I started using [concert_msgs/Strings.msg](https://github.com/robotics-in-concert/rocon_msgs/blob/hydro-devel/concert_msgs/msg/Strings.msg) as a place for storing these hard-coded, but unique topic strings.

It's better than hard coding them in python/c++. But it'll still be a headache if they ever shift later and its a bad habit anyway.

I think a better solution for these simple scripts would be to write a topic discovery function given a msg type that we know is unique. An option might be to give it a namespace hint.