Home Assistant

MQTT Device trigger

The mqtt device trigger platform uses an MQTT message payload to generate device trigger events.

An MQTT device trigger is a better option than a binary sensor for buttons, remote controls etc.

Configuration

MQTT device triggers are only supported through MQTT discovery, manual setup through configuration.yaml is not supported. The discovery topic needs to be: <discovery_prefix>/device_automation/[<node_id>/]<object_id>/config. Note that only one trigger may be defined per unique discovery topic. Also note that the combination of type and subtype should be unique for a device.

Configuration Variables

Looking for your configuration file?
automation_type string Required

The type of automation, must be ‘trigger’.

payload string (Optional)

Optional payload to match the payload being sent over the topic.

qos integer (Optional, default: 0)

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

topic string Required

The MQTT topic subscribed to receive trigger events.

type string Required

The type of the trigger, e.g. button_short_press. Entries supported by the frontend: button_short_press, button_short_release, button_long_press, button_long_release, button_double_press, button_triple_press, button_quadruple_press, button_quintuple_press. If set to an unsupported value, will render as subtype type, e.g. button_1 spammed with type set to spammed and subtype set to button_1

subtype string Required

The subtype of the trigger, e.g. button_1. Entries supported by the frontend: turn_on, turn_off, button_1, button_2, button_3, button_4, button_5, button_6. If set to an unsupported value, will render as subtype type, e.g. left_button pressed with type set to button_short_press and subtype set to left_button

device map Required

Information about the device this device trigger is a part of to tie it into the device registry. 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"]].

identifiers list | string (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.

value_template template (Optional)

Defines a template to extract the value.

Example

This shows a complete example of defining a remote control type device with two triggers: “left arrow click” and “right arrow click”.

Note that it is not necessary to provide the full device information in each message, but the identifying information, identifier in the example, must be the same.

Left arrow click configuration

  • Discovery topic: homeassistant/device_automation/0x90fd9ffffedf1266/action_arrow_left_click/config

  • Discovery payload:

    {
    "automation_type": "trigger",
    "type": "action",
    "subtype": "arrow_left_click",
    "payload": "arrow_left_click",
    "topic": "zigbee2mqtt/0x90fd9ffffedf1266/action",
    "device": {
        "identifiers": [
            "zigbee2mqtt_0x90fd9ffffedf1266"
        ],
        "name": "0x90fd9ffffedf1266",
        "sw_version": "Zigbee2MQTT 1.14.0",
        "model": "TRADFRI remote control (E1524/E1810)",
        "manufacturer": "IKEA"
    }
}

  • Trigger topic: zigbee2mqtt/0x90fd9ffffedf1266/action

  • Trigger payload: arrow_left_click

Right arrow click configuration

  • Discovery topic: homeassistant/device_automation/0x90fd9ffffedf1266/action_arrow_right_click/config

  • Discovery payload:

    {
    "automation_type": "trigger",
    "type": "action",
    "subtype": "arrow_right_click",
    "payload": "arrow_right_click",
    "topic": "zigbee2mqtt/0x90fd9ffffedf1266/action",
    "device": {
        "identifiers": [
            "zigbee2mqtt_0x90fd9ffffedf1266"
        ]
    }
}

  • Trigger topic: zigbee2mqtt/0x90fd9ffffedf1266/action

  • Trigger payload: arrow_right_click