Maybe you can elaborate what exactly you are trying to achieve. The current format supports basically all primitive types. Your use case seem to be already addressed by defining a field with the type `byte[]`. Maybe for that type it only needs to be reconsidered how it is mapped into specific languages like Python. I agree with you that `bytes` sounds like the more "natural" type in Python. --- [Visit Topic](https://discourse.ros.org/t/discussion-about-how-to-add-a-new-primitive-types-to-rosidl-msg/4607/2) or reply to this email to respond. If you do not want to receive messages from ros-users please use the unsubscribe link below. If you use the one above, you will stop all of ros-users from receiving updates. ______________________________________________________________________________ ros-users mailing list ros-users@lists.ros.org http://lists.ros.org/mailman/listinfo/ros-users Unsubscribe: