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Is it possible that "nh" is a private nodehandle? Have you tried fully specifying the topic name with "/the_published_topic"?

Is it possible that "nh" is a private nodehandle? Have you tried fully specifying the topic name with ~~"/the_published_topic"?~~"/the_published_topic"? Does "rosnode info" or "rostopic info" show that you are subscribed to the topic you think you are subscribed to?

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