I've just started to learn Gazebo 7.
I have added a Pioneer 2DX robot and I want to control it. But I don't know how.
I have noticed that the robot has the plugin `libDiffDrivePlugin.so`. Checking the topics, with `gz topic -l`, I have found interesting this one:
/gazebo/default/pioneer2dx/vel_cmd
Maybe I can use it to move the robot but I don't know how to publish to it.
I have tried with `rqt`, using `Robot Steering`, but it seems that it publishes to `/cmd_vel`.
How can I move the robot using the keyboard?
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