If anyone runs into this I've answered this question at:
https://answers.ros.org/question/300874/how-do-you-use-callbackgroups-as-a-replacement-for-callbackqueues-in-ros2/?answer=301165#post-id-301165
---
[Visit Topic](
https://discourse.ros.org/t/ros2-package-migration-replacement-for-callbackqueueinterface/5751/2) or reply to this email to respond.
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