How does MX_LWIP_PROCESS and udp_recv function work?

Dear all,

I have established ethernet communication successfully using STM32H757i-eval board following this link : https://controllerstech.com/stm32-ethernet-3-udp-client/

But I do not understand how the MX_LWIP_PROCESS and udp_recv work??

And where is the data packet initially stored after receiving it through ethernet.

It would be great if someone could explain it.

Thank you.

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