If you’ve never done so, stepping up to the ESP32 is going to be a bit of a learning experience. We’ll cover FreeRTOS and some of its programming conventions as they apply to the ESP32 next time.

Plus the Arduino needs to be plugged into the host computer via USB to function, a rather quaint idea to many in 2018. These were just some of the reasons he decided to port Grbl to the ESP32 board.