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Hi there,

Another solution for you is to use SimpleAction lib. So you write an action server that execute a callback that you can cancel from the client. Tell me if you need an example. You can find some doc here: http://wiki.ros.org/actionlib_tutorials/Tutorials/SimpleActionServer%28GoalCallbackMethod%29 http://wiki.ros.org/actionlib_tutorials/Tutorials/Writing%20a%20Callback%20Based%20Simple%20Action%20Client