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Revision history [back]

For Python 3:

def serialize_msg(msg):
    buff = BytesIO()
    msg.serialize(buff)
    return buff.getvalue()

Traced it using ROS1 Melodic's implementation here:

https://github.com/ros/ros_comm/blob/fad51345f1937a8fca036b264a4c6fb034970a5f/clients/rospy/src/rospy/topics.py#L906

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