def basic_messages(counter):
    """ Generate basic messages.

        Keyword arguments:
          content  - content to be displayed;
          sender   - program's name;
          duration - time for the message to be displayed.

        Return the message, the time the program must wait until sending next.
    """

    msg = {"content": "Simple Content n°" + str(counter),
           "sender": "SimpleTester",
           "duration": 20,
           "ttl": 60}

    return msg, 20