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Hi,

the topic is old, but since I struggled with the same issue, I figured to give my input here:

@End-effector: your approach seems good and as desribed in the different tutorials. Using group and namespace as you did will automatically add a :[namespace_name]/ at the beginning of the broadcasted topics.

Nevertheless, if your urdf description xacro file is including gazebo plugins which publish topics (/laser/scan or /imu for example); then you should not use

<robotNamespace></robotNamespace>

Indeed, it might be counter-intutive but adding those tags (and a value in-between) there seems to override the namespace from the launchfile.

For my part, removing those namespace soved the issue.