Message flows
Figure 9 shows the basic flow of messages using the Register Publisher, Deregister Publisher, Register Subscriber, Deregister Subscriber and Publish command message and responses. This flow applies to all event publications, and to state information where the subscriber wants to get the latest published state of a topic.
The responses are optional, and the Register Publisher and Deregister Publisher command messages can be omitted (publishers can choose not to register, or to register on their first publish command). So the flow diagram can be simplified as shown in Figure 10.
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