using keyboard to control the robot in gazebo.

edit

You can run rosrun key_teleop key_teleop.py key_vel:=cmd_vel

I assum your robot alrd listened to cmd_vel topic to move. The key-teleop node is publising to key_vel topic by default so you need to remap to cmd_vel.

By the way, the value published by key-teleop is 0.8 when pressing up button, -0.5 when pressing down button, 1.0 rotation speed when pressing left/right button. So the motion might not be very smooth. You can take a look at another option which is turtle teleop ( http://wiki.ros.org/turtlebot_teleop ), some remapping is still needed though.