RTI Connext DDS Micro C API  Version 3.0.2
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Each DDS_DataReader maintains information about the state of its peer DDS_DataWriter (those it has matched with). Part of this state is which locaters (or destination addresses) it should use to send data to a particular DDS_DataWriter. The DDS_DataReaderResourceLimitsQosPolicy::max_routes_per_writer resource-limit limits the maximum number of routes that can be saved per DDS_DataWriter.
This resource-limit is shared across all matched DDS_DataWriter per DDS_DataReader. Thus, if DDS_DataReaderResourceLimitsQosPolicy::max_remote_writers is 2 and DDS_DataReaderResourceLimitsQosPolicy::max_routes_per_writer is 4, a total of 8 routes can be saved for both datawriters. One DDS_DataWriter may have 6 routes and the other 2.

RTI Connext DDS Micro C API Version 3.0.2 Copyright © Thu Dec 12 2019 Real-Time Innovations, Inc