Yet another custom code to control Sonoff and other custom relay boards built around ESP8266 and ESP32.

The main goals are:

• Universal for Sonoff and other custom maed relay boards with ESP8266 and ESP32
• All setting is in one file so you have one file for each device but with completely different behaviour
• Button reading is interrupt based debounce, so you really don't miss a click even with delay used somewhere in code
• Button has a short press and long press
• You can define how many relays it has, also what is ON state wheter LOW or HIGH
• Different modes state LED indication
• Remember last state during restart
• Clearly MQTT controlled, ready to be controlled by Home Automation server, like HomeAssistant

In order to compile, you need to install following library

• PubSubClient (Imroy version) https://github.com/Imroy/pubsubclient

Below are examples of HomeAssistant configuration

switch:
  - platform: mqtt
    name: "sonoff_switch"
    command_topic: "sonoff/relay0"
    state_topic: "sonoff/relay0/state"
    payload_on: 'ON'
    payload_off: 'OFF'
    optimistic: false
    qos: 1

sensor:
  - platform: mqtt
    state_topic: "sonoff/temp0"
    name: "Tepmerature 1"
    unit_of_measurement: "°C"
  - platform: mqtt
    state_topic: "sonoff/temp1"
    name: "Tepmerature 2"
    unit_of_measurement: "°C"

sensor:
  - platform: mqtt
    state_topic: "sonoff/temp"
    name: "Tepmerature"
    unit_of_measurement: "°C"
  - platform: mqtt
    state_topic: "sonoff/humidity"
    name: "Humidity"
    unit_of_measurement: "%"