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My guess on the issue is correct. It took trial and error to find the right joint value (0.7) so that

1) the gripper touches the objects, with the joint value error within move group tolerance, so that the status of grippercommand action is success

2) using gazebo_grasp_plugin, the gripper is able to securely grasp the object (object attached to gripper).

Here is a demo.

My guess on the issue is correct. It took trial and error to find the right joint value (0.7) so that

1) the gripper touches the objects, with the joint value error within move group tolerance, so that the status of grippercommand action is success

2) using gazebo_grasp_plugin, the gripper is able to securely grasp the object (object attached to gripper).

Here is a demo.