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With the latest versions of the AT commands (from espressif GIT), UDP listening is disabled. You may want to stick with the older versions if you need that.

Documents on Espressif Official BBS show how to create a UDP transmission http://bbs.espressif.com/viewtopic.php?f=21&t=93

Athena wrote::roll:
Documents on Espressif Official BBS show how to create a UDP transmission http://bbs.espressif.com/viewtopic.php?f=21&t=93

I was developing my own fiwmware based on the AT commands provided by espressif. In the latest versions of the project, the UDP Server socket is not allicated with the CIPSERVER command (code is commented out). Only TCP server socket is created. UDP client sockets probably work fine, but UDP server sockets are broken. Older versions were fine.

The latest AT is not open source any more... but it's much better than before..

UDP is created by "AT+CIPSTART" refer to the document.