Instructions on how to setup Yeelight Wifi devices within Home Assistant

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+-- Yeelight app      
|   +-- Reset your ceiling light.
|   +-- Adding the Ceiling Light to your Yeelight app
|   +-- ...             enable LAN mode on your lights
|   +-- ...             firmware update
|
+-- Yeelight integration  auto-discovered -> Yeelight Wifi devices can be auto-discovered by HA?
|   +-- org.openhab.binding.airquality
|   +-- org.openhab.binding.astro
|   +-- ...
|
+-- features  Part of the runtime dependency resolver ("Karaf features")
|
+-- Yeelight integration Manual configuration.-Yeelight不支持mDNS自动发现的设备用yeelight integration 手动配置接入
|   +-- org.openhab.binding.astro.tests
|   +-- org.openhab.binding.avmfritz.tests
|   +-- ...
|
+-- src/etc   Auxilary buildsystem files: The license header for automatic checks for example
+-- tools     Static code analyser instructions
|
+-- CODEOWNERS  This file assigns people to directories so that they are informed if a pull-request
                would modify their add-ons.

This problem is most probably due to the fact you did not enable LAN mode on your lights. And that is, because you are not using the Yeelight app. Here is a link explaining everything: