Direct Message other people on ROS Answers?

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Please just use the @ notation to notify the other user. It is not helpful for the rest of the community if you solve the problems offline. If you need to have a series of comments to make progress it's not considered spam. If you want completely interactive support you can meet them on IRC or any other communication channel you would like if they're willing to do that. It is usually useful to keep your conversation on the question though so that others who might have knowledge in the area can jump in after you have added more debugging information.

So as long as you're on topic and focused on answering the specific question don't feel bad about having a long comment stream. Once you solve the problem it would be helpful to write up an answer as a summary.