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# Troubleshooting | ||
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This document compiles the known compatibility issues with other Shapes Demo implementations and the possible solutions. | ||
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## Two instances in the same computer | ||
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When using eProsima ShapesDemo and RTI Shapes Demo in the same computer the file RTI_SHAPES_DEMO_QOS_PROFILES.xml needs to be modified to force RTI to only use UDPv4 as transport. | ||
The user should add the following lines inside the Shapes_Default_Profile qos_profile tag. | ||
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<participant_qos> | ||
<transport_builtin><mask>UDPv4</mask></transport_builtin> | ||
<discovery_config> | ||
<builtin_discovery_plugins>SDP</builtin_discovery_plugins> | ||
<participant_liveliness_lease_duration> | ||
<sec>30</sec> | ||
<nanosec>0</nanosec> | ||
</participant_liveliness_lease_duration> | ||
</discovery_config> | ||
</participant_qos> | ||
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This setting is necessary to avoid the use of Shared Memory as transport (disabling the loopback), a feature that is not yet implemented in Fast RTPS. |
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