Quick and dirty implementation of a configurable sunrise and sundown timer together with FastLED.h on ESP32.
Just add WIFI_NAME and WIFI_PASSWORD in UserConfig.h before first flash.
For a P9813 controller you can use it as is. You might need to adopt NUM_LEDS, DATA_PIN, CLOCK_PIN. NUM_LEDS corresponds to the P9813 controller chain length.
In PlatformIO run the "Upload File System Image" prior to first boot. It will add the main Web page to the storage. After successfull build it will be available if you navigate to the ip of your ESP32.