How do I set the multicast_receive_addresses when using rtiddsping and rtiddsspy?

Submitted by vishal on Thu, 01/17/2013 - 13:01

 Note: Applies to RTI Data Distribution Service 4.3x and above,

Both rtiddsping and rtiddsspy can be configured to use multicast for discovery announcements by specifying a multicast address as part of the initial peer list (using -preer <PEER>).

However, rtiddsping and rtiddsspy do not have command-line options to modify multicast_receive_addresses (this is a known issue, RTI bug # 12462). As a result, rtiddsping and rtiddsspy always use the default multicast address, 239.255.0.1.

In version 4.4b and higher, there is a workaround to this problem. You can use the attribute, is_default_qos, in a <qos_profile> tag to overwrite the default QoS values, including multicast_receive_addresses. For example:

<dds>
    <qos_library name="foo_Library">
        <qos_profile name="foo_Profile" is_default_qos="true">
        <!-- QoS to configure data writer created in the example code -->
            <participant_qos>
                <discovery>
                    <initial_peers>
                        <element>shmem://</element>
                        <element>builtin.udpv4://127.0.0.1</element>
                        <!-- NEW, non-default multicast -->
                        <element>239.255.1.2</element> 
                    </initial_peers>
                    <multicast_receive_addresses>
                        <!-- NEW, non-default multicast receive address -->
                        <element>239.255.1.2</element>
                    </multicast_receive_addresses>
                </discovery>
            </participant_qos>
        </qos_profile>
    </qos_library>
</dds>
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