Control Iiyama X4071 Brightness with Home Assistant

iiyama_configuration.yaml

binary_sensor:
  - platform: command_line
    name: Monitor Status
    command: ( /bin/echo -en "1048_b{{'%03d'%states.input_number.iiyama.state|int}}{{'\r'}}" > /dev/ttyUSB0 & timeout 2 /bin/cat < /dev/ttyUSB0 | /bin/grep -oP "1048_b" ; /bin/echo "off" ) | head -n 1
    payload_on: "1048_b"
    payload_off: "off"
    scan_interval: 10

input_boolean:
  iiyama:

input_number:
  iiyama:
    min: 0
    max: 100

light:
  - platform: template
    lights:
      iiyama:
        friendly_name: "Monitor"
        icon_template: mdi:television
        value_template: "{{ is_state('binary_sensor.monitor_status', 'on') }}"
        level_template: "{{ (states.input_number.iiyama.state|float/100*255)|int }}"
        turn_on:
          service: input_boolean.turn_on
          entity_id: input_boolean.iiyama
        turn_off:
          service: input_boolean.turn_off
          entity_id: input_boolean.iiyama
        set_level:
          service: input_number.set_value
          data_template:
            value: "{{ brightness/255*100 }}"
            entity_id: input_number.iiyama