Status light module for charge manager

[bs-github]

The charge manager may benefit from a status light.

In a load managed scenario, a status light can give visual indication regarding the current situation to users.

There are four (or five) states that would be interesting to know about.

1. There is enough headroom to not being limited while charging. (green)
2. Load management measures are in place, charging may be limited or delayed. (blue)
3. Charging is forbidden at all. (red)
4. The load management setup is in an error state (i.e. not all to be managed wallboxes are responding). (pink)
5. The charge manager is off. (off)

Solution I'd like

There are smart color bulbs available that can easily show the states described above (and more).

I'd wish for a Module that fetches the status of the charge manager periodically and sets the color of a light bulb accordingly.

Alternatives

A full blown display to tell about the status seems too much for the purpose.

Additional context

The Shelly Duo RGBW is widely available and has an easy to use HTTP-API to control it.

[bs-github]

26 added support, but this is still open because

• the status colours are not all done and
• the status still has to be calculated correctly See: https://github.com/Tinkerforge/esp32-firmware/pull/198 and https://github.com/warp-more-hardware/esp32-firmware/pull/26/files#diff-9c27e11ccd5b5326ebe3b33519035513e7904ba1789afc999764e997ea067fc0R180-R190