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You can find out how many nodes are publishing and listening to a topic.

You'll need to create a subscriber to the topic, wait for a second or so for any publishers to connect then use the getNumPublishers() method to check that it's being published.

You can do the same trick with a subscriber and it's getNumSubscribers() method.

I don't know if there is a more direct approach, but I know this way will work.

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