@Kosuke_MURAKAMI - Please see http://docs.ros.org/melodic/api/derived_object_msgs/html/msg/ObjectWithCovariance.html for a version which contains the PoseWithCovariance, TwistWithCovariance, and AccelWithCovariance. The uuid is definitely a useful addition that we had not considered and would be happy to add. This was the intent of the “id” field but it is somewhat limited as an int.
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