RTI Connext .NET API (legacy)  Version 6.1.1
DDS::DiscoveryConfigQosPolicy Class Reference

Settings for discovery configuration. More...

#include <managed_infrastructure.h>

Static Public Member Functions

static System::String ^ get_discoveryconfig_qos_policy_name ()
 Stringified human-readable name for DDS::DiscoveryConfigQosPolicy. More...
 

Public Attributes

Duration_t participant_liveliness_lease_duration
 The liveliness lease duration for the participant. More...
 
Duration_t participant_liveliness_assert_period
 The period to assert liveliness for the participant. More...
 
RemoteParticipantPurgeKind remote_participant_purge_kind
 The participant's behavior for maintaining knowledge of remote participants (and their contained entities) with which discovery communication has been lost. More...
 
Duration_t max_liveliness_loss_detection_period
 The maximum amount of time between when a remote entity stops maintaining its liveliness and when the matched local entity realizes that fact. More...
 
System::Int32 initial_participant_announcements
 The number of initial announcements sent when a participant is first enabled or when a remote participant is newly discovered. More...
 
Duration_t min_initial_participant_announcement_period
 The minimum period between initial announcements when a participant is first enabled or when a remote participant is newly discovered. More...
 
Duration_t max_initial_participant_announcement_period
 The maximum period between initial announcements when a participant is first enabled or when a remote participant is newly discovered. More...
 
BuiltinTopicReaderResourceLimits_t participant_reader_resource_limits
 Resource limits. More...
 
RtpsReliableReaderProtocol_t publication_reader
 RTPS protocol-related configuration settings for the RTPS reliable reader associated with a built-in publication reader. More...
 
BuiltinTopicReaderResourceLimits_t publication_reader_resource_limits
 Resource limits. More...
 
RtpsReliableReaderProtocol_t subscription_reader
 RTPS protocol-related configuration settings for the RTPS reliable reader associated with a built-in subscription reader. More...
 
BuiltinTopicReaderResourceLimits_t subscription_reader_resource_limits
 Resource limits. More...
 
RtpsReliableWriterProtocol_t publication_writer
 RTPS protocol-related configuration settings for the RTPS reliable writer associated with a built-in publication writer. More...
 
WriterDataLifecycleQosPolicy publication_writer_data_lifecycle
 Writer data lifecycle settings for a built-in publication writer. More...
 
RtpsReliableWriterProtocol_t subscription_writer
 RTPS protocol-related configuration settings for the RTPS reliable writer associated with a built-in subscription writer. More...
 
WriterDataLifecycleQosPolicy subscription_writer_data_lifecycle
 Writer data lifecycle settings for a built-in subscription writer. More...
 
System::Int32 builtin_discovery_plugins
 Mask of built-in discovery plugin kinds. More...
 
ReliabilityQosPolicyKind participant_message_reader_reliability_kind
 Reliability policy for a built-in participant message reader. More...
 
RtpsReliableReaderProtocol_t participant_message_reader
 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::ReliabilityQosPolicyKind::RELIABLE_RELIABILITY_QOS. More...
 
RtpsReliableWriterProtocol_t participant_message_writer
 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::ReliabilityQosPolicyKind::RELIABLE_RELIABILITY_QOS DDS::ReliabilityQosPolicyKind. More...
 
PublishModeQosPolicypublication_writer_publish_mode
 Publish mode policy for the built-in publication writer. More...
 
PublishModeQosPolicysubscription_writer_publish_mode
 Publish mode policy for the built-in subscription writer. More...
 
AsynchronousPublisherQosPolicyasynchronous_publisher
 Asynchronous publishing settings for the discovery DDS::Publisher and all entities that are created by it. More...
 
Duration_t default_domain_announcement_period
 The period to announce a participant to the default domain 0. More...
 
RtpsReliableWriterProtocol_t service_request_writer
 RTPS protocol-related configuration settings for the RTPS reliable writer associated with the built-in DDS::ServiceRequest writer. More...
 
WriterDataLifecycleQosPolicy service_request_writer_data_lifecycle
 Writer data lifecycle settings for a built-in DDS::ServiceRequest writer. More...
 
PublishModeQosPolicyservice_request_writer_publish_mode
 Publish mode policy for the built-in service request writer. More...
 
RtpsReliableReaderProtocol_t service_request_reader
 RTPS reliable reader protocol-related configuration settings for a built-in DDS::ServiceRequest reader. More...
 
Duration_t locator_reachability_assert_period
 Period at which this DomainParticipant will assert the locators discovered from other DomainParticipants. More...
 
Duration_t locator_reachability_lease_duration
 The time period after which other DomainParticipants can consider one of their locators as "unreachable" if they do not receive a REACHABILITY PING from this DomainParticipant. More...
 
Duration_t locator_reachability_change_detection_period
 Period at which this DomainParticipant will check if its locators are reachable from other DomainParticipants. More...
 
RtpsReliableWriterProtocol_t secure_volatile_writer
 RTPS protocol-related configuration settings for the RTPS reliable writer associated with the built-in secure volatile writer. More...
 
PublishModeQosPolicysecure_volatile_writer_publish_mode
 Publish mode policy for the built-in secure volatile writer. More...
 
RtpsReliableReaderProtocol_t secure_volatile_reader
 RTPS reliable reader protocol-related configuration settings for the built-in secure volatile reader. More...
 
System::Int32 endpoint_type_object_lb_serialization_threshold
 Option to reduce the size required to propagate a TypeObject in Simple Endpoint Discovery. More...
 
Duration_t dns_tracker_polling_period
 Duration that specifies the period used by the DNS tracker to poll the DNS service and check for changes in the hostnames. More...
 

Properties

System::Boolean ignore_default_domain_announcements [get, set]
 Used to ignore the announcements received by a participant on the default domain 0 corresponding to participants running on domains IDs other than 0. More...
 

Detailed Description

Settings for discovery configuration.

<<extension>> This QoS policy controls the amount of delay in discovering entities in the system and the amount of discovery traffic in the network.

The amount of network traffic required by the discovery process can vary widely, based on how your application has chosen to configure the middleware's network addressing (e.g., unicast vs. multicast, multicast TTL, etc.), the size of the system, whether all applications are started at the same time or whether start times are staggered, and other factors. Your application can use this policy to make tradeoffs between discovery completion time and network bandwidth utilization. In addition, you can introduce random back-off periods into the discovery process to decrease the probability of network contention when many applications start simultaneously.

Entity:
DDS::DomainParticipant
Properties:
RxO = N/A
Changeable = NO

Member Data Documentation

◆ participant_liveliness_lease_duration

Duration_t DDS::DiscoveryConfigQosPolicy::participant_liveliness_lease_duration

The liveliness lease duration for the participant.

This is the same as the expiration time of the DomainParticipant as defined in the RTPS protocol.

If the participant has not refreshed its own liveliness to other participants at least once within this period, it may be considered as stale by other participants in the network.

Should be strictly greater than DDS::DiscoveryConfigQosPolicy::participant_liveliness_assert_period.

[default] 100 seconds

[range] [1 nanosec,1 year], > participant_liveliness_assert_period

◆ participant_liveliness_assert_period

Duration_t DDS::DiscoveryConfigQosPolicy::participant_liveliness_assert_period

The period to assert liveliness for the participant.

The period at which the participant will refresh its liveliness to all the peers.

Should be strictly less than DDS::DiscoveryConfigQosPolicy::participant_liveliness_lease_duration.

[default] 30 seconds

[range] [1 nanosec,1 year), < participant_liveliness_lease_duration

◆ remote_participant_purge_kind

RemoteParticipantPurgeKind DDS::DiscoveryConfigQosPolicy::remote_participant_purge_kind

The participant's behavior for maintaining knowledge of remote participants (and their contained entities) with which discovery communication has been lost.

Most users will not need to change this value from its default, DDS::RemoteParticipantPurgeKind::LIVELINESS_BASED_REMOTE_PARTICIPANT_PURGE. However, DDS::RemoteParticipantPurgeKind::NO_REMOTE_PARTICIPANT_PURGE may be a good choice if the following conditions apply:

  1. Discovery communication with a remote participant may be lost while data communication remains intact. Such will not typically be the case if discovery takes place over the Simple Discovery Protocol, but may be the case if the RTI Enterprise Discovery Service is used.
  2. Extensive and prolonged lack of discovery communication between participants is not expected to be common, either because participant loss itself is expected to be rare, or because participants may be lost sporadically but will typically return again.
  3. Maintaining inter-participant liveliness is problematic, perhaps because a participant has no writers with the appropriate DDS::LivelinessQosPolicyKind.

[default] DDS::RemoteParticipantPurgeKind::LIVELINESS_BASED_REMOTE_PARTICIPANT_PURGE

◆ max_liveliness_loss_detection_period

Duration_t DDS::DiscoveryConfigQosPolicy::max_liveliness_loss_detection_period

The maximum amount of time between when a remote entity stops maintaining its liveliness and when the matched local entity realizes that fact.

Notification of the loss of liveliness of a remote entity may come more quickly that this duration, depending on the liveliness contract between the local and remote entities and the capabilities of the discovery mechanism in use. For example, a DDS::DataReader will learn of the loss of liveliness of a matched DDS::DataWriter within the reader's offered liveliness lease duration.

Shortening this duration will increase the responsiveness of entities to communication failures. However, it will also increase the CPU usage of the application, as the liveliness of remote entities will be examined more frequently.

[default] 60 seconds

[range] [1 nanosec, 1 year]

◆ initial_participant_announcements

System::Int32 DDS::DiscoveryConfigQosPolicy::initial_participant_announcements

The number of initial announcements sent when a participant is first enabled or when a remote participant is newly discovered.

Also, when a new remote participant appears, the local participant can announce itself to the peers multiple times controlled by this parameter.

[default] 5

[range] [0,1 million]

◆ min_initial_participant_announcement_period

Duration_t DDS::DiscoveryConfigQosPolicy::min_initial_participant_announcement_period

The minimum period between initial announcements when a participant is first enabled or when a remote participant is newly discovered.

A random delay between this and DDS::DiscoveryConfigQosPolicy::max_initial_participant_announcement_period is introduced in between initial announcements when a new remote participant is discovered.

The setting of DDS::DiscoveryConfigQosPolicy::min_initial_participant_announcement_period must be consistent with DDS::DiscoveryConfigQosPolicy::max_initial_participant_announcement_period. For these two values to be consistent, they must verify that:

DDS::DiscoveryConfigQosPolicy::min_initial_participant_announcement_period <= DDS::DiscoveryConfigQosPolicy::max_initial_participant_announcement_period.

[default] 1 second

[range] [1 nanosec,1 year]

◆ max_initial_participant_announcement_period

Duration_t DDS::DiscoveryConfigQosPolicy::max_initial_participant_announcement_period

The maximum period between initial announcements when a participant is first enabled or when a remote participant is newly discovered.

A random delay between DDS::DiscoveryConfigQosPolicy::min_initial_participant_announcement_period and this is introduced in between initial announcements when a new remote participant is discovered.

The setting of DDS::DiscoveryConfigQosPolicy::max_initial_participant_announcement_period must be consistent with DDS::DiscoveryConfigQosPolicy::min_initial_participant_announcement_period. For these two values to be consistent, they must verify that:

DDS::DiscoveryConfigQosPolicy::min_initial_participant_announcement_period <= DDS::DiscoveryConfigQosPolicy::max_initial_participant_announcement_period.

[default] 1 second

[range] [1 nanosec,1 year]

◆ participant_reader_resource_limits

BuiltinTopicReaderResourceLimits_t DDS::DiscoveryConfigQosPolicy::participant_reader_resource_limits

Resource limits.

Resource limit of the built-in topic participant reader. For details, see DDS::BuiltinTopicReaderResourceLimits_t.

◆ publication_reader

RtpsReliableReaderProtocol_t DDS::DiscoveryConfigQosPolicy::publication_reader

RTPS protocol-related configuration settings for the RTPS reliable reader associated with a built-in publication reader.

For details, refer to the DDS::RtpsReliableReaderProtocol_t

[default]
min_heartbeat_response_delay 0.0 seconds;
max_heartbeat_response_delay 0.0 seconds;
heartbeat_suppression_duration 0.0625 seconds;
nack_period 5.0 seconds;
receive_window_size 256;
round_trip_time 0.0 seconds;
app_ack_period 5.0 seconds;
samples_per_app_ack 1;

◆ publication_reader_resource_limits

BuiltinTopicReaderResourceLimits_t DDS::DiscoveryConfigQosPolicy::publication_reader_resource_limits

Resource limits.

Resource limit of the built-in topic publication reader. For details, see DDS::BuiltinTopicReaderResourceLimits_t.

◆ subscription_reader

RtpsReliableReaderProtocol_t DDS::DiscoveryConfigQosPolicy::subscription_reader

RTPS protocol-related configuration settings for the RTPS reliable reader associated with a built-in subscription reader.

For details, refer to the DDS::RtpsReliableReaderProtocol_t

[default]
min_heartbeat_response_delay 0.0 seconds;
max_heartbeat_response_delay 0.0 seconds;
heartbeat_suppression_duration 0.0625 seconds;
nack_period 5.0 seconds;
receive_window_size 256;
round_trip_time 0.0 seconds;
app_ack_period 5.0 seconds;
samples_per_app_ack 1;

◆ subscription_reader_resource_limits

BuiltinTopicReaderResourceLimits_t DDS::DiscoveryConfigQosPolicy::subscription_reader_resource_limits

Resource limits.

Resource limit of the built-in topic subscription reader. For details, see DDS::BuiltinTopicReaderResourceLimits_t.

◆ publication_writer

RtpsReliableWriterProtocol_t DDS::DiscoveryConfigQosPolicy::publication_writer

RTPS protocol-related configuration settings for the RTPS reliable writer associated with a built-in publication writer.

For details, refer to the DDS::RtpsReliableWriterProtocol_t

[default]
low_watermark 0;
high_watermark 1;
heartbeat_period 3.0 seconds;
fast_heartbeat_period 3.0 seconds;
late_joiner_heartbeat_period 3.0 seconds;
virtual_heartbeat_period DDS::Duration_t::DURATION_INFINITE;
samples_per_virtual_heartbeat DDS::ResourceLimitsQosPolicy::LENGTH_UNLIMITED;
max_heartbeat_retries 10;
inactivate_nonprogressing_readers false;
heartbeats_per_max_samples 8;
min_nack_response_delay 0.0 seconds;
max_nack_response_delay 0.0 seconds;
nack_suppression_duration 0.0 seconds;
max_bytes_per_nack_response 131072 bytes;
disable_positive_acks_min_sample_keep_duration 1.0 milliseconds;
disable_positive_acks_max_sample_keep_duration 1.0 seconds;
disable_positive_acks_enable_adaptive_sample_keep_duration true;
disable_positive_acks_decrease_sample_keep_duration_factor 95;
disable_positive_acks_increase_sample_keep_duration_factor 150;
min_send_window_size DDS::ResourceLimitsQosPolicy::LENGTH_UNLIMITED;
max_send_window_size DDS::ResourceLimitsQosPolicy::LENGTH_UNLIMITED;
send_window_update_period 3s;
send_window_increase_factor 105;
send_window_decrease_factor 50;
enable_multicast_periodic_heartbeat false;
multicast_resend_threshold 2 readers;
disable_repair_piggyback_heartbeat false;

◆ publication_writer_data_lifecycle

WriterDataLifecycleQosPolicy DDS::DiscoveryConfigQosPolicy::publication_writer_data_lifecycle

Writer data lifecycle settings for a built-in publication writer.

For details, refer to the DDS::WriterDataLifecycleQosPolicy. DDS::WriterDataLifecycleQosPolicy::autodispose_unregistered_instances will always be forced to true.

◆ subscription_writer

RtpsReliableWriterProtocol_t DDS::DiscoveryConfigQosPolicy::subscription_writer

RTPS protocol-related configuration settings for the RTPS reliable writer associated with a built-in subscription writer.

For details, refer to the DDS::RtpsReliableWriterProtocol_t

[default]
low_watermark 0;
high_watermark 1;
heartbeat_period 3.0 seconds;
fast_heartbeat_period 3.0 seconds;
late_joiner_heartbeat_period 3.0 seconds;
virtual_heartbeat_period DDS::Duration_t::DURATION_INFINITE;
samples_per_virtual_heartbeat DDS::ResourceLimitsQosPolicy::LENGTH_UNLIMITED;
max_heartbeat_retries 10;
inactivate_nonprogressing_readers false;
heartbeats_per_max_samples 8;
min_nack_response_delay 0.0 seconds;
max_nack_response_delay 0.0 seconds;
nack_suppression_duration 0.0 seconds;
max_bytes_per_nack_response 131072 bytes;
disable_positive_acks_min_sample_keep_duration 1.0 milliseconds;
disable_positive_acks_max_sample_keep_duration 1.0 seconds;
disable_positive_acks_enable_adaptive_sample_keep_duration true;
disable_positive_acks_decrease_sample_keep_duration_factor 95;
disable_positive_acks_increase_sample_keep_duration_factor 150;
min_send_window_size DDS::ResourceLimitsQosPolicy::LENGTH_UNLIMITED;
max_send_window_size DDS::ResourceLimitsQosPolicy::LENGTH_UNLIMITED;
send_window_update_period 3s;
send_window_increase_factor 105;
send_window_decrease_factor 50;
enable_multicast_periodic_heartbeat false;
multicast_resend_threshold 2 readers;
disable_repair_piggyback_heartbeat false;

◆ subscription_writer_data_lifecycle

WriterDataLifecycleQosPolicy DDS::DiscoveryConfigQosPolicy::subscription_writer_data_lifecycle

Writer data lifecycle settings for a built-in subscription writer.

For details, refer to the DDS::WriterDataLifecycleQosPolicy. DDS::WriterDataLifecycleQosPolicy::autodispose_unregistered_instances will always be forced to true.

◆ builtin_discovery_plugins

System::Int32 DDS::DiscoveryConfigQosPolicy::builtin_discovery_plugins

Mask of built-in discovery plugin kinds.

There are several built-in discovery plugins. This mask enables the different plugins. Any plugin not enabled will not be created.

[default] DDS::DiscoveryConfigBuiltinPluginKind::DISCOVERYCONFIG_BUILTIN_SDP

See also
DDS::DiscoveryConfigBuiltinPluginKind

◆ participant_message_reader_reliability_kind

ReliabilityQosPolicyKind DDS::DiscoveryConfigQosPolicy::participant_message_reader_reliability_kind

Reliability policy for a built-in participant message reader.

For details, refer to the DDS::ReliabilityQosPolicyKind.

[default] DDS::ReliabilityQosPolicyKind::BEST_EFFORT_RELIABILITY_QOS

◆ participant_message_reader

RtpsReliableReaderProtocol_t DDS::DiscoveryConfigQosPolicy::participant_message_reader

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::ReliabilityQosPolicyKind::RELIABLE_RELIABILITY_QOS.

For details, refer to the DDS::RtpsReliableReaderProtocol_t

[default]
min_heartbeat_response_delay 0.0 seconds;
max_heartbeat_response_delay 0.0 seconds;
heartbeat_suppression_duration 0.0625 seconds;
nack_period 5.0 seconds;
receive_window_size 256;
round_trip_time 0.0 seconds;
app_ack_period 5.0 seconds;
samples_per_app_ack 1;

◆ participant_message_writer

RtpsReliableWriterProtocol_t DDS::DiscoveryConfigQosPolicy::participant_message_writer

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::ReliabilityQosPolicyKind::RELIABLE_RELIABILITY_QOS DDS::ReliabilityQosPolicyKind.

For details, refer to the DDS::RtpsReliableWriterProtocol_t

[default]
low_watermark 0;
high_watermark 1;
heartbeat_period 1.0 seconds;
fast_heartbeat_period 1.0 seconds;
late_joiner_heartbeat_period 1.0 seconds;
virtual_heartbeat_period DDS::Duration_t::DURATION_INFINITE;
samples_per_virtual_heartbeat DDS::ResourceLimitsQosPolicy::LENGTH_UNLIMITED;
max_heartbeat_retries 10;
inactivate_nonprogressing_readers false;
heartbeats_per_max_samples 1;
min_nack_response_delay 0.0 seconds;
max_nack_response_delay 0.0 seconds;
nack_suppression_duration 0.0 seconds;
max_bytes_per_nack_response 9216 bytes;
disable_positive_acks_min_sample_keep_duration 1.0 milliseconds;
disable_positive_acks_max_sample_keep_duration 1.0 seconds;
disable_positive_acks_enable_adaptive_sample_keep_duration true;
disable_positive_acks_decrease_sample_keep_duration_factor 95;
disable_positive_acks_increase_sample_keep_duration_factor 150;
min_send_window_size DDS::ResourceLimitsQosPolicy::LENGTH_UNLIMITED;
max_send_window_size DDS::ResourceLimitsQosPolicy::LENGTH_UNLIMITED;
send_window_update_period 1s;
send_window_increase_factor 105;
send_window_decrease_factor 50;
enable_multicast_periodic_heartbeat false;
multicast_resend_threshold 2 readers;
disable_repair_piggyback_heartbeat false;

◆ publication_writer_publish_mode

PublishModeQosPolicy ^ DDS::DiscoveryConfigQosPolicy::publication_writer_publish_mode

Publish mode policy for the built-in publication writer.

Determines whether the Discovery built-in publication DDS::DataWriter publishes data synchronously or asynchronously and how.

◆ subscription_writer_publish_mode

PublishModeQosPolicy ^ DDS::DiscoveryConfigQosPolicy::subscription_writer_publish_mode

Publish mode policy for the built-in subscription writer.

Determines whether the Discovery built-in subscription DDS::DataWriter publishes data synchronously or asynchronously and how.

◆ asynchronous_publisher

AsynchronousPublisherQosPolicy ^ DDS::DiscoveryConfigQosPolicy::asynchronous_publisher

Asynchronous publishing settings for the discovery DDS::Publisher and all entities that are created by it.

◆ default_domain_announcement_period

Duration_t DDS::DiscoveryConfigQosPolicy::default_domain_announcement_period

The period to announce a participant to the default domain 0.

The period at which a participant will announce itself to the default domain 0 using the default UDPv4 multicast group address for discovery traffic on that domain.

For domain 0, the default discovery multicast address is 239.255.0.1:7400.

To disable announcement to the default domain, set this period to DDS::Duration_t::DURATION_INFINITE.

When this period is set to a value other than DDS::Duration_t::DURATION_INFINITE and DDS::DiscoveryConfigQosPolicy::ignore_default_domain_announcements is set to false, you can get information about participants running in different domains by creating a participant in domain 0 and implementing the on_data_available callback in the DDS::ParticipantBuiltinTopicData built-in DataReader's listener.

You can learn the domain ID associated with a participant by looking at the field DDS::ParticipantBuiltinTopicData::domain_id.

[default] 30 seconds

[range] [1 nanosec,1 year] or DDS::Duration_t::DURATION_INFINITE

See also
DDS::ParticipantBuiltinTopicData::domain_id
DDS::DiscoveryConfigQosPolicy::ignore_default_domain_announcements

◆ service_request_writer

RtpsReliableWriterProtocol_t DDS::DiscoveryConfigQosPolicy::service_request_writer

RTPS protocol-related configuration settings for the RTPS reliable writer associated with the built-in DDS::ServiceRequest writer.

For details, refer to the DDS::RtpsReliableWriterProtocol_t

[default]
low_watermark 0;
high_watermark 1;
heartbeat_period 3.0 seconds;
fast_heartbeat_period 3.0 seconds;
late_joiner_heartbeat_period 3.0 seconds;
virtual_heartbeat_period DDS::Duration_t::DURATION_INFINITE;
samples_per_virtual_heartbeat DDS::ResourceLimitsQosPolicy::LENGTH_UNLIMITED;
max_heartbeat_retries 10;
inactivate_nonprogressing_readers false;
heartbeats_per_max_samples 8;
min_nack_response_delay 0.0 seconds;
max_nack_response_delay 0.0 seconds;
nack_suppression_duration 0.0 seconds;
max_bytes_per_nack_response 131072 bytes;
disable_positive_acks_min_sample_keep_duration 1.0 milliseconds;
disable_positive_acks_max_sample_keep_duration 1.0 seconds;
disable_positive_acks_enable_adaptive_sample_keep_duration true;
disable_positive_acks_decrease_sample_keep_duration_factor 95;
disable_positive_acks_increase_sample_keep_duration_factor 150;
min_send_window_size DDS::ResourceLimitsQosPolicy::LENGTH_UNLIMITED;
max_send_window_size DDS::ResourceLimitsQosPolicy::LENGTH_UNLIMITED;
send_window_update_period 3s;
send_window_increase_factor 105;
send_window_decrease_factor 50;
enable_multicast_periodic_heartbeat false;
multicast_resend_threshold 2 readers;
disable_repair_piggyback_heartbeat false;

◆ service_request_writer_data_lifecycle

WriterDataLifecycleQosPolicy DDS::DiscoveryConfigQosPolicy::service_request_writer_data_lifecycle

Writer data lifecycle settings for a built-in DDS::ServiceRequest writer.

For details, refer to the DDS::WriterDataLifecycleQosPolicy.

◆ service_request_writer_publish_mode

PublishModeQosPolicy ^ DDS::DiscoveryConfigQosPolicy::service_request_writer_publish_mode

Publish mode policy for the built-in service request writer.

Determines whether the Discovery built-in service request DDS::DataWriter publishes data synchronously or asynchronously and how.

◆ service_request_reader

RtpsReliableReaderProtocol_t DDS::DiscoveryConfigQosPolicy::service_request_reader

RTPS reliable reader protocol-related configuration settings for a built-in DDS::ServiceRequest reader.

For details, refer to the DDS::RtpsReliableReaderProtocol_t

[default]
min_heartbeat_response_delay 0.0 seconds;
max_heartbeat_response_delay 0.0 seconds;
heartbeat_suppression_duration 0.0625 seconds;
nack_period 5.0 seconds;
receive_window_size 256;
round_trip_time 0.0 seconds;
app_ack_period 5.0 seconds;
samples_per_app_ack 1;

◆ locator_reachability_assert_period

Duration_t DDS::DiscoveryConfigQosPolicy::locator_reachability_assert_period

Period at which this DomainParticipant will assert the locators discovered from other DomainParticipants.

This setting configures the period at which this DDS::DomainParticipant will ping all the locators that it has discovered from other DomainParticipants. This period should be strictly less than DDS::DiscoveryConfigQosPolicy::locator_reachability_lease_duration.

If DDS::DiscoveryConfigQosPolicy::locator_reachability_lease_duration is DDS::Duration_t::DURATION_INFINITE this parameter is ignored. The DomainParticipant will not assert remote locators.

[default] 20 seconds

[range] [1 nanosec,1 year]

See also
DDS::DiscoveryConfigQosPolicy::locator_reachability_lease_duration

◆ locator_reachability_lease_duration

Duration_t DDS::DiscoveryConfigQosPolicy::locator_reachability_lease_duration

The time period after which other DomainParticipants can consider one of their locators as "unreachable" if they do not receive a REACHABILITY PING from this DomainParticipant.

For the purpose of this explanation, we will use 'local' to refer to the DomainParticipant in which we configure locator_reachability_lease_duration and 'remote' to refer to the other DomainParticipants communicating with the local DomainParticipant.

This setting configures a timeout announced to the remote DomainParticipants. This timeout is used by the remote DomainParticipants as the maximum period by which a remote locator must be asserted by the local DomainParticipant (through a REACHABILITY PING message) before considering this locator as "unreachable" from the local DomainParticipant.

When a remote DomainParticipant detects that one of its locators is not reachable from the local DomainParticipant, it will notify the local DomainParticipant of this event. From that moment on, and until notified otherwise, the local DomainParticipant will not send RTPS messages to remote DomainParticipants using this locator.

If this value is set to DDS::Duration_t::DURATION_INFINITE, the local DomainParticipant will send RTPS messages to a remote DomainParticipant on the locators announced by the remote DomainParticipant, regardless of whether or not the remote DomainParticipant can be reached using these locators.

[default] DDS::Duration_t::DURATION_INFINITE

[range] [1 nanosec,1 year] or DDS::Duration_t::DURATION_INFINITE

◆ locator_reachability_change_detection_period

Duration_t DDS::DiscoveryConfigQosPolicy::locator_reachability_change_detection_period

Period at which this DomainParticipant will check if its locators are reachable from other DomainParticipants.

This setting determines the maximum period at which this DomainParticipant will check to see if its locators are reachable from other DomainParticipants according to the other DomainParticipants' DDS::DiscoveryConfigQosPolicy::locator_reachability_lease_duration value.

If DDS::DiscoveryConfigQosPolicy::locator_reachability_lease_duration is DDS::Duration_t::DURATION_INFINITE this parameter is ignored. The DomainParticipant will not schedule an event to see if its locators are reachable from other DomainParticipants.

[default] 60 seconds

[range] [1 nanosec,1 year]

See also
DDS::DiscoveryConfigQosPolicy::locator_reachability_lease_duration

◆ secure_volatile_writer

RtpsReliableWriterProtocol_t DDS::DiscoveryConfigQosPolicy::secure_volatile_writer

RTPS protocol-related configuration settings for the RTPS reliable writer associated with the built-in secure volatile writer.

For details, refer to the DDS::RtpsReliableWriterProtocol_t

[default]
low_watermark 0;
high_watermark 1;
heartbeat_period 1.0 second;
fast_heartbeat_period 250.0 milliseconds;
late_joiner_heartbeat_period 1.0 second;
virtual_heartbeat_period DDS::Duration_t::DURATION_INFINITE;
samples_per_virtual_heartbeat DDS::ResourceLimitsQosPolicy::LENGTH_UNLIMITED;
max_heartbeat_retries DDS::ResourceLimitsQosPolicy::LENGTH_UNLIMITED;
inactivate_nonprogressing_readers false;
heartbeats_per_max_samples 1;
min_nack_response_delay 0.0 seconds;
max_nack_response_delay 0.0 seconds;
nack_suppression_duration 0.0 seconds;
max_bytes_per_nack_response 9216 bytes;
disable_positive_acks_min_sample_keep_duration 1.0 millisecond;
disable_positive_acks_max_sample_keep_duration 1.0 second;
disable_positive_acks_enable_adaptive_sample_keep_duration true;
disable_positive_acks_decrease_sample_keep_duration_factor 95;
disable_positive_acks_increase_sample_keep_duration_factor 150;
min_send_window_size DDS::ResourceLimitsQosPolicy::LENGTH_UNLIMITED;
max_send_window_size DDS::ResourceLimitsQosPolicy::LENGTH_UNLIMITED;
send_window_update_period 1.0 second;
send_window_increase_factor 105;
send_window_decrease_factor 50;
enable_multicast_periodic_heartbeat false;
multicast_resend_threshold 2 readers;
disable_repair_piggyback_heartbeat false;

◆ secure_volatile_writer_publish_mode

PublishModeQosPolicy ^ DDS::DiscoveryConfigQosPolicy::secure_volatile_writer_publish_mode

Publish mode policy for the built-in secure volatile writer.

Determines whether the built-in secure volatile DDS::DataWriter publishes data synchronously or asynchronously and how.

◆ secure_volatile_reader

RtpsReliableReaderProtocol_t DDS::DiscoveryConfigQosPolicy::secure_volatile_reader

RTPS reliable reader protocol-related configuration settings for the built-in secure volatile reader.

For details, refer to the DDS::RtpsReliableReaderProtocol_t

[default]
min_heartbeat_response_delay 0.0 seconds;
max_heartbeat_response_delay 0.0 seconds;
heartbeat_suppression_duration 0.0625 seconds;
nack_period 5.0 seconds;
receive_window_size 256;
round_trip_time 0.0 seconds;
app_ack_period 5.0 seconds;
samples_per_app_ack 1;

◆ endpoint_type_object_lb_serialization_threshold

System::Int32 DDS::DiscoveryConfigQosPolicy::endpoint_type_object_lb_serialization_threshold

Option to reduce the size required to propagate a TypeObject in Simple Endpoint Discovery.

Minimum size (in bytes) of the serialized TypeObject that will trigger the serialization of a TypeObjectLb instead of the regular TypeObject.

For example, setting this property to 1000 will trigger the serialization of the TypeObjectLb for TypeObjects whose serialized size is greater than 1000 Bytes.

The sentinel value -1 disables TypeObject compression.

[default] 0. The default value 0 enables TypeObject compression by always sending TypeObjectLb.

[range] [-1, 2147483647]

◆ dns_tracker_polling_period

Duration_t DDS::DiscoveryConfigQosPolicy::dns_tracker_polling_period

Duration that specifies the period used by the DNS tracker to poll the DNS service and check for changes in the hostnames.

RTI Connext allows the use of hostnames instead of IP addresses when configuring initial peers for specific transports (e.g.: UDPv4 and UDPv6). The DNS tracker keeps the IP addresses of these hostnames updated. The DNS tracker builds a list of hostnames from the initial peers of a DomainParticipant, queries the DNS for those hostnames, and updates the resolved IP addresses when the IP addresses change. The frequency of these queries is defined by the DNS tracker polling period. When the period is set to DDS::Duration_t::DURATION_INFINITE, the tracker is disabled.

RTI Connext keeps information regarding the hostnames of peers if they are part of the DDS::DiscoveryQosPolicy::initial_peers. The information regarding peers added through the DDS::DomainParticipant::add_peer operation is kept only if the DNS tracker has been enabled before adding a peer.

[default] DDS::Duration_t::DURATION_INFINITE

[range] [1 second,1 year], DDS::Duration_t::DURATION_INFINITE

Property Documentation

◆ ignore_default_domain_announcements

System:: Boolean DDS::DiscoveryConfigQosPolicy::ignore_default_domain_announcements
getset

Used to ignore the announcements received by a participant on the default domain 0 corresponding to participants running on domains IDs other than 0.

This setting only applies to participants running on the default domain 0 and using the default port mapping.

When this setting is set to true, a participant running on the default domain 0 will ignore announcements from participants running on different domain IDs.

When this setting is set to false, a participant running on the default domain 0 will provide announcements from participants running on different domain IDs to the application via the DDS::ParticipantBuiltinTopicData built-in DataReader.

[default] true

See also
DDS::ParticipantBuiltinTopicData::domain_id
DDS::DiscoveryConfigQosPolicy::default_domain_announcement_period