configuration.yaml

 media_player:
 - platform: universal
   name: stb7
   device_class: tv
   commands:
     turn_on:
       service: input_boolean.turn_on
       data: {}
       target:
         entity_id: input_boolean.stb7_state
     turn_off:
       service: input_boolean.turn_off
       data: {}
       target:
         entity_id: input_boolean.stb7_state

     volume_up:
       service: input_number.increment
       data: {}
       target:
         entity_id: input_number.stb7_volume_level
     volume_down:
       service: input_number.decrement
       data: {}
       target:
         entity_id: input_number.stb7_volume_level
     volume_mute:
       service: input_boolean.toggle
       data: {}
       target:
         entity_id: input_boolean.stb7_mute
     volume_set:
       service: input_number.set_value
       data: 
         value: "{{ volume_level }}"
       target:
         entity_id: input_number.stb7_volume_level
     select_source:
       service: input_select.select_option
       data:
         option: "{{ source }}" 
       target:
         entity_id: input_select.stb7_sources
     media_play:
       service: input_text.set_value
       data: 
         value: play
       target:
         entity_id: input_text.stb7_key
     media_stop:
       service: input_text.set_value
       data: 
         value: stop
       target:
         entity_id: input_text.stb7_key
     media_pause:
       service: input_text.set_value
       data: 
         value: pause
       target:
         entity_id: input_text.stb7_key
   attributes:
     state: input_boolean.stb7_state
     volume_level: input_number.stb7_volume_level
     source: input_select.stb7_sources
     media_title: input_select.stb7_sources     
     source_list: input_select.stb7_sources|options
#     media_channel: input_select.stb7_sources
     is_volume_muted: input_boolean.stb7_mute