public IAsyncResult BeginReadFileRequest(BacnetAddress adr, BacnetObjectId object_id, int position, uint count, bool wait_for_transmit, byte invoke_id = 0)
{
Trace.WriteLine("Sending AtomicReadFileRequest ... ", null);
if (invoke_id == 0) invoke_id = unchecked(m_invoke_id++);
//encode
EncodeBuffer b = GetEncodeBuffer(m_client.HeaderLength);
NPDU.Encode(b, BacnetNpduControls.PriorityNormalMessage, adr.RoutedSource, null, DEFAULT_HOP_COUNT, BacnetNetworkMessageTypes.NETWORK_MESSAGE_WHO_IS_ROUTER_TO_NETWORK, 0);
APDU.EncodeConfirmedServiceRequest(b, BacnetPduTypes.PDU_TYPE_CONFIRMED_SERVICE_REQUEST | (m_max_segments != BacnetMaxSegments.MAX_SEG0 ? BacnetPduTypes.SEGMENTED_RESPONSE_ACCEPTED : 0), BacnetConfirmedServices.SERVICE_CONFIRMED_ATOMIC_READ_FILE, m_max_segments, m_client.MaxAdpuLength, invoke_id, 0, 0);
Services.EncodeAtomicReadFile(b, true, object_id, position, count);
//send
BacnetAsyncResult ret = new BacnetAsyncResult(this, adr, invoke_id, b.buffer, b.offset - m_client.HeaderLength, wait_for_transmit, m_transmit_timeout);
ret.Resend();
return ret;
}