We've discussed it before, but it's largely seen as overlapping in functionality with topic namespaces.
If you have a use case that is made possible with keys, then that would be interesting to hear about it.
However, there are quite a few little details for implementing the key field which are not straightforward to me, like:
- each vendor has its own way of defining them
- dealing with key fields in nested messages
- use of them has to be made visible from all of the ROS tools
Probably other things I cannot even think of now. So unless there is a big use case which is not possible with namespaced topics, I think we'd probably not expose it.
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