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Check your topics using rostopic list. By default your robot launches with the namespace poineer according to this line. I'm guessing your cmd_vel topic is actually called /poineer/cmd_vel in that case publishing to cmd_vel isn't going to do anything.
If you do not want to use a namspace, you need to launch roslaunch p3dx_gazebo p3dx_empty_world_no_ns.launch.
| | 2 | No.2 Revision |
Check your topics using rostopic list. By default your robot launches with the namespace poineerpioneercmd_vel topic is actually called /poineer/cmd_vel/pioneer/cmd_velcmd_vel isn't going to do anything.
If you do not want to use a namspace, namespace, you need to launch roslaunch p3dx_gazebo p3dx_empty_world_no_ns.launch.
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