GaggiMate: an open-source espresso machine smart control (PID and more)

Learned about it from this YouTube video: https://youtu.be/h2yZYcOFACQ

It was mentioned this project aims to support more espresso machines (beyond Gaggia Classic and Rancilio Silvia) in the future, including machines with a thermal block instead of a boiler (e.g. Sage/Breville Barista Express).