public Led Flick(LedId id)
        {
            Led led = Get(id);

            led?.Flick();

            return(led);
        }
 public Led Get(LedId ledId)
 {
     if (_leds.ContainsKey(ledId))
     {
         return(_leds[ledId]);
     }
     else
     {
         throw new ArgumentException($"{nameof(ledId)}={ledId} is unknown");
     }
 }