ESP8266 Community Forum

- Mon Jul 20, 2015 3:37 pm #23747 Hi every body

I just received my new esp boards, and I see that with the new firmware, I cannot launch an UDP server with the AT commands
AT+GMR gives me this :

Code: Select allAT version:0.21.0.0
SDK version:0.9.5


When I start a server with AT+CIPSERVER=1,80
I have only a TCP server
anybody has an idea about this ?
is it normal ? can I start a UDP server ?

- Tue Jul 21, 2015 2:54 pm #23861 Hey,
according to each and every AT command spec I could find (e.g. https://nurdspace.nl/ESP8266#Commands or the one I downloaded right from Espressif the only mention of UDP I can find is connecting to UDP servers (or, technically correct, sending UDP packets) - no UDP server in here. The nurdspace reference even has a "type column" where CIPSERVER is referenced as a TCP/IP function. Maybe you should try out nodemcu or ESP8266 Arduino IDE, from what I've read both feature UDP servers.

- Fri Jan 29, 2021 11:19 pm #90367 So, I know this is an old post, but I was having the same issue and found this resource helpful

https://gist.github.com/mgub/3f4d2f074305d4d84344

Basically, if you want to start a UDP server, use AT+CIPSTART. See below for example.
AT+CIPSTART=0,"UDP","0.0.0.0",4445,4445,2