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6.6 Synergy of models ToC Previous Next

PubSub and Client Server are both based on the OPC UA Information Model. PubSub therefore can easily be integrated into Servers and Clients. Quite typically, a Publisher will be an Server (the owner of information) and a Subscriber is often a Client. Above all, the PubSub Information Model for configuration promotes the configuration of Publishers and Subscribers using the OPC UA Client Server model. Figure 8 depicts a single OPC UA Application that acts as both a Server and a Publisher.

readme_files/image010.png Figure 8 – Integrated Client Server and PubSub models

Nevertheless, the PubSub communication does not require such a role dependency. I.e., Clients can be Publishers and Servers can be Subscribers. In fact, there is no necessity for Publishers or Subscribers to be either a Server or a Client to participate in PubSub communications.

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