The Read command returns the last DHT reset cause as follows: 0: Unknown reset cause (= error while reading). 1: Power On reset 2: Hard reset 3: Soft reset 4: Atmel Watchdog reset 5: Shutdown reset Writing a value to this MIB causes the DHT to execute a reset of the requested type (Only Hard, Soft and ShutDown are allowed). The shutdown reset uses the parameters wakeUpVoltage and wakeUpPortId which must be set before setting this MIB to 5.