can ros packages be directly used in ROS2?
can all packages developed in ROS be used directly in ROS2? or is there migration of code needed as per suitability of ROS2 needs?
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Adding to this: Many of the "little" things have changed with ROS2 (e.g. declaring parameters before their use, how the "spin" function should be handled, launch files are now python files, the DDS for message sending/receiving).
Check out the ROS2 Foxy tutorials. Run through them at least once and try making a quick and easy publisher+subscriber setup. They're very easy, and should give you a good gauge of how to work with ROS2!
