Populate MQTT Device Attributes from State

Configuration
1

Greetings,

I’ve manually configured MQTT device. For one of the sensors, I’ve used the device attribute, that allows to add additional information about the device. Is there a way to populate device attributes (e.g. sw_version) using the state of another sensor?

In my case, I’d like to update the ‘sw_version’ using the ‘sensor.tesla_version’.

MQTT YAML:

binary_sensor:
  - name: Health Status
    unique_id: tesla_health
    state_topic: "teslamate/cars/1/healthy"
    payload_on: "true"
    payload_off: "false"
    icon: mdi:heart-pulse
    availability:
      - topic: "teslamate/cars/1/state"
    entity_category: diagnostic
    device:
      name: "Tesla"
      identifiers: tesla_starship
      model: "Model 3"
      manufacturer: "Tesla"
      hw_version: "Full Self-Driving Computer"
      suggested_area: "Outside"

sensor:
  - name: Version
    unique_id: version
    state_topic: "teslamate/cars/1/version"
    entity_category: diagnostic
    icon: mdi:numeric
    device:
      identifiers: tesla_starship

Thanks!

2

I can think of a hack to build a HASS Discovery block of JSON from the version sensor, then publish to MQTT from HASS, which then injests the auto-discovery config and configures the main Tesla entity replacing the local YAML config.

Here’s a mosquitto_pub example to get you started hacking together a proof of concept:

HASS changes immediately on receiving the publish.

Another example:

I’ve published data to MQTT from HASS automations but not discovery - should work as all are just MQTT payloads.

Don’t know if a more Python-esque API-based solution exists though.

If this helps, :heart: this post!

1 Like
3

Thanks @FloatingBoater!

I ended up creating an automation that did the trick:

alias: Update Tesla Attributes
trigger:
  - platform: state
    entity_id:
      - sensor.tesla_version
      - sensor.tesla_model
      - sensor.tesla_trim_badging
      - sensor.tesla_display_name
      - sensor.tesla_last_status_change
      - sensor.tesla_health_status

action:
  - service: mqtt.publish
    data:
      topic: homeassistant/binary_sensor/tesla_health_status/config
      retain: true
      payload: >-
        {
          "name":"Health Status",
          "state_topic":"teslamate/cars/1/healthy",
          "payload_on":"true",
          "payload_off":"false",
          "unique_id":"health_status",
          "icon":"mdi:heart-pulse",
          "entity_category": "diagnostic",
          "device_class": "connectivity",
          "device":{
            "identifiers":["tesla_starship"],
            "connections":[],
            "manufacturer":"Tesla",
            "model":"Model {{ states('sensor.tesla_model') }} ({{ states('sensor.tesla_trim_badging') }})",
            "name":"Tesla",
            "suggested_area": "Outside",
            "sw_version":"{{ states('sensor.tesla_version') }}"
          }
        }
4

Wow - that was a quick hack!

Nice :man_mage: