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- # Why custom ESPHome firmware?
-
- This lamp could always be added to Home Assistant using the Yeelight
- integration. For this to work, the lamp had to be configured to enable a
- special "LAN control" option, which provides the interface that the Yeelight
- integration could talk to.
-
- January 2021, Xiaomi decided to remove the LAN control option from the
- firmware. Information about this can be found on the Yeelight forums:
-
- https://forum.yeelight.com/t/topic/22664
-
- In the forums, a work-around is offered: by providing your Mi ID, you can be
- added to some mythical white list, through which you'll get a special
- firmware upgrade that does have LAN control enabled. After that, no further
- ugprades should be done.
-
- This just didn't feel right, so I started looking into alternative solutions
- to regain control over the lamp. After opening it up, I was pleased to
- find an ESP32-WROOM-32D chip inside, meaning that it might be possible to
- build my own firmware for it using ESPHome.
-
- On the Home Assistant community forums, I found an existing thread where
- people already started poking at the lamp.
-
- https://community.home-assistant.io/t/hacking-yeelight-fw-enabling-lan-control/284406
-
- I joined the discussion and started poking as well. Some things turned out
- to be more complicated than anticipated and quite a bit of reverse
- engineering was required to make things work, but eventually this all
- resulted in working firmware.
-
- Documents related to the reverse engineering process can be found in a
- separate GitHub repository:
-
- https://github.com/mmakaay/esphome-yeelight_bs2-revengineering
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