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




      txfer_obj, (truncated_string_b, ), format_string, max_length, start_pos=start_pos)


def StuffObject(
    txfer_obj, val, format_string, object_byte_size, start_pos=0):
  """Insert an object into pySerialtxfer TX buffer starting at the specified index.

  Args:
    txfer_obj: txfer - Transfer class instance to communicate over serial
    val: tuple of values to be inserted into TX buffer
    format_string: string used with struct.pack to pack the val
    object_byte_size: integer number of bytes of the object to pack
    start_pos: index of the last byte of the float in the TX buffer + 1

  Returns:
    start_pos for next object
  """
  val_bytes = struct.pack(format_string, *val)
  if len(val) > 1 and VERBOSE:
    print('SENT (%d byte struct): %s' % (object_byte_size, str(val)))


  for index in range(object_byte_size):
    txfer_obj.txBuff[index + start_pos] = val_bytes[index]



  return object_byte_size + start_pos


def OpenArduino(timeout=0, baud=115200, manufacturer='arduino', sn=None):
  """Finds a USB device with Arduino as its mfg and returns an open connection to it.

  Args:
    baud: The connection speed.
    timeout: Max duration in seconds that we should wait to establish a connection.

  Returns:
    Open link to the Arduino if found and opened; None otherwise.
  """
  initial_time = time.time()
  arduino_port = None
  attempted = False
  while not attempted or time.time() - initial_time < timeout and not arduino_port:
    attempted = True
    ports = serial.tools.list_ports.comports(include_links=False)
    for port in ports:




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




  location using its last-known position in the flight's lat / lon / speed / altitude /
  and track. Those attributes may have already been updated by messageboard using a
  more recently obtained radio signal from dump1090 than that in the canonical location,
  and if so, key flight_loc_now indicates the time at which those locations are current
  as of.

  Args:
    flight: dictionary of flight attributes.

  Returns:
    Returns a tuple of the azimuth and altitude, in degrees, at the current system time.
  """
  geo_time = flight.get('flight_loc_now')
  lat = flight.get('lat')
  lon = flight.get('lon')
  speed = flight.get('speed')
  altitude = flight.get('altitude')
  track = flight.get('track')
  unused_vertrate = flight.get('vertrate')
  if all([isinstance(x, numbers.Number) for x in (lat, lon, speed, altitude, track)]):

    meters_traveled = messageboard.MetersTraveled(speed, time.time() - geo_time)
    new_position = messageboard.TrajectoryLatLon((lat, lon), meters_traveled, track)


    angles = messageboard.Angles(
        messageboard.HOME,
        messageboard.HOME_ALT,
        new_position,
        altitude / messageboard.FEET_IN_METER)
    azimuth = angles['azimuth_degrees']
    altitude = angles['altitude_degrees']
    return (azimuth, altitude)

  return None

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




      txfer_obj, (truncated_string_b, ), format_string, max_length, start_pos=start_pos)


def StuffObject(
    txfer_obj, val, format_string, object_byte_size, start_pos=0):
  """Insert an object into pySerialtxfer TX buffer starting at the specified index.

  Args:
    txfer_obj: txfer - Transfer class instance to communicate over serial
    val: tuple of values to be inserted into TX buffer
    format_string: string used with struct.pack to pack the val
    object_byte_size: integer number of bytes of the object to pack
    start_pos: index of the last byte of the float in the TX buffer + 1

  Returns:
    start_pos for next object
  """
  val_bytes = struct.pack(format_string, *val)
  if len(val) > 1 and VERBOSE:
    print('SENT (%d byte struct): %s' % (object_byte_size, str(val)))
  if not SIMULATE_ARDUINO:
    try:
      for index in range(object_byte_size):
        txfer_obj.txBuff[index + start_pos] = val_bytes[index]
    except (OSError, serial.serialutil.SerialException) as e:
      LogMessage('Error %s in StuffObject with val %s and txfer_obj %s' % (e, str(val), str(txfer_obj)))
      return start_pos + index
  return object_byte_size + start_pos


def OpenArduino(timeout=0, baud=115200, manufacturer='arduino', sn=None):
  """Finds a USB device with Arduino as its mfg and returns an open connection to it.

  Args:
    baud: The connection speed.
    timeout: Max duration in seconds that we should wait to establish a connection.

  Returns:
    Open link to the Arduino if found and opened; None otherwise.
  """
  initial_time = time.time()
  arduino_port = None
  attempted = False
  while not attempted or time.time() - initial_time < timeout and not arduino_port:
    attempted = True
    ports = serial.tools.list_ports.comports(include_links=False)
    for port in ports:




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




  location using its last-known position in the flight's lat / lon / speed / altitude /
  and track. Those attributes may have already been updated by messageboard using a
  more recently obtained radio signal from dump1090 than that in the canonical location,
  and if so, key flight_loc_now indicates the time at which those locations are current
  as of.

  Args:
    flight: dictionary of flight attributes.

  Returns:
    Returns a tuple of the azimuth and altitude, in degrees, at the current system time.
  """
  geo_time = flight.get('flight_loc_now')
  lat = flight.get('lat')
  lon = flight.get('lon')
  speed = flight.get('speed')
  altitude = flight.get('altitude')
  track = flight.get('track')
  unused_vertrate = flight.get('vertrate')
  if all([isinstance(x, numbers.Number) for x in (lat, lon, speed, altitude, track)]):
    elapsed_time = time.time() - geo_time
    meters_traveled = messageboard.MetersTraveled(speed, elapsed_time)
    new_position = messageboard.TrajectoryLatLon((lat, lon), meters_traveled, track)
    distance = messageboard.HaversineDistanceMeters(new_position, messageboard.HOME)
    
    angles = messageboard.Angles(
        messageboard.HOME,
        messageboard.HOME_ALT,
        new_position,
        altitude / messageboard.FEET_IN_METER)
    azimuth = angles['azimuth_degrees']
    altitude = angles['altitude_degrees']
    return (azimuth, altitude)

  return None