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          block=False)

      if 'test_servos' in configuration:
        messageboard.RemoveSetting(configuration, 'test_servos')
        link.Write((0, 0, *LASER_RGB_OFF))
        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))

      timing.append((time.time(), 3))
      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
      timing.append((time.time(), 4))

    if time.time() >= next_read:
      link.Read()  # simple ack message sent by servos
      next_read = time.time() + READ_DELAY_TIME
      timing.append((time.time(), 5))

    now = GetNow(json_desc_dict, additional_attr)
    timing.append((time.time(), 6))

    current_angles = AzimuthAltitude(flight, now)
    timing.append((time.time(), 7))
    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)))
        messageboard.LogTimes(timing)
        flight_present = True
        laser_rgb = LaserRGBFlight(flight)
        timing = [(time.time(), 0)]
        link.Write((*current_angles, *laser_rgb))
        last_angles = current_angles
        timing.append((time.time(), 1))

      # flight no longer tracked; send one more command to turn off lasers
      elif flight_present:
        timing = [(time.time(), -1)]
        link.Write((*last_angles, *LASER_RGB_OFF))
        flight_present = False

      next_write = time.time() + WRITE_DELAY_TIME
    else:
      timing = timing = [(time.time(), -2)]

  link.Close(SHUTDOWN_TEXT)


LASER_RGB_OFF = (0, 0, 0)
def LaserRGBFlight(flight):
  """Based on flight attributes, set the laser."""
  if not flight:
    return LASER_RGB_OFF
  return 1, 0, 0


def DifferentFlights(f1, f2):
  """True if flights same except for persistent path; False if they differ.

  We cannot simply check if two flights are identical by checking equality of the dicts,
  because a few attributes are updated after the flight is first found:
  - the persistent_path is kept current
  - cached_* attributes may be updated
  - the insights are generated after flight first enqueued




                            <----SKIPPED LINES---->

                            <----SKIPPED LINES---->




          block=False)

      if 'test_servos' in configuration:
        messageboard.RemoveSetting(configuration, 'test_servos')
        link.Write((0, 0, *LASER_RGB_OFF))
        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))

      timing.append((time.time(), 3))
      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)

        timing.append((time.time(), 4))
        # 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
      timing.append((time.time(), 5))

    if time.time() >= next_read:
      link.Read()  # simple ack message sent by servos
      next_read = time.time() + READ_DELAY_TIME
      timing.append((time.time(), 6))

    now = GetNow(json_desc_dict, additional_attr)
    timing.append((time.time(), 7))

    current_angles = AzimuthAltitude(flight, now)
    timing.append((time.time(), 8))
    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)))
        messageboard.LogTimes(timing, threshold=0.2)
        flight_present = True
        laser_rgb = LaserRGBFlight(flight)
        timing = [(time.time(), 0)]
        link.Write((*current_angles, *laser_rgb))
        last_angles = current_angles
        timing.append((time.time(), 1.1))

      # flight no longer tracked; send one more command to turn off lasers
      elif flight_present:
        timing = [(time.time(), 1.2)]
        link.Write((*last_angles, *LASER_RGB_OFF))
        flight_present = False

      next_write = time.time() + WRITE_DELAY_TIME
    else:
      timing = timing = [(time.time(), 1.3)]

  link.Close(SHUTDOWN_TEXT)


LASER_RGB_OFF = (0, 0, 0)
def LaserRGBFlight(flight):
  """Based on flight attributes, set the laser."""
  if not flight:
    return LASER_RGB_OFF
  return 1, 0, 0


def DifferentFlights(f1, f2):
  """True if flights same except for persistent path; False if they differ.

  We cannot simply check if two flights are identical by checking equality of the dicts,
  because a few attributes are updated after the flight is first found:
  - the persistent_path is kept current
  - cached_* attributes may be updated
  - the insights are generated after flight first enqueued




                            <----SKIPPED LINES---->