Hotspot radius update packets CoA and DR

Hey guys,

We run a number of mikrotik hotspot installations using our own hotspot system + radius etc etc.
What I’m trying to work out is:

Is it possible to send a radius packet to update a HOTSPOT active session and what is the best way to do this?

I’ve done a bit of investigation on CoA packets and was wondering if anyone else has had experience using these and were able to link me to the correct way to use CoA with the mikrotik hotspot (not pppoe).

http://tools.ietf.org/html/rfc3576 - Dynamic Authorization Extensions to RADIUS