Maybe you can elaborate what exactly you are trying to achieve
when I use cv_bridge in ros2 , the img_msg is turned into list in python , but the cv_bridge needs a byte type when transform the img_msg.data into cv2 img type .
(the img_msg.data is uint8 [] and is turned into list after transform)
So we rewrite the genorator_py in rosidl to make the uint8 turn into byte type , and it works well
but to avoid effecting other algorithm which using uint8 as well in pyhton , we want to create a new_uint8[] for a new msg type like new_imagemsg so that we don’t need to transform all uint8[] to bytes , but only in some special situations (like using cv_bridge) , we can use the new message type and get the byte type instead of list . and other algorithm can still receive the image_msg.data as list type
So i just want to know whether this idea can work , and how to make it .
I’m trying to rewrite the python-end in rosidl and build a new primitive type （maybe use dtype() ?） and a new msg_type and try to analyze the type