Does CycloneDDS automatically group subscribers into multicast groups based on topic?

[xiaoyuyaa555]

Hi,

I would like to understand how CycloneDDS handles multicast grouping for subscribers. Specifically, does CycloneDDS automatically group subscribers into different multicast groups based on the topic they are subscribing to? Or is this process something that needs to be manually configured?

Thank you!

[eboasson]

I would love for it to do that automatically, but no, you have to configure that via the Partitioning element in the configuration. Something like:

<?xml version="1.0" encoding="UTF-8" ?>
<CycloneDDS xmlns="https://cdds.io/config">
  <Domain Id="any">
    <General>
      <Interfaces>
        <NetworkInterface name="lo0" priority="default" multicast="true"/>
        <NetworkInterface name="en0" priority="default" multicast="true"/>
      </Interfaces>
    </General>
    <Partitioning>
      <NetworkPartitions>
        <NetworkPartition Name="a" Address="239.255.0.1"/>
        <NetworkPartition Name="b" Address="239.255.0.2"/>
        <NetworkPartition Name="c" Address="239.255.0.3"/>
      </NetworkPartitions>
      <PartitionMappings>
        <PartitionMapping DCPSPartitionTopic="a.*" NetworkPartition="a"/>
        <PartitionMapping DCPSPartitionTopic="b.*" NetworkPartition="b"/>
        <PartitionMapping DCPSPartitionTopic="*.*" NetworkPartition="c"/>
      </PartitionMappings>
    </Partitioning>
  </Domain>
</CycloneDDS>

[xiaoyuyaa555]

Thank you very much for your answer. I will configure it through XML.