Support for changing brightness of dimmer while turned off

[tbertels]

Integration name

Shelly

Link to integration documentation on our website

https://www.home-assistant.io/integrations/shelly

Describe the enhancement

Action to set the brightness of the dimmer without turning it on.

Use cases

Allows to change the brightness of the dimmer before we turn it on.

Anything else?

The dimmers support changing their brightness through REST commands like
http://[dimmer_ip]/light/0?transition=5000&brightness={{ brightness }}

So a workaround is to add this to configuration.yaml:

rest_command:
  dimmer_id:
    url: "http://[dimmer_ip]/light/0?transition=[transition_length from_0_to_5000]&brightness={{ brightness }}" 
    method: put

then to use it in automations:

      - data:
          brightness: "[brightness_from_0_to_100]"
        action: rest_command.[dimmer_id]

[github-actions[bot]]

🏷️ I've automatically added the integration: shelly label to help categorize this feature request.

[farmio]

See also home-assistant/architecture#537