"/goal" in tum_simulator

edit

I have tried something like below to set a goal, and I think the published "/goal" is meant for navigating to the goal position defined (please correct me if I am wrong):

geometry_msgs::PointStamped goal_;

goal_.point.x = 10.0;
goal_.point.y = 10.0;
goal_.point.z = 10.0;

goal_pub_.publish(goal_);

But then, the problem is that the quadrocopter is not navigating at all. Did I overlook something.

Thanks in advance.