async def cli_handler(loop):
    """Application starts here."""
    parser = argparse.ArgumentParser()

    parser.add_argument('command', nargs='+',
                        help='commands, help, ...')
    parser.add_argument('--name', help='apple tv name',
                        dest='name', default='Apple TV')
    parser.add_argument('--address', help='device ip address or hostname',
                        dest='address', default=None)
    parser.add_argument('--protocol', action=TransformProtocol,
                        help='protocol to use (values: dmap, mrp)',
                        dest='protocol', default=None)
    parser.add_argument('--port', help='port when connecting',
                        dest='port', type=_in_range(0, 65535),
                        default=0)
    parser.add_argument('-t', '--scan-timeout', help='timeout when scanning',
                        dest='scan_timeout', type=_in_range(1, 100),
                        metavar='TIMEOUT', default=3)
    parser.add_argument('--version', action='version',
                        help='version of atvremote and pyatv',
                        version='%(prog)s {0}'.format(const.__version__))

    pairing = parser.add_argument_group('pairing')
    pairing.add_argument('--remote-name', help='remote pairing name',
                         dest='remote_name', default='pyatv')
    pairing.add_argument('-p', '--pin', help='pairing pin code',
                         dest='pin_code', metavar='PIN', default=1234,
                         type=_in_range(0, 9999, allow_none=True))
    pairing.add_argument('--pairing-guid',
                         help='pairing guid (16 chars hex)',
                         dest='pairing_guid', default=None)

    parser.add_argument('-a', '--autodiscover', action='store_true',
                        help='automatically find a device',
                        dest='autodiscover', default=False)
    parser.add_argument('--device_credentials', help='credentials to device',
                        dest='device_credentials', default=None)

    airplay = parser.add_argument_group('airplay')
    airplay.add_argument('--airplay_credentials',
                         help='credentials for airplay',
                         dest='airplay_credentials', default=None)

    debug = parser.add_argument_group('debugging')
    debug.add_argument('-v', '--verbose', help='increase output verbosity',
                       action='store_true', dest='verbose')
    debug.add_argument('--debug', help='print debug information',
                       action='store_true', dest='debug')

    args = parser.parse_args()
    loglevel = logging.WARNING
    if args.verbose:
        loglevel = logging.INFO
    if args.debug:
        loglevel = logging.DEBUG

    logging.basicConfig(level=loglevel,
                        format='%(levelname)s: %(message)s')
    logging.getLogger('requests').setLevel(logging.WARNING)

    cmds = retrieve_commands(GlobalCommands)

    if args.command[0] in cmds:
        glob_cmds = GlobalCommands(args, loop)
        return (await _exec_command(
            glob_cmds, args.command[0], print_result=False))
    if args.autodiscover:
        if not await _autodiscover_device(args, loop):
            return 1

        return await _handle_commands(args, loop)
    if args.address:
        return await _handle_commands(args, loop)

    logging.error('To autodiscover an Apple TV, add -a')

    return 1
Application starts here.