interface Sensor {
  in void activate();
  in void deactivate();
  out void activated();
  out void deactivated();
  behaviour { 
    on activate: {}
    on deactivate: {}
  }
}

interface Start {
  in void start();
  behaviour {
    on start: {}
  }
}

component Test {
  provides Start start1;
  provides Start start2;
  requires Sensor sensor;
  behaviour {
    void fun() {
       reply();
     }

    blocking on start1.start(): { sensor.activate(); } 
    on start2.start(): { fun(); } 
    on sensor.activated(): { reply(); }
  }
}