Home Assistant

MQTT button

The mqtt button platform lets you send an MQTT message when the button is pressed in the frontend or the button press service is called. This can be used to expose some service of a remote device, for example reboot.

Configuration

# Example configuration.yaml entry
mqtt:
  - button:
      command_topic: "home/bedroom/switch1/reboot"

Configuration Variables

Looking for your configuration file?
availability list (Optional)

A list of MQTT topics subscribed to receive availability (online/offline) updates. Must not be used together with availability_topic.

payload_available string (Optional, default: online)

The payload that represents the available state.

payload_not_available string (Optional, default: offline)

The payload that represents the unavailable state.

topic string Required

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

value_template template (Optional)

Defines a template to extract device’s availability from the topic. To determine the devices’s availability result of this template will be compared to payload_available and payload_not_available.

availability_mode string (Optional, default: latest)

When availability is configured, this controls the conditions needed to set the entity to available. Valid entries are all, any, and latest. If set to all, payload_available must be received on all configured availability topics before the entity is marked as online. If set to any, payload_available must be received on at least one configured availability topic before the entity is marked as online. If set to latest, the last payload_available or payload_not_available received on any configured availability topic controls the availability.

availability_template template (Optional)

Defines a template to extract device’s availability from the availability_topic. To determine the devices’s availability result of this template will be compared to payload_available and payload_not_available.

availability_topic string (Optional)

The MQTT topic subscribed to receive availability (online/offline) updates. Must not be used together with availability.

command_template template (Optional)

Defines a template to generate the payload to send to command_topic.

command_topic string (Optional)

The MQTT topic to publish commands to trigger the button.

device map (Optional)

Information about the device this button is a part of to tie it into the device registry. Only works when unique_id is set. At least one of identifiers or connections must be present to identify the device.

configuration_url string (Optional)

A link to the webpage that can manage the configuration of this device. Can be either an http://, https:// or an internal homeassistant:// URL.

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"]].

hw_version string (Optional)

The hardware version of the device.

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.

serial_number string (Optional)

The serial number of the device.

suggested_area string (Optional)

Suggest an area if the device isn’t in one yet.

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.

device_class device_class (Optional)

The type/class of the button to set the icon in the frontend. The device_class can be null.

enabled_by_default boolean (Optional, default: true)

Flag which defines if the entity should be enabled when first added.

encoding string (Optional, default: utf-8)

The encoding of the published messages.

entity_category string (Optional)

The category of the entity.

icon icon (Optional)

Icon for the entity.

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, default: MQTT Button)

The name to use when displaying this button. Can be set to null if only the device name is relevant.

object_id string (Optional)

Used instead of name for automatic generation of entity_id

payload_available string (Optional, default: online)

The payload that represents the available state.

payload_not_available string (Optional, default: offline)

The payload that represents the unavailable state.

payload_press string (Optional, default: PRESS)

The payload To send to trigger the button.

qos integer (Optional, default: 0)

The maximum QoS level to be used when receiving and publishing messages.

retain boolean (Optional, default: false)

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

unique_id string (Optional)

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

Make sure that your topic matches 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 feature.

Full configuration

The example below shows a full configuration for a button.

# Example configuration.yaml entry
mqtt:
  - button:
      unique_id: bedroom_switch_reboot_btn
      name: "Restart Bedroom Switch"
      command_topic: "home/bedroom/switch1/commands"
      payload_press: "restart"
      availability:
        - topic: "home/bedroom/switch1/available"
      qos: 0
      retain: false
      entity_category: "config"
      device_class: "restart"