RTI Connext DDS Micro C API  Version 3.0.2
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This resource-limit limits the maximum number of samples that can be cached for a single instance and must be less than or equal to max_samples and greater or equal to the history depth. When DDS_ResourceLimitsQosPolicy::max_samples_per_instance is higher than depth it makes it possible to loan samples and receive up to depth samples before returning loaned samples.
When this resource-limit or DDS_HistoryQosPolicy::depth is exceeded and the DDS_HistoryQosPolicy::kind is DDS_KEEP_LAST_HISTORY_QOS, the oldest sample is removed from the cache.

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