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  Simulations should use a timestamp contemporaneous with the flights, whereas live
  data should use the current timestamp.
  """
  if not additional_attr:
    return 0
  if additional_attr['simulation']:
    return json_desc_dict['now']
  return time.time()


def GenerateRemoteMessage(
    flight, json_desc_dict, configuration, additional_attr, display_mode):
  """Generates a value-tuple to be packed and sent to the arduino remote.

  Args:
    flight: dictionary describing the most recent flight.
    json_desc_dict: dictionary representing the current radio signal.
    configuration: dictionary representing the current state of the messageboard
      configuration.
    additional_attr: dictionary with miscellaneous attributes from messageboard.
    display_mode: integer specifying what display mode, so that the text display lines
      can be appropriately configured.

  Returns:
    Dictionary of values, where the dict keys and types are specified by
    RemoteMain.write_config.
  """
  flight_last_seen = flight.get('now')  # time flight was seen

  line1_decimal_mask = '00000000'
  line2_decimal_mask = '00000000'
  if display_mode == DISP_LAST_FLIGHT_NUMB_ORIG_DEST:
    # UAL1827 / SFO-LAX
    line1 = ''
    line2 = ''
    if flight:
      line1 = messageboard.DisplayFlightNumber(flight)
      origin = messageboard.DisplayOriginIata(flight)[:3]
      destination = messageboard.DisplayDestinationIata(flight)[:3]
      line2 = '%s-%s' % (origin, destination)





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    radio_range_flights = json_desc_dict.get('radio_range_flights', 0)
    plural = ''
    if radio_range_flights != 1:
      plural = 'S'
    line2 = '%d PLANE%s' % (radio_range_flights, plural)

  d = {}
  setting_screen_enabled = False
  if 'setting_screen_enabled' in configuration:
    setting_screen_enabled = True
  d['setting_screen_enabled'] = setting_screen_enabled
  d['setting_max_distance'] = configuration['setting_max_distance']
  d['setting_max_altitude'] = configuration['setting_max_altitude']
  d['setting_on_time'] = configuration['setting_on_time']
  d['setting_off_time'] = configuration['setting_off_time']
  d['setting_delay'] = configuration['setting_delay']
  d['line1'] = line1.upper()
  d['line2'] = line2.upper()
  d['line1_dec_mask'] = int(line1_decimal_mask, 2)
  d['line2_dec_mask'] = int(line2_decimal_mask, 2)


  return d


def ExecuteArduinoCommand(
    command, configuration, display_mode, low_battery, to_parent_q, link):
  """Executes the request as communicated in the command string.

  The remote may make one of the following requests:
  - Update a setting
  - (Re)display a recent flight
  - Display a histogram
  - Send information for a different display mode
  - Indicate that the battery is low

  Args:
    command: dictionary representing all data fields from remote.
    configuration: dictionary representing the current state of the messageboard
      configuration.
    display_mode: current display mode; only passed so that we may identify changes.




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  Simulations should use a timestamp contemporaneous with the flights, whereas live
  data should use the current timestamp.
  """
  if not additional_attr:
    return 0
  if additional_attr['simulation']:
    return json_desc_dict['now']
  return time.time()


def GenerateRemoteMessage(
    flight, json_desc_dict, configuration, additional_attr, display_mode):
  """Generates a value-tuple to be packed and sent to the arduino remote.

  Args:
    flight: dictionary describing the most recent flight.
    json_desc_dict: dictionary representing the current radio signal.
    configuration: dictionary representing the current state of the messageboard
      configuration.
    additional_attr: dictionary with miscellaneous attributes from messageboard.
    display_mode: integer specifying the display mode, so that the text display lines
      can be appropriately configured.

  Returns:
    Dictionary of values, where the dict keys and types are specified by
    RemoteMain.write_config.
  """
  flight_last_seen = flight.get('now')  # time flight was seen

  line1_decimal_mask = '00000000'
  line2_decimal_mask = '00000000'
  if display_mode == DISP_LAST_FLIGHT_NUMB_ORIG_DEST:
    # UAL1827 / SFO-LAX
    line1 = ''
    line2 = ''
    if flight:
      line1 = messageboard.DisplayFlightNumber(flight)
      origin = messageboard.DisplayOriginIata(flight)[:3]
      destination = messageboard.DisplayDestinationIata(flight)[:3]
      line2 = '%s-%s' % (origin, destination)





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    radio_range_flights = json_desc_dict.get('radio_range_flights', 0)
    plural = ''
    if radio_range_flights != 1:
      plural = 'S'
    line2 = '%d PLANE%s' % (radio_range_flights, plural)

  d = {}
  setting_screen_enabled = False
  if 'setting_screen_enabled' in configuration:
    setting_screen_enabled = True
  d['setting_screen_enabled'] = setting_screen_enabled
  d['setting_max_distance'] = configuration['setting_max_distance']
  d['setting_max_altitude'] = configuration['setting_max_altitude']
  d['setting_on_time'] = configuration['setting_on_time']
  d['setting_off_time'] = configuration['setting_off_time']
  d['setting_delay'] = configuration['setting_delay']
  d['line1'] = line1.upper()
  d['line2'] = line2.upper()
  d['line1_dec_mask'] = int(line1_decimal_mask, 2)
  d['line2_dec_mask'] = int(line2_decimal_mask, 2)
  d['display_mode'] = display_mode

  return d


def ExecuteArduinoCommand(
    command, configuration, display_mode, low_battery, to_parent_q, link):
  """Executes the request as communicated in the command string.

  The remote may make one of the following requests:
  - Update a setting
  - (Re)display a recent flight
  - Display a histogram
  - Send information for a different display mode
  - Indicate that the battery is low

  Args:
    command: dictionary representing all data fields from remote.
    configuration: dictionary representing the current state of the messageboard
      configuration.
    display_mode: current display mode; only passed so that we may identify changes.




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