UDP reader in CVI

Hello everyone,

I need help in writing a small UDP reader and writer in CVI.

I followed the instructions from this post:

http://www.ni.com/example/6723/en/

The UDP writer example worked. But I could not make the UDP reader example worked. 

It seem that the UDPCallback function (when there is data arrived at the UDP port) was never triggered.

Has anyone found a solution for this? 

Thanks,

Quan