In my application, I have both TCP and UDP communication, lwip + freeRTOS
(AVR32 project). If I rely on the thread on freeRTOS, I guess I can see
UDP packets in the order of several ms based on the CPU loads.
I'd like to find the quickest way to pre-examine any UDP packet (I don't
care about UDP or other packets), where is the best place to hook such a
piece of codes to eaversdrop?