When a device sends WIRELESS_DEVICE_STATUS with config_needed=1, the host
should re-push settings and acknowledge via ConfigChange SetComplete. The
existing code relied on the push flag in changed(), but operator precedence
caused push=True to be ignored for devices that have the WIRELESS_DEVICE_STATUS
feature — the exact devices that send this notification.
Handle the reconfiguration entirely in the notification handler: explicitly
push settings and ack, rather than trying to overload the changed() condition.
Also replace hardcoded cookie 0x11 with proper GetCookie/SetComplete protocol:
read the device's current configuration cookie and echo it back, per the
ConfigChange (0x0020) specification.
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