Tuya bulbs flashed to OpenBeken
Smart light bulbs were re-flashed to run open firmware so they work without the vendor's cloud.
how it works
tuya-rekey/tuya-beacon tooling, retired after bulbs moved to OpenBeken over MQTT; docs/openbeken-bulbs.md.
Technique: A pattern or hard-won lesson, written down so it isn't learned twice.
The code for this one lives in a private repo. This page explains the idea so you can build your own.