I've pushed the code to run Babel over unicast. It's in branch "unicast".
In order to use it, you need to say in your config file:
default unicast true
It's a per-interface parameter.
The code is pretty nasty, and not up-to-date with master, so I'll probably
be rebasing it some more. Since Antonin is basing his DTLS code on this,
we'd be grateful for proof-reading and testing.
Note that I didn't need unicast Hellos. I'm still not sure they should stay.
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