Blaž Kristan

What happens if first bus is not RMT driven? (AKA APA102 LEDs which use SPI)

All this assuming you **know** how much each LED consumes. Which yo don't. You can use datasheet to get an average but THAT may still be off. And it may...

Use GPIO 2 if possible (or 1 oe 3).

GPIO2 (and 1 & 3) are hardware accelerated.

Have you tried erasing flash prior to uploading firmware?

The error above usually means null pointer. As a lot of testing has been done that would possibly mean unusual set-up. Please post your cfg.json and, if applicable, preset in...

nothing unusual. almost same as my test set-up.

Use debug build and monitor serial output. If you have any "smart" devices on your network try disconnecting them. HA was known to cause issues in certain configurations.

Any progress?

This is Hyperion thing or issue if you want. Due to the fact that Hyperion sets WLED to receive "live"/realtime data indefinitely. Normally if you exit Hyperion it should send...