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Can smach help me to get it done

I guess that is exactly what SMACH is. Or what SMACH_ROS is, since there you get SMACH states that wraps interaction to an action server or a service, so you can create arbitrary coordination of tasks: A must happen before B and if A fails then B is not executed, etc...

Can smach help me to get it done

I guess that is exactly what SMACH is. Or what SMACH_ROS is, since there you get SMACH states that wraps interaction to an action server or a service, so you can create arbitrary coordination of tasks: A tasks, e.g.:

'A' must happen before B 'B' and if A 'A' fails then B 'B' is not executed, etc...