home-assistant.io/source/_components/lock.mqtt.markdown

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layout	title	description	date	sidebar	comments	sharing	footer	logo	ha_category	ha_release	ha_iot_class
page	MQTT Lock	Instructions how to integrate MQTT locks into Home Assistant.	2016-02-28 15:00	true	false	true	true	mqtt.png	Lock	0.15	depends

The mqtt lock platform let 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 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.yml entry
lock:
  - platform: mqtt
    command_topic: "home/frontdoor/set"

Configuration variables:

• command_topic (Required): The MQTT topic to publish commands to change the lock state.
• name (Optional): The name of the lock. Default is 'MQTT Lock'.
• state_topic (Optional): The MQTT topic subscribed to receive state updates.
• payload_lock (Optional): The payload that represents enabled/locked state. Default is "LOCK".
• payload_unlock (Optional): The payload that represents disabled/unlocked state. Default is "UNLOCK".
• optimistic (Optional): Flag that defines if lock 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 match exact. `some-topic/` and `some-topic` are different topics.

{% linkable_title Examples %}

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

{% linkable_title Full configuration %}

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

# Example configuration.yml entry
lock:
  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: '{% raw %}{{ value.x }}{% endraw %}'

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 127.0.0.1 -t home-assistant/frontdoor/set -m "LOCK"