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Show HN: Cerulion – ROS 2-compatible robotics runtime with multi-process replay

Source: Show HN · Added Thursday, November 12, 2026

Hi HN, I'm Lakshay. Raveen and I built Cerulion, an open-source Rust robotics runtime that deterministically replays recorded multi-process runs against new code and runs existing ROS 2 nodes unmodified. Repo: https://github.com/cerulion-inc/cerulion During my MIT PhD in off-road autonomy, a robot with two lidars and six cameras had too much latency between ROS processes. ROS 2's loaned messages need POD data, which rules out the standard sensor types like Image and PointCloud2. We ended up using a single process, which is very brittle. And when it broke, I couldn't reproduce the heisenbug rel

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Show HN: Cerulion – ROS 2-compatible robotics runtime with multi-process replay is a tool discovery curated from Show HN. Hi HN, I'm Lakshay. Raveen and I built Cerulion, an open-source Rust robotics runtime that deterministically replays recorded multi-process runs against new code and runs…

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