I have four Arduino Shield connected to a LAN Switch. Each sends out a “Hello Jane” message. LAN Switch is connected to my PC. I need to save the data / message from each Arduino in separate folders on my PC. Kindly help with Python script / code.

I am trying to generate Message authentication code (MAC) based on a given key and mac+data file in order to verify message integrity. I tried to do it via the following method. However, the MAC generated does not seem to match. How is my method wrong?