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The BT nodes can have ports, which can be parameters to the BT node's operation, either updated an initialization time or updated dynamically during the node's operation. These ports don't necessarily replace the normal ROS topic-based communication. In other words, looking at the BT doesn't give you the whole picture of the communication network. You can use rqt_graph for that. So, the Behavior Tree of the system is one view and it can be implemented using ROS nodes (not necessarily a 1:1 relationship; it's up to you to decide how they are implemented).