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  identifier indicating the type of instruction, and the args is a possibly empty tuple
  with the attributes to follow thru.

  Possible commands are updating a GPIO pin, replaying a recent flight to the board,
  generating a histogram, or updating the saved settings.

  Args:
    q: multiprocessing queue provided to both the Arduino processes
    flights: list of flights
    configuration: dictionary of settings
    message_queue: current message queue
    next_message_time: epoch of the next message to display to screen

  Returns:
    A 2-tuple of the (possibly-updated) message_queue and next_message_time.
  """
  while not q.empty():
    command, args = q.get()

    if command == 'pin':
      Log(*args)  #todo
      UpdateStatusLight(*args)

    elif command == 'replay':
      # a command might request info about flight to be (re)displayed, irrespective of
      # whether the screen is on; if so, let's put that message at the front of the message
      # queue, and delete any subsequent messages in queue because presumably the button
      # was pushed either a) when the screen was off (so no messages in queue), or b)
      # because the screen was on, but the last flight details got lost after other screens
      # that we're no longer interested in
      messageboard_flight_index = IdentifyFlightDisplayed(
          flights, configuration, display_all_hours=True)
      if messageboard_flight_index is not None:
        message_queue = [m for m in message_queue if m[0] != FLAG_MSG_INTERESTING]
        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))




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  identifier indicating the type of instruction, and the args is a possibly empty tuple
  with the attributes to follow thru.

  Possible commands are updating a GPIO pin, replaying a recent flight to the board,
  generating a histogram, or updating the saved settings.

  Args:
    q: multiprocessing queue provided to both the Arduino processes
    flights: list of flights
    configuration: dictionary of settings
    message_queue: current message queue
    next_message_time: epoch of the next message to display to screen

  Returns:
    A 2-tuple of the (possibly-updated) message_queue and next_message_time.
  """
  while not q.empty():
    command, args = q.get()

    if command == 'pin':

      UpdateStatusLight(*args)

    elif command == 'replay':
      # a command might request info about flight to be (re)displayed, irrespective of
      # whether the screen is on; if so, let's put that message at the front of the message
      # queue, and delete any subsequent messages in queue because presumably the button
      # was pushed either a) when the screen was off (so no messages in queue), or b)
      # because the screen was on, but the last flight details got lost after other screens
      # that we're no longer interested in
      messageboard_flight_index = IdentifyFlightDisplayed(
          flights, configuration, display_all_hours=True)
      if messageboard_flight_index is not None:
        message_queue = [m for m in message_queue if m[0] != FLAG_MSG_INTERESTING]
        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))




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