The general idea is pretty simple, the big physical button on the top of the device resets the internal ESP8266, which is programmed to connect to his home WiFi and send a signal to his MQTT server.

Hackaday.io user [stopsendingmejunk] is working on an ESP8266-based IFTTT Button based on a simple breakout board so that anyone could rebuild it without having to do any soldering, and he’s ...