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      if messageboard_flight_index is not None:
        message_queue = [m for m in message_queue if m[0] != FLAG_MSG_INSIGHT]
        flight_message = CreateMessageAboutFlight(flights[messageboard_flight_index])
        message_queue = [(FLAG_MSG_FLIGHT, flight_message)]
        next_message_time = time.time()

    elif command == 'histogram':
      if not flights:
        Log('Histogram requested by remote %s but no flights in memory' % str(args))
      else:
        histogram_type, histogram_history = args
        message_queue.extend(MessageboardHistograms(
            flights,
            histogram_type,
            histogram_history,
            '_1',
            False))

    elif command == 'update_configuration':
      updated_settings = args[0]
      Log('Updated settings received from arduino: %s' % str(updated_settings))
      configuration.update(updated_settings)
      if 'setting_screen_enabled' not in updated_settings:
        configuration.pop('setting_screen_enabled')
      WriteFile(CONFIG_FILE, configuration)

    else:
      Log('Improper command from arduinos: %s / %s' % (command, args))

  return message_queue, next_message_time


def PublishMessage(
    s,
    subscription_id='12fd73cd-75ef-4cae-bbbf-29b2678692c1',
    key='c5f62d44-e30d-4c43-a43e-d4f65f4eb399',
    secret='b00aeb24-72f3-467c-aad2-82ba5e5266ca',
    timeout=3):
  """Publishes a text string to a Vestaboard.

  The message is pushed to the vestaboard splitflap display by way of its web services;
  see https://docs.vestaboard.com/introduction for more details.

  Args:
    s: String to publish.




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




  flight message during user-specified hours of the day. This clears the board, if
  requested, and then adds that message to the queue.

  Args:
    configuration: the settings dictionary.
    message_queue: the existing queue, to which the personal message - if any - is added.
  """
  if 'clear_board' in configuration:
    RemoveSetting(configuration, 'clear_board')
    message_queue.append((FLAG_MSG_CLEAR, ''))
  minute_of_day = MinuteOfDay()
  if (
      not message_queue and
      'personal_message_enabled' in configuration and
      configuration['personal_message'] and
      minute_of_day <= configuration['personal_off_time'] and
      minute_of_day > configuration['personal_on_time'] + 1):
    message = configuration['personal_message']
    lines = [TruncateEscapedLine(l) for l in message.split('\n')[:SPLITFLAP_LINE_COUNT]]
    message_queue.append((FLAG_MSG_PERSONAL, lines))



def ManageMessageQueue(message_queue, next_message_time, configuration):
  """Check time & if appropriate, display next message from queue.

  Args:
    message_queue: FIFO list of message tuples of (message type, message string).
    next_message_time: epoch at which next message should be displayed
    configuration: dictionary of configuration attributes.

  Returns:
    Next_message_time, potentially updated if a message has been displayed, or unchanged
    if no message was displayed.
  """
  if message_queue and (time.time() >= next_message_time or SIMULATION):

    if SIMULATION:  # drain the queue because the messages come so fast
      messages_to_display = list(message_queue)
      # passed by reference, so clear it out since we drained it to the display
      del message_queue[:]




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      if messageboard_flight_index is not None:
        message_queue = [m for m in message_queue if m[0] != FLAG_MSG_INSIGHT]
        flight_message = CreateMessageAboutFlight(flights[messageboard_flight_index])
        message_queue = [(FLAG_MSG_FLIGHT, flight_message)]
        next_message_time = time.time()

    elif command == 'histogram':
      if not flights:
        Log('Histogram requested by remote %s but no flights in memory' % str(args))
      else:
        histogram_type, histogram_history = args
        message_queue.extend(MessageboardHistograms(
            flights,
            histogram_type,
            histogram_history,
            '_1',
            False))

    elif command == 'update_configuration':
      updated_settings = args[0]
      Log('Updated settings received from arduino: %s' % updated_settings)



      WriteFile(CONFIG_FILE, updated_settings)

    else:
      Log('Improper command from arduinos: %s / %s' % (command, args))

  return message_queue, next_message_time


def PublishMessage(
    s,
    subscription_id='12fd73cd-75ef-4cae-bbbf-29b2678692c1',
    key='c5f62d44-e30d-4c43-a43e-d4f65f4eb399',
    secret='b00aeb24-72f3-467c-aad2-82ba5e5266ca',
    timeout=3):
  """Publishes a text string to a Vestaboard.

  The message is pushed to the vestaboard splitflap display by way of its web services;
  see https://docs.vestaboard.com/introduction for more details.

  Args:
    s: String to publish.




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




  flight message during user-specified hours of the day. This clears the board, if
  requested, and then adds that message to the queue.

  Args:
    configuration: the settings dictionary.
    message_queue: the existing queue, to which the personal message - if any - is added.
  """
  if 'clear_board' in configuration:
    RemoveSetting(configuration, 'clear_board')
    message_queue.append((FLAG_MSG_CLEAR, ''))
  minute_of_day = MinuteOfDay()
  if (
      not message_queue and
      'personal_message_enabled' in configuration and
      configuration['personal_message'] and
      minute_of_day <= configuration['personal_off_time'] and
      minute_of_day > configuration['personal_on_time'] + 1):
    message = configuration['personal_message']
    lines = [TruncateEscapedLine(l) for l in message.split('\n')[:SPLITFLAP_LINE_COUNT]]
    message_queue.append((FLAG_MSG_PERSONAL, lines))
    Log('Personal message added to queue: %s' % str(lines))


def ManageMessageQueue(message_queue, next_message_time, configuration):
  """Check time & if appropriate, display next message from queue.

  Args:
    message_queue: FIFO list of message tuples of (message type, message string).
    next_message_time: epoch at which next message should be displayed
    configuration: dictionary of configuration attributes.

  Returns:
    Next_message_time, potentially updated if a message has been displayed, or unchanged
    if no message was displayed.
  """
  if message_queue and (time.time() >= next_message_time or SIMULATION):

    if SIMULATION:  # drain the queue because the messages come so fast
      messages_to_display = list(message_queue)
      # passed by reference, so clear it out since we drained it to the display
      del message_queue[:]




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