This is a TwinCAT projed (hence the tc_) to provide a
TCP/IP server on the TwinCAT PLC talking ASCII.
It has been used with EPICS (hence the name).
What is EPICS ? See
https://epics-controls.org
However, the communication, as seen from the PLC, is completely
independent of EPICS (but we couldn't find a better name).
This module may be usable if you want to use telnet to explore
functions inside the PLC.
Or write ASCII based applications in python, c++, java, rust, whatever.
Note that interfacing a PLC today can be done in different ways:
python has pyads,
c++ has the ADS library from Beckhoff,
rust has developped bindings.
So this module is kind of feature complete.
If you want to use it, see
POUs/README.TcPOU