Use JointTrajectoryAction and GraspHandPostureExecutionAction at the same time [closed]

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I want to use JointTrajectoryAction and GraspHandPostureExecutionAction at the same time. I want to control the gripper while the trajectory is moving. My first attempt was to write a "Callback based Simple Action Client" [1].

But, it turns out, that calling the SimpleActionClient::sendGoal() in one of the callback functions leads to a segmentation fault.

Any ideas how to solve this problem?

[1] Tutorials: Writing a Callback Based SimpleActionClient