Input_slider & mqqt light

Configuration
1

Hi,
this is certainly a newbie question.
I’ve program my esp8266 to received a number that’ll change the brightness of a strip led. It use the value send by mqqt on pi/lumiere01/brightness. That part works.

I try to add a slider in home assistant to control that light:

light:
  - platform: mqtt
    name: "strip_Led_001"
    command_topic: "pi/lumiere01/brightness"
    brightness_command_topic: "pi/lumiere01/brightness"
    brightness_scale: 1023
    payload_on: 1023
    payload_off: 0

input_slider:
  strip_led_001_brightness:
    name: Plafond Brightness
    initial: 500
    min: 0
    max: 1023
    step: 1

automation:
  - alias: strip_Led_001 - Adjust Brightness
    trigger:
      platform: state
      entity_id: input_slider.strip_led_001_brightness
    action:
      - service: light.turn_on
        data_template:
          entity_id: light.strip_Led_001
          brightness: input_slider.strip_led_001_brightness.state

PS: the switch created by the light works, it send a 1023 on ON and a 0 on OFF. But the slider doesn’t send any mqqt value.

Help me please.