These QoS are applied per-instance.

For example, the dds::core::policy::History::depth configures the number of samples that are stored in the DataWriter and DataReader queues per-instance.

Basic Settings


dds::core::policy::Durability	writer_depth
	<<basic>> <<extension>> Indicates the number of samples per instance that a durable dds::pub::DataWriter will send to a late-joining dds::sub::DataReader.

dds::core::policy::Deadline	period
	<<basic>> <<spec>> Duration of the deadline period.

dds::core::policy::Ownership	kind
	<<basic>> <<spec>> The kind of ownership

dds::core::policy::OwnershipStrength	value
	<<basic>> <<spec>> The strength value used to arbitrate among multiple writers.

dds::core::policy::TimeBasedFilter	minimum_separation
	<<basic>> <<spec>> The minimum separation duration between subsequent samples.

dds::core::policy::DestinationOrder	kind
	<<basic>> <<spec>> Specifies the desired kind of destination order.

dds::core::policy::History	kind
	<<basic>> <<spec>> Specifies the kind of history to be kept.

dds::core::policy::History	depth
	<<basic>> <<spec>> Specifies the number of samples per instance to be kept, when the `kind` is dds::core::policy::HistoryKind::KEEP_LAST

Advanced Settings


dds::core::policy::DurabilityService	history_kind
	<<spec>> The kind of history to apply in recouping durable data.

dds::core::policy::DurabilityService	history_depth
	<<spec>> Setting to use for the dds::core::policy::Durability::writer_depth when recouping durable data.

dds::core::policy::Presentation	access_scope
	<<spec>> Determines the largest scope spanning the entities for which the order and coherency of changes can be preserved.

dds::core::policy::Presentation	ordered_access
	<<spec>> Specifies support for ordered access to the samples received at the subscription end. Controls whether ordered access is supported within the scope `access_scope`.

dds::core::policy::DestinationOrder	scope
	<<spec>> Specifies the desired scope of the source destination order.

dds::core::policy::DestinationOrder	source_timestamp_tolerance
	<<extension>> Allowed tolerance between source timestamps of consecutive samples.