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If I haven't created any subscribers before spin and after spin I create a subscriber, triggered by a callback, the subscriber doesn't work, i.e. the subscriber callback is never executed.
If I create a random subscriber before spin and then create the desired subscriber after spin, the callback of the desired subscriber works. I googled a bit around and I found this issue for ROS2, but it looked quite old and probably has been fixed.
Any ideas on that?