$ rostopic pub /gripper/command std_msgs/String 'close'
$ rostopic pub /gripper/command std_msgs/String 'open'
$ rostopic pub /gripper/command std_msgs/String 'softGrip'
$ rostopic pub /gripper/command std_msgs/String 'strongGrip'
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$ rostopic pub /gripper/command std_msgs/String 'close'
$ rostopic pub /gripper/command std_msgs/String 'open'
$ rostopic pub /gripper/command std_msgs/String 'softGrip'
$ rostopic pub /gripper/command std_msgs/String 'strongGrip'