Gripper (UORB message) 
Used to command an actuation in the gripper, which is mapped to a specific output in the control allocation module 
c
## Used to command an actuation in the gripper, which is mapped to a specific output in the control allocation module
uint64 timestamp
int8 command        # Commanded state for the gripper
int8 COMMAND_GRAB = 0
int8 COMMAND_RELEASE = 1