Announcing protoros2: use protobuf in ros2 without compromise

an oss license has been added.

BTW, from ROS PMC Minutes for September 1st, 2026 - ROS / ROS PMC - Open Robotics Discourse

rosbag2#2476: playing bags with mixed serialization formats

Glad to see there are efforts of rosbags for protobuf. Are there any official release plan, like in next LTS version?