I think you misunderstood me. I already found this example.
What I'm looking for is a way to get all publishers/subscriptions that were created via rclcpp::Node->create_publisher (or create_subscription). I couldn't find an interface in the node for achieving this, but as far as I understand somewhere there must be a list which publishers and subscritptions were created.
Regarding answers.ros.org. What kind of questions should be asked here and what kind of questions on answers.ros.org? The latest I was aware of was that questions should be asked here instead of github.
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