I'm using the RTI Python Connector for v6.0 and want to write to an old system running v5.3. In the datawriter_qos I believe I have to specify the DataRepresentation for xcdr version 1. But I'm having trouble finding the exact syntax / keywords to use.
<qos_library name= .....
<qos_profile name= ....
<datawriter_qos>
<data_representation?>
<version?> "xcdr?" </version?>
</data_representation>