def update_time(network_id)
      @serial.transmit(UpdateTimeRequest.new(:network_id => network_id))
      UpdateTimeAckResponse.read(@serial.receive(6))
      UpdateTimeResponse.read(@serial.receive(8))
    end
def update_time(network_id)
      @serial.transmit(UpdateTimeRequest.new(:network_id => network_id))
      UpdateTimeAckResponse.read(@serial.receive(6))
      UpdateTimeResponse.read(@serial.receive(8))
    end
Private: Updates the time of a device.

 This must be executed within an open session. I'm guessing it selects the
 network.

 network_id - 2 byte identified for the network.

 Returns nothing.