lua script for the ESP8266 to connect GPIOs to MQTT
I build this to control a 4 channel relay board and receive button presses via MQTT.
Input pins are debounced with a 25ms timer, MQTT topics follow the mqtt-smarthome architecture. Changes on the input pins will be published to e.g. esp1/status/gpio/2 with payload 1 for high and payload 0 for low.
You can just publish 0, 1, true or false to e.g. esp1/set/gpio/3 to switch an output pin. It's also possible to publish a JSON, then the pin is set to the value of the attribute val
Output pins can also be set with a timeout, if you publish {"val": 1, "timeout": 5000} to esp1/set/gpio/3 the gpio 3 will go to high and return to low after 5000ms
Used this article from foobarflies as a starting point.
MIT