Thanks to the team that audited CryptoCat for this idea. :-)

This may have been the cause of Bluetooth not always being disabled at
shutdown on the Sony Xperia Tipo.

This should enable us to connect to contacts faster at startup and
whenever a new means of connecting becomes available.

The LAN plugin only accepts IPv4 link-local or site-local addresses.
This rules out LANs that use globally routable addresses (such as UCL),
but also reduces the chances of the LAN plugin making observable
connections across the WAN, which could reveal the social graph.

Both plugins will attempt to reuse the previous address and port only if
there's currently an interface with that address; this will avoid
unnecessary attempts to bind to nonexistent addresses.

We can get all the information we need from the other status messages.