It's too difficult to analyze the example udptcp_echo_server_netconnd with stm32f4Discovery. I want to receive the received data buffer and return the desired data. Can I know how to modify the code?

[Imen.D]

Hello @Nhor.1​ and welcome to the STM32 Community 🙂

Have a look at this AN3966 Application note LwIP TCP/IP stack demonstration for STM32F4x7 microcontrollers, the context of understanding the example:

• UM1713 User manual Developing applications on STM32Cube with LwIP TCP/IP stack

Imen