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There are no masters or slaves in a ROS 1 system.
Communication is either publish-subscribe (ie: peer-to-peer), service-based (ie: client-server) or action-based (client-server).
The only "master" is the roscore, but that is not involved in communication between nodes and only serves as a DNS (ie: "which topic is published where?", etc). It does not participate in the exchange of bytes between nodes. ROS does not use a broker.
I thought the rostime of the slave is associated with that of the Master correct?
No, that's not correct.
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