Application Design

Defining Topic names in source code in each application is readable in example code, but is not ideal for a real system.

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When you write keyed data, the RTI Connext DDS has to send the unique identifier of each instance along with the data.

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You have two options for how to access data that a DataReader receives.

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You should never block in a listener callback.  There are many negative consequences of blocking in a listener callback:

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A DDS Publisher and Subscriber are responsible for sending and receiving the data. A Publisher contains one or multiple DataWriters.

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When using a WaitSet, you can be notified of new data arriving two ways:

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An application has multiple ways to be notified about data becoming available in a DataReader, depending on the application’s requirements - between these options, WaitSets are the safest.

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To send or receive samples from the DDS dataspace or domain, you must create a domain participant in that domain.

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Unlike when creating a socket and sending a UDP packet, creating DDS entities is more heavyweight.

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