Device tracker: variable interval scan

Feature Requests
2

Home Assistant currently has a service called homeassistant.update_entity (documentation).

It can be used, in an automation, to update an entity’s status independently of the entity’s existing scan_interval.

For example, this automation checks the entity’s status every 5 seconds.

  - alias: 'rainfall_update'
    trigger:
      - platform: time_pattern
        seconds: '/5'
    action:
      - service: homeassistant.update_entity
        entity_id: sensor.rainfall_rate
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