Hi, It seems that, like the CCA timer, the backoff timer (backoffT in CsmaCA802_15_4) is also being rescheduled while it is already running. This may potentially cause CalendarScheduler to go into an infinite loop.
I am solving the problem as follows: before starting a Mac802_15_4Timer, I am explicitly checking if the event associated with Mac802_15_4Timer has a positive uid_ (ie is already scheduled to fire some time in future). In that case, I explictly remove the event from the scheduler before giving it again to the scheduler. Thanks Mukul
