This object indicates the reason of the last state
change of the WPAN service associated with this given
interface.
unknown (1) - unknown
powerDown (2) - power down WPAN module
powerUp (3) - power up WPAN module
moduleRemove (4) - module removed
moduleReload (5) - power cycle WPAN module
driverStop (6) - driver stop
driverStart (7) - driver start
firmwareUpgrade (8) - firmware upgrade
firmwareReset (9) - firmware reset
watchDog (10) - watchdog triggered