Chat is done via TMTNET.
A communication system specially made for small systems.
Compare it with RS232 with an address addition.

Each user gives a UserId of 1..63
This UserId is available from me.

Example you are user 33.
And send the letter A to me (address 3)

(Without TX RX handler)

OUT 76.3 ... set address
OUT 77.65 ... send data


I see:


Blue RX WIFI LED lights up.

PRINT INP (76) AND 63 (address minus TX RX bits)

33

PRINT INP (77)

65