In the log I saw something like: UDP Init failed: Could not bind socket. Address and port are already in use. network functions won’t work, sorry, what does it mean?

: Log errors

UDP Init failed: Could not bind socket. Address and port are already in use. Network functions won’t work, sorry” in the MoonBot terminal log occurs when you run multiple copies of the MoonBot terminal with the same port number.
To make this disappear, in each MoonBot terminal, add its unique port in the “Listen UPD port:” field at the Settings – Advanced – Remote tab.
for MoonBot1: 1999
for MoonBot2: 1998
for MoonBot3: 1997

and so on.