As usual I’ll be using a NodeMCU board (I really did order a lot of them) which uses an ESP8266, but there’s no reason this would be difficult to achieve on an Arduino-based device.

If you’re new to the ESP8266, use this quick, handy, guide by [Peter Jennings] to get started with the NodeMCU and Lualoader ... a digital signal from the Arduino Mega on the RAMPS board ...

The course focuses on fundamental concepts and the state-of-the-art of the Internet of Things (IoT), IoT software, sensor signal processing, IoT networking systems, building IoT products using arduino ...