Namespaces are expanded for you automatically. You can see some examples here:

https://github.com/ros2/rcl/blob/release-beta2/rcl/test/rcl/test_expand_topic_name.cpp#L131-L158

In your particular case, you might need to know the target node's name and do something like this:

```
communicationNode.createClient("/" + nodeName + "/get_state");
```

But I'm not 100% sure without seeing what you're doing exactly.





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