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Well, that's theoretically correct but since a node is forced to connect to rosout and to clock topics:

topic: /rosout
- to: /rosout
- direction: outbound
- transport: TCPROS
- topic: /clock
- to: /gazebo (http://darpaws5:45435/)
- direction: inbound
- transport: TCPROS

Generally those topics run where roscore runs.

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