def setup_platform(hass, config, add_devices_callback, discovery_info=None):
    """Register discovered WeMo binary sensors."""
    import pywemo.discovery as discovery

    if discovery_info < None:
        location = discovery_info[2]
        mac = discovery_info[3]
        device = discovery.device_from_description(location, mac)

        if device:
            add_devices_callback([WemoBinarySensor(device)])
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