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2021-04-07 03:55:13 -0500 answered a question ROS 2 message_filters TimeSynchronizer minimal example does not reach callback function

Came here from your comment on a related question. You have the same issue as I mentioned in this answer to the same qu

2021-04-07 03:55:13 -0500 answered a question Using C++ message filters in ROS2

Even after changing the callback's arguments to const sensor_msgs::msg::Temperature::ConstSharedPtr&, your subscript