* Add support for passive devices
* Fix a few issues
* Fix broken handling of closing a connection
This fixes the following error:
AttributeError: 'NoneType' object has no attribute 'write'
* Always use discovery broadcasts to trigger connects
From now on there's no connect loop but all attempts are initiated by
received discovery messages.
* Fix cancelling of heartbeat task
* Verify entry has been loaded before connecting
* Don't reset seqno when switching to type_d device
10e55e67b4