My test with snip.udp_transmit looks fine.
You should double check with the snip code to verify if it's sdk issue or other issues in your own code.
Well, I tested on FreeRTOS+LwIP build only. I don't use NetX_Duo.
Thanks for valuable responce,
I test with snip.config but it not able to configure wifi module with router,
uninstalling the Wiced 3.5.2 and reinstall then download and run my code , it is working fine. also the snip.config working well.