We published part 1 and part 2 of tutorial that describes how to create CNC machine semaphore (light tower) application with PlanetCNC TNG software.

Part 1:
https://planet-cnc.com/cnc-machine-semaphor-application-using-expressions-expr-txt/


Part 2:
https://planet-cnc.com/cnc-machine-s...pr-txt-part-2/