code: def start(self):
          
  
          # trick: we must send sensors and power supplies info after starting the router
          # otherwise they are not taken into account (Dynamips bug?)
          yield from Router.start(self)
          if self._sensors != [22, 22, 22, 22]:
              yield from self.set_sensors(self._sensors)
          if self._power_supplies != [1, 1]:
              yield from self.set_power_supplies(self._power_supplies)
docs: Starts this router.
          At least the IOS image must be set before starting it.