How to use the regenmaschine.Client function in regenmaschine

from regenmaschine import Authenticator, Client
    from regenmaschine.exceptions import HTTPError
    from requests.exceptions import ConnectTimeout

    conf = config[DOMAIN]
    ip_address = conf[CONF_IP_ADDRESS]
    password = conf[CONF_PASSWORD]
    port = conf[CONF_PORT]
    ssl = conf[CONF_SSL]

    _LOGGER.debug('Setting up RainMachine client')

    try:
        auth = Authenticator.create_local(
            ip_address, password, port=port, https=ssl)
        client = Client(auth)
        hass.data[DATA_RAINMACHINE] = RainMachine(client)
    except (HTTPError, ConnectTimeout, UnboundLocalError) as exc_info:
        _LOGGER.error('An error occurred: %s', str(exc_info))
        hass.components.persistent_notification.create(
            'Error: {0}<br>'
            'You will need to restart hass after fixing.'
            ''.format(exc_info),
            title=NOTIFICATION_TITLE,
            notification_id=NOTIFICATION_ID)
        return False

    _LOGGER.debug('Setting up switch platform')
    switch_config = conf.get(CONF_SWITCHES, {})
    discovery.load_platform(hass, 'switch', DOMAIN, switch_config, config)

    _LOGGER.debug('Setup complete')

async def async_setup_entry(hass, config_entry):
    """Set up RainMachine as config entry."""
    _verify_domain_control = verify_domain_control(hass, DOMAIN)

    websession = aiohttp_client.async_get_clientsession(hass)
    client = Client(websession)

    try:
        await client.load_local(
            config_entry.data[CONF_IP_ADDRESS],
            config_entry.data[CONF_PASSWORD],
            port=config_entry.data[CONF_PORT],
            ssl=config_entry.data[CONF_SSL],
        )
    except RainMachineError as err:
        _LOGGER.error("An error occurred: %s", err)
        raise ConfigEntryNotReady
    else:
        # regenmaschine can load multiple controllers at once, but we only grab the one
        # we loaded above:
        controller = next(iter(client.controllers.values()))