* Don't schedule an update if the hass instance isn't instantiated
If we get a status update packet before self.hass exists, we trip a
"assert self.hass is not None" that was added in 0.112 and setup fails.
* Fix callback hander properly
The right fix is to register the callback after hass is ready for it.
* Remove unnecessary check
This is now guaranteed by the core code.
* Don't request an immediate device update and do an async connect.
* Remove unnecessary return
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