Enum ReliabilityQosPolicyKind, different kinds of reliability for ReliabilityQosPolicy.
Indicates that it is acceptable to not retry propagation of any samples. Presumably new values for the samples are generated often enough that it is not necessary to re-send or acknowledge any samples
Specifies the Service will attempt to deliver all samples in its history. Missed samples may be retried. In steady-state (no modifications communicated via the DataWriter) the middleware guarantees that all samples in the DataWriter history will eventually be delivered to all the DataReader objects. Outside steady state the HistoryQosPolicy and ResourceLimitsQosPolicy will determine how samples become part of the history and whether samples can be discarded from it.