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Is it correct to set topic names from parameters?

This topic was recently raised in a project I frequent, and although I thought the answer was relatively simple, asking it at ROS Answers has turned up aspects I hadn’t considered. In the interest of broadening the range of opinions, I thought I would raise it here, too.

Please discuss over at ROS Answers rather than here, unless Tully is happy with this turning into worse cross-posting than it already is. :stuck_out_tongue: