This repo contains a basic example of UDP communication using the lwIP stack (no RTOS) on a Nucleo-F767ZI board. The folder CubeIDE-F767-UDP-echo/ is a STM32CubeIDE project and contains all the embedded code.
The file UDP_echo.py is a basic Python script that can be used to test the functionality.
Note: The microcontroller assumes that the machine it is communicating to has a static IPv4 address of 192.168.0.11. You can change this (and other things like the port number) in the file main.h. Also, make sure that there are no firewalls/anti-virus softwares blocking the messages being sent and received.