Dear forumers,
I found on Github very usfull communication protocols
C++ libraries.
For example:
Profinet used to connect all siemens modern devices throught TCP-IP
CAN interface is also often used
IO-Link as for me i don't have experiance.
If somebody interested in widening of possibilities of linuxcnc and also has correspondent experiance (because my experiance in programming is very weak), could make something interesting.