esphome/tests/components/e131/test.esp8266-ard.yaml

wifi:
  ssid: MySSID
  password: password1

e131:

light:
  - platform: neopixelbus
    name: Neopixelbus Light
    pin: 1
    type: GRBW
    variant: SK6812
    method: ESP8266_UART0
    num_leds: 256
    effects:
      - e131:
          universe: 1