use orb_advertise_multi:

- subscribe to actuator controls after topic has been advertised

src/drivers/hil/hil.cpp

@@ -348,9 +348,9 @@ HIL::task_main()
 	actuator_outputs_s outputs;
 	memset(&outputs, 0, sizeof(outputs));
 	/* advertise the mixed control outputs */
-	//int dummy;
-	_t_outputs = orb_advertise(ORB_ID(actuator_outputs),
-				   &outputs);
+	int dummy;
+	_t_outputs = orb_advertise_multi(ORB_ID(actuator_outputs),
+	&outputs, &dummy, ORB_PRIO_LOW);
 
 	px4_pollfd_struct_t fds[2];
 	fds[0].fd = _t_actuators;