How to connect a topic to a node [closed]

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Hi, I think, I don't understand your problem completely. You want what topic remapped to what node? In your question, you were talking about to publishers.

Generally, when you want to remappt a topic, use something like this:

rosrun <package_name> <node_name> <old_topicname>:=<new_topicname>

As I understand your question, it should be something like this:

rosrun <package_name> /whycon <old_topicname>:=/main/image_raw

But maybe I didn't understand your question right.

Best regards.

Have you gone through the tutorials? These tutorials explain how to do just this. Without knowing what you've tried so far we don't know where you're at as far as your understanding of ROS goes (and we can also help you with your code to help you solve the problem).