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Windows Service with UDP

Posted on 2016-11-07
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Last Modified: 2016-11-07
I need to create a Windows Service to receive connections UDP and send a command back to server.


I have this code

protected override void OnStart(string[] args)
{
  _mStarted = true;
  _mWorkReceberComando = new Thread(ReceberComando);
  _mWorkReceberComando.Name = "Recebimento Comando";
  _mWorkReceberComando.Start();
}

 private void ReceberComando()
    {
        _endPoint = new IPEndPoint(IPAddress.Any, _port);
        var udpClient = new UdpClient(_endPoint);
        while (_mStarted)
        {
            var remoteEp = new IPEndPoint(IPAddress.Any, 0);
            var data = udpClient.Receive(ref remoteEp);

            var receivedString = BitConverter.ToString(data);

            var comandoByte = new ObterComandocAck(receivedString);
            var ipEndereco = remoteEp.Address;

            udpClient.Connect(ipEndereco.ToString(), _port);
            udpClient.Send(comandoByte, comandoByte.Length);

            Console.WriteLine(receivedString); 
        }
    }

Open in new window


I'm receiving this erro:

An existing connection was forcibly closed by the remote host

HYRESULT -2147467259
0
Comment
Question by:berechit
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2 Comments
 
LVL 40

Accepted Solution

by:
Kyle Abrahams earned 2000 total points
ID: 41877889
Did you verify you can connect to the port manually?

Before creating the service I would create  a console application that essentially does the same thing.
Step thru and find out where it's erroring.

Based on that error message the the client doesn't like the connection for some reason.  (Firewall?)
0
 

Author Comment

by:berechit
ID: 41878177
Hi Kyle,

Yes I did.

I'm need to connect to a GPS tracker and that need to open the connection first then I need to send the response in the same connection.

I've changed code to this:

private void ReceberComando()
    {
        _endPoint = new IPEndPoint(IPAddress.Any, _port);
        var udpClient = new UdpClient(_endPoint);
        while (_mStarted)
        {
            var remoteEp = new IPEndPoint(IPAddress.Any, 0);
            var data = udpClient.Receive(ref remoteEp);

            var receivedString = BitConverter.ToString(data);

            var comandoByte = new ObterComandocAck(receivedString);
            var ipEndereco = remoteEp.Address;

            udpClient.Connect(ipEndereco.ToString(), _port);
            udpClient.Send(comandoByte, comandoByte.Length,remoteEp  );

            Console.WriteLine(receivedString); 
        }
    }

Open in new window


Thanks for your help.
0

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