IDEA: using onboard LED for status display

[c64emulator]

The S3 mini has a onboard LED. According to the schematic its a WS2812B-0807, controlled via IO47.
It would be handy to use this resource for status display. Especially during first setup this may help a lot.
Suggestion:

• Buildin_LED-power: LED On / Off for current state
• Buildin_LED-state (idea):

Color	Description
--	use of LED disabled
green-blink	Show power state and MQTT messages as a led blink
cyan	Access Point Mode, pls configure WiFi
orange	MQTT-Server not available
magenta	NTP not available

[JanPetterMG]

I’ve put together an implementation here: #558

It follows the same general idea of using an LED for status indication, but takes a simpler approach with a basic on/off LED rather than RGB.

The main reason is availability. A single-color LED—either onboard or external—is something most setups can support without additional requirements, while RGB LEDs aren’t as consistently present. This keeps the feature broadly usable out of the box.

This is also aligned with how ESPHome approaches its “status LED”, focusing on simple, low-level feedback.

In this implementation, the LED is solid during normal operation, blinks slowly on warnings (e.g. Wi-Fi or MQTT connectivity issues), and blinks rapidly on errors.