private void OnServerDiscovered(MulticastClient sender, EndpointInformation args)
{
_ = CoreApplication.MainView.Dispatcher.RunAsync(CoreDispatcherPriority.Normal, () =>
{
MessagesListBox.Items.Add($"Discovered {args.Name} at {args.Address}");
});
}
private async Task ReceiveFromAsync(MulticastClient client)
{
while (IsRunning)
{
try
{
var result = await client.Udp.ReceiveAsync();
var message = MessageParser.Decode(result.Buffer);
if (message.Type == MessageType.Query &&
message.Questions.Any(q => q.QType == QType.PTR && q.QName == $"{ServiceType}.{Domain}."))
{
var response = CreateMessage(message.Id, 120, client.Adapter.Ipv4Address);
var packet = MessageParser.Encode(response);
await client.Udp.SendAsync(packet, packet.Length, result.RemoteEndPoint);
}
}
catch (ObjectDisposedException e)
{
if (e.InnerException is TaskCanceledException)
{
}
}
catch (Exception)
{
}
}
}
private Task SendGoodbyeMessage(MulticastClient client)
{
var goodbye = CreateMessage(0, 0, client.Adapter.Ipv4Address);
var data = MessageParser.Encode(goodbye);
_logger.Trace($"Publishing goodbye\n{goodbye}");
return(client.Udp.SendAsync(data, data.Length, Zeroconf.BroadcastEndpoint));
}
protected override async void OnNavigatedTo(NavigationEventArgs e)
{
string localAddress = e.Parameter as string;
client = new MulticastClient();
await client.Bind(localAddress, "224.1.0.0", "9000");
client.ServerDiscovered += OnServerDiscovered;
}
private async Task PublishAsync(MulticastClient client)
{
while (IsRunning)
{
try
{
if (DateTimeOffset.UtcNow > _nextPublishTime)
{
var hello = CreateMessage(0, 120, client.Adapter.Ipv4Address);
var bytes = MessageParser.Encode(hello);
_logger.Trace($"Publishing hello\n{hello}");
await client.Udp.SendAsync(bytes, bytes.Length, Zeroconf.BroadcastEndpoint);
_nextPublishTime = DateTimeOffset.UtcNow + TimeSpan.FromSeconds(110);
}
await Task.Delay(TimeSpan.FromSeconds(9));
}
catch (Exception)
{
}
}
}
