I SEND UDP PACKAGE WITH STM32 BUT THE PROTOCOL SHOWNS AS ECHO. WHY?

[KAnahar]

I'm trying to send udp data from stm to server. But when i observe in Wireshark, the protocol shown as ECHO, not UDP. What is the reason?

[Bob S]

UDP is the protocol that you are using, as opposed to TCP. "ECHO" is a particular socket/port number under both UDP and TCP.

[Imen.D]

Hello @KAnahar​ and welcome to the Community :)

Have a look at this Nx_UDP_Echo_Server example working example on STM32H735 board.

Hope this helps you. 

Imen

[LCE]

Wireshark knows most "well known ports" (https://en.wikipedia.org/wiki/List_of_TCP_and_UDP_port_numbers), and port 7 which you are using is the "echo port".

So check the list and choose another port number, or just ignore Wireshark's "extra info".

[KAnahar · Accepted solution]

Thank you my friends. I solve the problem. The problem is due to port 7 conflict. When I changed the port number, the problem was solved.