07-11-2017 11:35 AM
Yes, you are listening on 1121 and 1122. If the device is sending to port 1124, it will not be seen.
07-18-2017 08:07 AM
My problem was in the IP header checksum.
The NIC card is set for 'IPv4 Checksum Offload - Rx & Tx enabled'. The UDP packets that I was receiving from the PC (LabVIEW) had 0000 for the checksum. Wireshark indicated that the IP checksum was 'disabled'. Header checksum: 0x0000 [validation disabled]
Of course I assumed this was OK for sending packets back to the PC. And Wireshark reported the same information [validation disabled].
When I added the correct checksum to my IP header for packets sent from the DSC, LabVIEW received the packet!
NOTE: I am successfully using 0000 for the UDP checksum, but to do that I have to disable the NIC card's 'UDP Checksum Offload (IPv4).
07-31-2017 03:01 AM
Thank you for the feedback!