private void ResponseReceived(UdpReceiveResult ar)
{
var bytes = ar.Buffer;
var remote = ar.RemoteEndPoint;
Debug.WriteLine($"P: Received response from {remote.Address}");
var typeBytes = Beacon.Encode(BeaconType).ToList();
Debug.WriteLine(string.Join(", ", typeBytes.Select(_ => (char)_)));
if (Beacon.HasPrefix(bytes, typeBytes))
{
try
{
var portBytes = bytes.Skip(typeBytes.Count()).Take(2).ToArray();
var port = (ushort)IPAddress.NetworkToHostOrder((short)BitConverter.ToUInt16(portBytes, 0));
var payload = Beacon.Decode(bytes.Skip(typeBytes.Count() + 2));
Debug.WriteLine($"P: New beacon {remote.Address},{port}");
NewBeacon(new BeaconLocation(new IPEndPoint(remote.Address, port), payload, DateTime.Now));
}
catch (Exception ex)
{
Debug.WriteLine(ex);
}
}
}
private async Task BroadcastProbeAsync()
{
Debug.WriteLine($"P: Broadcasting probe with discovery port {Beacon.DiscoveryPort}");
var probe = Beacon.Encode(BeaconType).ToArray();
await udp.SendAsync(probe, probe.Length, new IPEndPoint(IPAddress.Broadcast, Beacon.DiscoveryPort));
}