Liveliness

Use these QoS fields to manage the liveliness of participants and endpoints, ensuring active communication and timely updates of the system state.

Use these QoS fields to manage the liveliness of participants and endpoints, ensuring active communication and timely updates of the system state.

Basic Settings

DDS_LivelinessQosPolicy	kind
	<<basic>> <<spec>> The kind of liveliness desired.
DDS_LivelinessQosPolicy	lease_duration
	<<basic>> <<spec>> The duration within which a DDSDataWriter must be asserted, or else it is assumed to be not alive.
DDS_LivelinessQosPolicy	assertions_per_lease_duration
	<<basic>> <<extension>> The number of assertions a DDSDataWriter will send during a its DDS_LivelinessQosPolicy::lease_duration.
DDS_DiscoveryConfigQosPolicy	participant_liveliness_lease_duration
	<<basic>> <<extension>> The liveliness lease duration for the participant.
DDS_DiscoveryConfigQosPolicy	participant_liveliness_assert_period
	<<basic>> <<extension>> The period to assert liveliness for the participant.

Advanced Settings

DDS_DataReaderResourceLimitsQosPolicy	autopurge_remote_not_alive_writer_delay
	<<extension>> Maximum duration for which the DDSDataReader will maintain information regarding a DDSDataWriter once the DDSDataWriter has become not alive.
DDS_DiscoveryConfigQosPolicy	remote_participant_purge_kind
	[DEPRECATED] <<extension>> The participant's behavior for maintaining knowledge of remote participants (and their contained entities) with which discovery communication has been lost.
DDS_DiscoveryConfigQosPolicy	max_liveliness_loss_detection_period
	[DEPRECATED] <<extension>> The maximum amount of time between when a remote entity stops maintaining its liveliness and when the matched local entity realizes that fact.
DDS_DiscoveryConfigQosPolicy	participant_message_writer
	<<extension>> RTPS protocol-related configuration settings for the RTPS reliable writer associated with the built-in participant message writer. This parameter only has effect if the matching participant message reader is configured with DDS_RELIABLE_RELIABILITY_QOS DDS_ReliabilityQosPolicyKind.
DDS_DiscoveryConfigQosPolicy	participant_message_reader_reliability_kind
	[DEPRECATED] <<extension>> Reliability policy for a built-in participant message reader.
DDS_DiscoveryConfigQosPolicy	participant_message_reader
	<<extension>> RTPS reliable reader protocol-related configuration settings for a built-in participant message reader. This parameter only has effect if DDS_DiscoveryConfigQosPolicy::participant_message_reader_reliability_kind is set to DDS_RELIABLE_RELIABILITY_QOS.
DDS_RtpsReliableWriterProtocol_t	max_heartbeat_retries
	<<extension>> The maximum number of periodic heartbeat retries before marking a remote reader as inactive.
DDS_RtpsReliableWriterProtocol_t	inactivate_nonprogressing_readers
	<<extension>> Whether to treat remote readers as inactive when their NACKs do not progress