Show example using the API.

def main():
    """Show example using the API."""
    __async__ = True
    logging.basicConfig(format="%(levelname)-10s %(message)s",
                        level=logging.DEBUG)

    if len(sys.argv) != 2:
        logging.error("Must specify configuration file")
        sys.exit()
    config = configparser.ConfigParser()
    config.read(sys.argv[1])

    password = config.get('default', 'password')
    if __async__:
        client = Client(config.get('default', 'host'),
                        config.getint('default', 'port'), password, _callback)
    else:
        client = Client(config.get('default', 'host'),
                        config.getint('default', 'port'),
                        password)
        status = client.messages()
        msg = status[0]
        print(msg)
        print(client.mp3(msg['sha'].encode('utf-8')))
    while True:
        continue