MiXiM Simulator: Collecting total radio transmitting/idle times?

Question

I'm developing a MAC layer protocol and I need to collect physical layer total radio idle and transmitting times.

I've found that the INET framework provides this automatically, but I've been searching for the past 10 days for a similar solution under MiXiM without success.

Is there any method to do this built into Omnet++ or MiXiM? I assume this is a very common metric?

Thanks very much for any pointers.

Best wishes, Jose Fonseca