private void ReceiveCallback(IAsyncResult ar)
{
UdpState us = (UdpState)(ar.AsyncState);
_logger.LogDebug("Start receive data. AuthId: {0} Server port {1}",
_options.AuthId, _options.Port);
string receiveString;
try
{
byte[] receiveBytes = us.client.EndReceive(ar, ref us.remoteEp);
_logger.LogDebug("Received data. AuthId: {0} Server port {1} Host ip: {2} Host port {3}",
_options.AuthId, _options.Port, us.remoteEp.Address.ToString(), us.remoteEp.Port);
receiveString = Encoding.ASCII.GetString(receiveBytes);
}
catch (Exception e)
{
_logger.LogWarning("Data receive error. AuthId: {0} Server port {1} Sender host: {2} Sender port: {3} Error message: {4}",
_options.AuthId, _options.Port, us.remoteEp.Address.ToString(), us.remoteEp.Port, e.Message);
messageReceived = true;
return;
}
_logger.LogDebug("End receive data. AuthId: {0} Server port {1} Sender host: {2} Sender port: {3} Data: {4}",
_options.AuthId, _options.Port, us.remoteEp.Address.ToString(), us.remoteEp.Port, receiveString);
ExtractData(receiveString, us.remoteEp.Address.ToString(), us.remoteEp.Port);
messageReceived = true;
}
private void ReceiveMessages(CancellationToken cancellationToken)
{
// Receive a message
IPEndPoint LocalEp = new IPEndPoint(IPAddress.Any, _options.Port);
IPEndPoint RemoteEp = new IPEndPoint(IPAddress.Any, 0);
UdpClient udpClient = new UdpClient(LocalEp);
UdpState s = new UdpState
{
localEp = LocalEp,
remoteEp = RemoteEp,
client = udpClient
};
while (true)
{
s.client.BeginReceive(new AsyncCallback(ReceiveCallback), s);
// Do some work while we wait for a message. For this example, we'll just sleep
while (!messageReceived && !cancellationToken.IsCancellationRequested)
{
Thread.Sleep(100);
}
messageReceived = false;
if (cancellationToken.IsCancellationRequested)
{
_logger.LogDebug("Server cancellation request. AuthId: {0} Listening port: {1}", _options.AuthId, _options.Port);
break;
}
}
}
