The Request-Reply communication pattern is only available with the Connext DDS Professional, Evaluation, and Basic package types.
As real-time and embedded applications become more complex, and require integration with enterprise applications, you may need additional communication patterns besides publish-subscribe. Perhaps your application needs certain information only occasionally—such as changes in temperature over the past hour, or even just once, such as application configuration data that is required only at start up. To get information only when needed, Connext DDS supports a request-reply communication pattern, which is described in the following sections:
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