How to cmd_vel a 90 degree turn?
i want to command the robot like this but to turn just 90 degrees, then stop
rostopic pub -r 10 /cmd_vel geometry_msgs/Twist '{linear: {x: 0.75, y: 0.0, z: 0.0}, angular:{x: 0.0, y: 0.0,z: 1.57}}'