'Initialize the cover.'

def __init__(self, hass, config):

    KNXMultiAddressDevice.__init__(self, hass, config, [], optional=['state', 'brightness', 'brightness_state'])
    self._hass = hass
    self._supported_features = 0
    if (CONF_BRIGHTNESS_ADDRESS in config.config):
        _LOGGER.debug('%s    is    dimmable', self.name)
        self._supported_features = (self._supported_features | SUPPORT_BRIGHTNESS)
        self._brightness = None
