Hi Hermans,
Thanks. 
p2os works and also topic /gripper_control subscribes msg GripperState.
Now as msg GripperState is:
GripState grip
LiftState lift

with
GripState being
uint32 state
int32 dir
bool inner_beam
bool outer_beam
bool left_contact
bool right_contact

and LiftState being
int32 state
int32 dir
float32 position

But when I apply any of following commands:
rostopic pub /gripper_control p2os_driver/GripperState 0 0 0 0 0 0 0 0 0
rostopic pub /gripper_control p2os_driver/GripperState [0 0 0 0 0 0 0 0 0]
rostopic pub /gripper_control p2os_driver/GripperState [0 0 0 0 0 0][ 0 0 0]
rostopic pub /gripper_control p2os_driver/GripperState [0 0 0 0 0 0],[ 0 0
0]
rostopic pub /gripper_control p2os_driver/GripperState [[0 0 0 0 0 0 ],[0 0
0]]
rostopic pub /gripper_control p2os_driver/GripperState [0, 0, 0, 0, 0, 0, 0,
0, 0]
rostopic pub /gripper_control p2os_driver/GripperState [0, 0, 0, 0, 0, 0],[
0, 0, 0]
rostopic pub /gripper_control p2os_driver/GripperState [[0, 0, 0, 0, 0, 0],[
0, 0, 0]]
rostopic pub /gripper_control p2os_driver/GripperState [[0, 0, "false",
"false", "false", "false" ],[0, 0, 0]]

I dont know how exactly should I provide the arguments?

regards,



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