Remapping all topics of a machine to a namespace

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Hi guys,

I have to machines, one of them configured as the ROS_MASTER. Both of them are essentially running the same code, but I want both machines to publish messages to different topics, hence I thougt it would be good to put one of the machines into a different namespace.

I did that via export ROS_NAMESPACE=xyz

The code base is quite large, and sadly a lot of people used only global topic names during development, which causes ros to NOT prefix those topics ( /topic1 stays /topic1 while topic2 becomes /xyz/topic2).

Is there any other way (for example with the help of remapping) that would allow me to put all of the topics published by a single physical machine to a different namespace?

Thank you!