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The problem is that all the nodes (some in python, some in C++) are launched from a single node writen in python (using the roslaun API)

while it can be convenient to do that, it also means you've disconnected yourself from whatever convenience roslaunch already provides.

so there is no easy way (as far as I know) to launch them each in a different terminal.

well, roslaunch is certainly capable of doing that. So if you want to go down this road, I'd recommend to see how it implements this.

If you have a simple solution to get this at least for the nodes I can easely modify, [..]

There is nothing to modify in nodes, your requirement is already covered by standard functionality.

I'm going to refer you to #q258929, of which your question is a duplicate.

If you did search before posting your question, could you please comment on which search terms you used, just so this Q&A will show up in the searches of future users?