.WriteLine($"Broadcasting encoded message:\n {JsonSerializer.Serialize(broadcastMessage)}");
        udpClient.Send(encodedMessage, ep);
  }
}

Listener:

using (var udpClient = new UdpClient { ExclusiveAddressUse = false, EnableBroadcast = true})
{
  var ep = new IPEndPoint(IPAddress.Parse(this._options.BroadcastAddress), this._options.BroadcastPort);
  this._udpClient.Client.Bind(ep);
  while (true)
  {
    var message = udpClient.Receive(ref ep);
    Console.WriteLine($"Received: {Encoding.Utf8.GetString(message)}");
  }
}

using (var udpClient = new UdpClient { ExclusiveAddressUse = false, EnableBroadcast = true})
{
  var ep = new IPEndPoint(IPAddress.Parse(this._options.BroadcastAddress), this._options.BroadcastPort);
  this._udpClient.Client.Bind(ep);
  while (true)
  {
    var message = udpClient.Receive(ref ep);
    Console.WriteLine($"Received: {Encoding.Utf8.GetString(message)}");
  }
}

3 Replies

DapperDeer•2y ago

The exception that's thrown when trying to spin up additional listeners is:

Unhandled exception. System.Net.Sockets.SocketException (10048): Only one usage of each socket address (protocol/network address/port) is normally permitted.

Unknown User•2y ago

Message Not Public

Accord•2y ago

Was this issue resolved? If so, run /close - otherwise I will mark this as stale and this post will be archived until there is new activity.

Gaming

Programming

❔ Single UDP Broadcaster to Multiple Clients