Hi Jamal,

quoted

But Bluetooth devices are not network devices, it seems. There exists no
current mechanism for notifying anyone of state changes. Should we invent a
new method of notification using netlink, or should Bluetooth interfaces in
fact be normal network devices just like IrDA devices are?

I think the only time you should go netdev is when it makes sense to run IP. 

Totally agree.

Is there IP over bluttooth? 

Yep. It's called BNEP (Bluetooth Network Encapsulation Protocol) which is bascially
an Ethernet emulation. That thing is the netdev of course.

Then you could take advantage of all the nice features provided by netdevices (other 
than being IP devices;->).
If not, it probably time for someone to write a generic notification
scheme via netlink.

Might be interesting.

Max