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        time.sleep(1)
        link.Write((90, 0, *LASER_RGB_OFF))
        time.sleep(1)
        link.Write((180, 0, *LASER_RGB_OFF))
        time.sleep(1)
        link.Write((270, 0, *LASER_RGB_OFF))

      new_flight = DifferentFlights(flight, last_flight)
      if new_flight:
        Log('Flight changed from %s to %s' % (
            messageboard.DisplayFlightNumber(last_flight),
            messageboard.DisplayFlightNumber(flight)
        ), ser=link)

        # Turn off laser so that line isn't traced while it moves to new position
        link.Write((*last_angles, *LASER_RGB_OFF))

      last_flight = flight

    if time.time() >= next_read:
      link.Read()  # simple ack message sent by servos
      next_read = time.time() + READ_DELAY_TIME


    now = GetNow(json_desc_dict, additional_attr)

    current_angles = AzimuthAltitude(flight, now)
    if current_angles and time.time() > next_write:
      if current_angles[1] >= configuration['minimum_altitude_servo_tracking']:
        Log('Flight #: %s current_angles: %s' % (
            messageboard.DisplayFlightNumber(flight), str(current_angles)))
        flight_present = True
        laser_rgb = LaserRGBFlight(flight)
        link.Write((*current_angles, *laser_rgb))
        last_angles = current_angles

      # flight no longer tracked; send one more command to turn off lasers
      elif flight_present:
        link.Write((*last_angles, *LASER_RGB_OFF))
        flight_present = False

      next_write = time.time() + WRITE_DELAY_TIME





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        time.sleep(1)
        link.Write((90, 0, *LASER_RGB_OFF))
        time.sleep(1)
        link.Write((180, 0, *LASER_RGB_OFF))
        time.sleep(1)
        link.Write((270, 0, *LASER_RGB_OFF))

      new_flight = DifferentFlights(flight, last_flight)
      if new_flight:
        Log('Flight changed from %s to %s' % (
            messageboard.DisplayFlightNumber(last_flight),
            messageboard.DisplayFlightNumber(flight)
        ), ser=link)

        # Turn off laser so that line isn't traced while it moves to new position
        link.Write((*last_angles, *LASER_RGB_OFF))

      last_flight = flight

    if time.time() >= next_read:
      heartbeat = link.Read()  # simple ack message sent by servos
      next_read = time.time() + READ_DELAY_TIME
      Log(heartbeat)

    now = GetNow(json_desc_dict, additional_attr)

    current_angles = AzimuthAltitude(flight, now)
    if current_angles and time.time() > next_write:
      if current_angles[1] >= configuration['minimum_altitude_servo_tracking']:
        Log('Flight #: %s current_angles: %s' % (
            messageboard.DisplayFlightNumber(flight), str(current_angles)))
        flight_present = True
        laser_rgb = LaserRGBFlight(flight)
        link.Write((*current_angles, *laser_rgb))
        last_angles = current_angles

      # flight no longer tracked; send one more command to turn off lasers
      elif flight_present:
        link.Write((*last_angles, *LASER_RGB_OFF))
        flight_present = False

      next_write = time.time() + WRITE_DELAY_TIME





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