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Ok, got it working. Yes, I need a roscore running. I had some trouble because I incorrectly set the ROS_HOSTNAME. Once I got a roscore running, the rosbag play <bag> worked and I was able to run my code against the replayed topic.

Maybe it should've been obvious to me, but I would suggest noting in the docs that a roscore must be running for the bag to properly play. Since I'm using this to simulate output from a normally remote ros master, it was confusing to me.