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RPI remote RPI - ATARI_LIVE - Oct-20-2020

I have two the RASPBERRY PI 4B as 'A' and 'B' on each RPI board.
The 'A' board has a button connected to the GPIO.
The 'B' board has a LED connected to the GPIO.



Both boards are connected with the network with IP address.
I would like to press the button from the board 'A' and the LED go light on from the board 'B'


My question is how do a code for communicate between two boards via the network with socketio or else?

Thank You.