Multi Relay Devices - digiblur/Tasmota GitHub Wiki

Dual Relay Switch (Sonoff Dual, Dual Relay Smart Plugs, Shelly2, etc)

Copy the below example into configuration.yaml under the light or switch group depending on your use case. You can only have one switch group and one light group in the configuration.

switch:
  - platform: mqtt
    name: "Sonoff Dual A"
    state_topic: "stat/sonoff/POWER1"
    command_topic: "cmnd/sonoff/POWER1"
    availability_topic: "tele/sonoff/LWT"
    qos: 1
    payload_on: "ON"
    payload_off: "OFF"
    payload_available: "Online"
    payload_not_available: "Offline"

  - platform: mqtt
    name: "Sonoff Dual B"
    state_topic: "stat/sonoff/POWER2"
    command_topic: "cmnd/sonoff/POWER2"
    availability_topic: "tele/sonoff/LWT"
    qos: 1
    payload_on: "ON"
    payload_off: "OFF"
    payload_available: "Online"
    payload_not_available: "Offline"

Use POWER<x> when you are using a device with more than one relay (if SetOption26 is on you will also use POWER1 even if only one relay exists)