interface Sensor {
  in void activate();
  in void deactivate();
  behaviour { 
    on activate: {}
    on deactivate: {}
  }
}
 
component SensorComp {
  provides Sensor sensor;
  behaviour {
    blocking {
      on sensor.activate(): blocking {
        sensor.reply(); 
      }
    }
    on sensor.deactivate(): {}
  }
}