internal virtual void HandleFrame(KnxFrame frame)
{
_heartbeatMonitor.Reset();
switch (frame.ServiceType)
{
case KnxHelper.ServiceType.SearchRequest:
break;
case KnxHelper.ServiceType.SearchResponse:
break;
case KnxHelper.ServiceType.DescriptionRequest:
break;
case KnxHelper.ServiceType.DescriptionResponse:
break;
case KnxHelper.ServiceType.ConnectRequest:
break;
case KnxHelper.ServiceType.ConnectResponse:
var connectResponse = (ConnectResponseFrame)frame;
if (connectResponse.IsValid)
{
IndividualAddress = connectResponse.IndividualAddress;
Connected = true;
SetSequenceNumber(0);
ChannelId = connectResponse.ChannelId;
OnConnected?.Invoke(this, EventArgs.Empty);
}
else
{
OnDisconnected?.Invoke(this, EventArgs.Empty);
Connected = false;
}
break;
case KnxHelper.ServiceType.ConnectionstateRequest:
break;
case KnxHelper.ServiceType.ConnectionstateResponse:
break;
case KnxHelper.ServiceType.DisconnectRequest:
SendFrame(new DisconnectResponseFrame(this));
Connected = false;
OnDisconnected?.Invoke(this, EventArgs.Empty);
break;
case KnxHelper.ServiceType.DisconnectResponse:
break;
case KnxHelper.ServiceType.DeviceConfigurationRequest:
break;
case KnxHelper.ServiceType.DeviceConfigurationAck:
break;
case KnxHelper.ServiceType.TunnellingRequest:
var p = (TunnelingRequestFrame)frame;
var ack = new TunnelingAckFrame(this, p.FrameSequenceNumber);
SendFrame(ack);
if (KnxHelper.ProcessCemi(p.Datagram, p.CemiPacket))
{
OnDatagramReceived?.Invoke(this, new KnxDatgramEventArgs(p.Datagram));
}
break;
case KnxHelper.ServiceType.TunnellingAck:
break;
case KnxHelper.ServiceType.RoutingIndication:
break;
case KnxHelper.ServiceType.RoutingLostMessage:
break;
case KnxHelper.ServiceType.SecureWrapper:
break;
case KnxHelper.ServiceType.SessionRequest:
break;
case KnxHelper.ServiceType.SessionResponse:
break;
case KnxHelper.ServiceType.SessionAuthenticate:
break;
case KnxHelper.ServiceType.SessionStatus:
break;
case KnxHelper.ServiceType.TimerNotify:
break;
case KnxHelper.ServiceType.Unknown:
break;
}
}
private void BeginReceiveCallback(object sender, SocketAsyncEventArgs args)
{
if (!IsListening)
{
return;
}
try
{
// No bytes been transferred from this async operation
if (args.BytesTransferred <= 0)
{
DnlDebugger.LogMessage("0 bytes transferred from receive operation: " + args.RemoteEndPoint.ToString() + " | " + args.BytesTransferred, true);
}
else
{
ushort protocolId;
ushort operationCode;
// Parse and validate protocol id and operation code
if ((protocolId = unchecked (BitConverter.ToUInt16(args.Buffer, 0))) != ProtocolId)
{
throw new Exception("Received datagram with different protocol id then expected. Either set your protocol id or ensure network traffic is from known clients.");
}
if (!OperationCodes.ReceivePacket.ContainsKey(operationCode = unchecked (BitConverter.ToUInt16(args.Buffer, 2))))
{
throw new Exception("Received datagram with different unregistered operation code. Either register your operation packet handler or ensure network traffic is from known clients.");
}
int payloadLength = args.BytesTransferred - (sizeof(ushort) * 2);
byte[] payload = new byte[payloadLength];
// Parse payload from datagram
Buffer.BlockCopy(args.Buffer, 4, payload, 0, payloadLength);
// Parse ip and port from endpoint string
string[] systemAddress = !string.IsNullOrEmpty(args.RemoteEndPoint.ToString()) ?
args.RemoteEndPoint.ToString().Split(':') :
throw new Exception("Internal issue trying to parse remote endpoint from incoming datagram. Contact support");
// Invoke the on received event
OnDatagramReceived?.Invoke(this, new DatagramReceivedEventArgs(
systemAddress[0],
int.Parse(systemAddress[1]),
protocolId,
operationCode,
payload,
payload.Length,
DateTime.Now));
}
}
catch (Exception e)
{
DnlDebugger.LogMessage("Caught exception in EndReceive: " + e.Message + " | " + e.TargetSite.ToString(), true);
}
finally
{
args.Dispose();
BeginReceive();
}
}
