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

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

{% configuration %} name: description: The name of the lock. required: false type: string default: MQTT Lock command_topic: description: The MQTT topic to publish commands to change the lock state. required: true type: string state_topic: description: The MQTT topic subscribed to receive state updates. required: false type: string payload_lock: description: The payload that represents enabled/locked state. required: false type: string default: LOCK payload_unlock: description: The payload that represents disabled/unlocked state. required: false type: string default: UNLOCK optimistic: description: Flag that defines if lock works in optimistic mode. required: false type: string default: "true if no state_topic defined, else false." qos: description: The maximum QoS level of the state topic. required: false type: integer default: 0 retain: description: If the published message should have the retain flag on or not. required: false type: boolean default: false value_template: description: "Defines a template to extract a value from the payload." required: false type: string availability_topic: description: The MQTT topic subscribed to receive availability (online/offline) updates. required: false type: string payload_available: description: The payload that represents the available state. required: false type: string default: online payload_not_available: description: The payload that represents the unavailable state. required: false type: string default: offline {% endconfiguration %}

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

{% linkable_title Examples %}

In this section you will 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"