private static void HandleSegmentationResponse(BacnetClient sender, BacnetAddress adr, byte invoke_id, BacnetMaxSegments max_segments, Action <BacnetClient.Segmentation> transmit)
{
BacnetClient.Segmentation segmentation = sender.GetSegmentBuffer(max_segments);
//send first
transmit(segmentation);
if (segmentation == null || segmentation.buffer.result == System.IO.BACnet.Serialize.EncodeResult.Good)
{
return;
}
//start new thread to handle the segment sequence
System.Threading.ThreadPool.QueueUserWorkItem((o) =>
{
byte old_max_info_frames = sender.Transport.MaxInfoFrames;
sender.Transport.MaxInfoFrames = segmentation.window_size; //increase max_info_frames, to increase throughput. This might be against 'standard'
while (true)
{
bool more_follows = (segmentation.buffer.result & System.IO.BACnet.Serialize.EncodeResult.NotEnoughBuffer) > 0;
//wait for segmentACK
if ((segmentation.sequence_number - 1) % segmentation.window_size == 0 || !more_follows)
{
if (!sender.WaitForAllTransmits(sender.TransmitTimeout))
{
Trace.TraceWarning("Transmit timeout");
break;
}
byte current_number = segmentation.sequence_number;
if (!sender.WaitForSegmentAck(adr, invoke_id, segmentation, sender.Timeout))
{
Trace.TraceWarning("Didn't get segmentACK");
break;
}
if (segmentation.sequence_number != current_number)
{
Trace.WriteLine("Oh, a retransmit", null);
more_follows = true;
}
}
else
{
//a negative segmentACK perhaps
byte current_number = segmentation.sequence_number;
sender.WaitForSegmentAck(adr, invoke_id, segmentation, 0); //don't wait
if (segmentation.sequence_number != current_number)
{
Trace.WriteLine("Oh, a retransmit", null);
more_follows = true;
}
}
if (more_follows)
{
lock (m_lockObject) transmit(segmentation);
}
else
{
break;
}
}
sender.Transport.MaxInfoFrames = old_max_info_frames;
});
}