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Learn how to record, inspect, and replay ROS 2 topics with rosbag2 for reliable debugging and regression testing. Follow step‑by‑step commands, checks, and recovery options to ensure deterministic playback.
Symptom After recording a bag with rosbag2 using a message definition (e.g., geometry_msgs/msg/PoseStamped ), modifying that message type—such as adding a new field—and rebuilding the workspace causes playback to fail with a type hash mismatch. The bag stores serialized bytes and a type hash computed from the original definition; the new definition produces
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