A parametrized ROS node to send step input on cmd_vel topic

By default stepvel sends constant velocity of 2.0m/s with 0 steering angle on the /cmd_vel

rosrun stepvel stepvel_node

There are two parameters that stepvel node reads: constVel and strAngle. Parameters can be set as follows which will immediately change the input:

rosparam set /constVel 4.0

rosparam set /strAngle 0.04