The mqtt lock platform lets you control your MQTT enabled locks.

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 lock will receive an instant state update after subscription and will start with correct state. Otherwise, the initial state of the lock will be false / unlocked.

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

Optimistic mode can be forced, even if state topic is available. Try to enable it, if experiencing incorrect lock operation.

To enable MQTT locks in your installation, add the following to your configuration.yaml file:

# Example configuration.yaml entry
  - platform: mqtt
    command_topic: "home/frontdoor/set"

Configuration Variables


(string)(Optional)The name of the lock.

Default value: MQTT Lock


(string)(Required)The MQTT topic to publish commands to change the lock state.


(string)(Optional)The MQTT topic subscribed to receive state updates.


(string)(Optional)The payload that represents enabled/locked state.

Default value: LOCK


(string)(Optional)The payload that represents disabled/unlocked state.

Default value: UNLOCK


(string)(Optional)Flag that defines if lock works in optimistic mode.

Default value: true if no state_topic defined, else false.


(integer)(Optional)The maximum QoS level of the state topic.

Default value: 0


(boolean)(Optional)If the published message should have the retain flag on or not.

Default value: false


(string)(Optional)Defines a template to extract a value from the payload.


(string)(Optional)The MQTT topic subscribed to receive availability (online/offline) updates.


(string)(Optional)The payload that represents the available state.

Default value: online


(string)(Optional)The payload that represents the unavailable state.

Default value: offline

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


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

Full configuration

The example below shows a full configuration for a MQTT lock.

# Example configuration.yaml entry
  - platform: mqtt
    name: Frontdoor
    state_topic: "home-assistant/frontdoor/"
    command_topic: "home-assistant/frontdoor/set"
    payload_lock: "LOCK"
    payload_unlock: "UNLOCK"
    optimistic: false
    qos: 1
    retain: true
    value_template: '{{ value.x }}'

Keep an eye on retaining messages to keep the state as you don’t want to unlock your door by accident when you restart something.

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 lock manually:

$  mosquitto_pub -h -t home-assistant/frontdoor/set -m "LOCK"