But I later got the idea that a feature rich CNC pendant (like the WHB04B-6) should be possible, too. So it also can read status responses from GRBL to pass the current axis coordinates to the pendant ...

This project allows to control a CNC running GRBL without having to use a pc. This is an alternative to Marlin or Repetier foc CNC. It uses a blue pill board (with a STM32F103 chip) and a 128 X 64 ...