MQTT Lock

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

Configuration

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
lock:
  - platform: mqtt
    command_topic: "home/frontdoor/set"

Configuration Variables

availability_topic

(string)(Optional)

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

command_topic

(string)(Required)

The MQTT topic to publish commands to change the lock state.

device

(map)(Optional)

Information about the device this lock is a part of to tie it into the device registry. Only works through MQTT discovery and when unique_id is set.

connections

(list)(Optional)

A list of connections of the device to the outside world as a list of tuples [connection_type, connection_identifier]. For example the MAC address of a network interface: "connections": [["mac", "02:5b:26:a8:dc:12"]].

identifiers

(string | list)(Optional)

A list of IDs that uniquely identify the device. For example a serial number.

manufacturer

(string)(Optional)

The manufacturer of the device.

model

(string)(Optional)

The model of the device.

name

(string)(Optional)

The name of the device.

sw_version

(string)(Optional)

The firmware version of the device.

via_device

(string)(Optional)

Identifier of a device that routes messages between this device and Home Assistant. Examples of such devices are hubs, or parent devices of a sub-device. This is used to show device topology in Home Assistant.

json_attributes_template

(template)(Optional)

Defines a template to extract the JSON dictionary from messages received on the json_attributes_topic. Usage example can be found in MQTT sensor documentation.

json_attributes_topic

(string)(Optional)

The MQTT topic subscribed to receive a JSON dictionary payload and then set as sensor attributes. Usage example can be found in MQTT sensor documentation.

name

(string)(Optional)

The name of the lock.

Default value:

MQTT Lock

optimistic

(string)(Optional)

Flag that defines if lock works in optimistic mode.

Default value:

true if no state_topic defined, else false.

payload_available

(string)(Optional)

The payload that represents the available state.

Default value:

online

payload_lock

(string)(Optional)

The payload that represents enabled/locked state.

Default value:

LOCK

payload_not_available

(string)(Optional)

The payload that represents the unavailable state.

Default value:

offline

payload_unlock

(string)(Optional)

The payload that represents disabled/unlocked state.

Default value:

UNLOCK

qos

(integer)(Optional)

The maximum QoS level of the state topic.

Default value:

retain

(boolean)(Optional)

If the published message should have the retain flag on or not.

Default value:

false

state_locked

(string)(Optional)

The value that represents the lock to be in locked state

Default value:

LOCKED

state_topic

(string)(Optional)

The MQTT topic subscribed to receive state updates.

state_unlocked

(string)(Optional)

The value that represents the lock to be in unlocked state

Default value:

UNLOCKED

unique_id

(string)(Optional)

An ID that uniquely identifies this lock. If two locks have the same unique ID, Home Assistant will raise an exception.

value_template

(string)(Optional)

Defines a template to extract a value from the payload.

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

Examples

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
lock:
  - platform: mqtt
    name: Frontdoor
    state_topic: "home-assistant/frontdoor/"
    command_topic: "home-assistant/frontdoor/set"
    payload_lock: "LOCK"
    payload_unlock: "UNLOCK"
    state_locked: "LOCK"
    state_unlocked: "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 127.0.0.1 -t home-assistant/frontdoor/set -m "LOCK"