@coroutine
def scan_online_devices(self, now=None):
    _LOGGER.info('Check online devices')
    for (mac, name) in self.devices.items():
        if (mac in self.wireless_devices):
            continue
        _LOGGER.info('Check %r', mac)
@coroutine
def scan_online_devices(self, now=None):
    _LOGGER.info('Check online devices')
    for (mac, name) in self.devices.items():
        if (mac in self.wireless_devices):
            continue
        _LOGGER.info('Check %r', mac)