MQTT Switch

The mqtt switch platform lets you control your MQTT enabled switches.

In an ideal scenario, the MQTT device will have a state_topic to publish state changes. If these messages are published with a RETAIN flag, the MQTT switch will receive an instant state update after subscription, and will start with the correct state. Otherwise, the initial state of the switch will be false / off.

When a state_topic is not available, the switch will work in optimistic mode. In this mode, the switch will immediately change state after every command. Otherwise, the switch will wait for state confirmation from the device (message from state_topic).

Optimistic mode can be forced, even if the state_topic is available. Try to enable it, if experiencing incorrect switch operation.

To enable this switch in your installation, add the following to your configuration.yaml file:

# Example configuration.yml entry
  - platform: mqtt
    command_topic: "home/bedroom/switch1/set"

Configuration variables:

  • name (Optional): The name of the switch. Default is ‘MQTT Switch’.
  • state_topic (Optional): The MQTT topic subscribed to receive state updates.
  • command_topic (Required): The MQTT topic to publish commands to change the switch state.
  • availability_topic (Optional): The MQTT topic subscribed to receive availability (online/offline) updates.
  • payload_on (Optional): The payload that represents enabled state. Default is “ON”.
  • payload_off (Optional): The payload that represents disabled state. Default is “OFF”.
  • payload_available (Optional): The payload that represents the available state, e.g. ‘online’. Default is “ON”.
  • payload_not_available (Optional): The payload that represents the unavailable state, e.g. ‘offline’. Default is “OFF”.
  • optimistic (Optional): Flag that defines if switch works in optimistic mode. Default is true if no state_topic defined, else false.
  • qos (Optional): The maximum QoS level of the state topic. Default is 0 and will also be used to publishing messages.
  • retain (Optional): If the published message should have the retain flag on or not.
  • value_template (Optional): Defines a template to extract a value from the payload.

Make sure that your topic matches exactly. some-topic/ and some-topic are different topics.


In this section you will find some real life examples of how to use this sensor.

Full configuration

The example below shows a full configuration for a switch.

# Example configuration.yml entry
  - platform: mqtt
    name: "Bedroom Switch"
    state_topic: "home/bedroom/switch1"
    command_topic: "home/bedroom/switch1/set"
    availability_topic: "home/bedroom/switch1/available"
    payload_on: "ON"
    payload_off: "OFF"
    optimistic: false
    qos: 0
    retain: true

For a check you can use the command line tools mosquitto_pub shipped with mosquitto to send MQTT messages. This allows you to operate your switch manually:

$  mosquitto_pub -h -t home/bedroom/switch1 -m "ON"