Built-in Topics

Built-in objects created by RTI Connext but accessible to the application. More...

Modules
	Participant Built-in Topics
	Builtin topic for accessing information about the DomainParticipants discovered by RTI Connext.
	Topic Built-in Topics
	Builtin topic for accessing information about the Topics discovered by RTI Connext.
	Publication Built-in Topics
	Builtin topic for accessing information about the Publications discovered by RTI Connext.
	Subscription Built-in Topics
	Builtin topic for accessing information about the Subscriptions discovered by RTI Connext.

Data Structures
struct	DDS_Locator_t
	<<eXtension>> Type used to represent the addressing information needed to send a message to an RTPS Endpoint using one of the supported transports. More...
struct	DDS_LocatorSeq
	Declares IDL sequence < DDS_Locator_t > More...
struct	DDS_ProtocolVersion_t
	<<eXtension>> Type used to represent the version of the RTPS protocol. More...
struct	DDS_VendorId_t
	<<eXtension>> Type used to represent the vendor of the service implementing the RTPS protocol. More...
struct	DDS_ProductVersion_t
	<<eXtension>> Type used to represent the current version of RTI Connext. More...
struct	DDS_BuiltinTopicKey_t
	The key type of the built-in topic types. More...
struct	DDS_ContentFilterProperty_t
	<<eXtension>> Type used to provide all the required information to enable content filtering. More...

Macros
#define	DDS_LOCATOR_ADDRESS_LENGTH_MAX   16
	Declares length of address field in locator.
#define	DDS_PROTOCOLVERSION_1_0   { 1, 0 }
	The protocol version 1.0.
#define	DDS_PROTOCOLVERSION_1_1   { 1, 1 }
	The protocol version 1.1.
#define	DDS_PROTOCOLVERSION_1_2   { 1, 2 }
	The protocol version 1.2.
#define	DDS_PROTOCOLVERSION_2_0   { 2, 0 }
	The protocol version 2.0.
#define	DDS_PROTOCOLVERSION_2_1   { 2, 1 }
	The protocol version 2.1.
#define	DDS_PROTOCOLVERSION   { 2, 1 }
	The most recent protocol version. Currently 1.2.
#define	DDS_VENDOR_ID_LENGTH_MAX   2
	Length of vendor id.
#define	DDS_PRODUCTVERSION_UNKNOWN   { 0, 0, 0, 0 }
	The value used when the product version is unknown.

Typedefs
typedef struct DDS_ProtocolVersion_t	DDS_ProtocolVersion_t
	<<eXtension>> Type used to represent the version of the RTPS protocol.
typedef struct DDS_BuiltinTopicKey_t	DDS_BuiltinTopicKey_t
	The key type of the built-in topic types.

Variables
struct DDS_Locator_t	DDS_LOCATOR_INVALID
	An invalid locator.
const DDS_Long	DDS_LOCATOR_KIND_INVALID
	Locator of this kind is invalid.
const DDS_UnsignedLong	DDS_LOCATOR_PORT_INVALID
	An invalid port.
const DDS_Octet	DDS_LOCATOR_ADDRESS_INVALID [DDS_LOCATOR_ADDRESS_LENGTH_MAX]
	An invalid address.
const DDS_Long	DDS_LOCATOR_KIND_UDPv4
	A locator for a UDPv4 address.
const DDS_Long	DDS_LOCATOR_KIND_SHMEM
	A locator for an address acessed via shared memory.
const DDS_Long	DDS_LOCATOR_KIND_UDPv6
	A locator for a UDPv6 address.
const DDS_Long	DDS_LOCATOR_KIND_RESERVED
	Locator of this kind is reserved.

Detailed Description

Built-in objects created by RTI Connext but accessible to the application.

RTI Connext must discover and keep track of the remote entities, such as new participants in the domain. This information may also be important to the application, which may want to react to this discovery, or else access it on demand.

A set of built-in topics and corresponding DDS_DataReader objects are introduced to be used by the application to access these discovery information.

The information can be accessed as if it was normal application data. This allows the application to know when there are any changes in those values by means of the DDS_Listener or the DDS_Condition mechanisms.

The built-in data-readers all belong to a built-in DDS_Subscriber, which can be retrieved by using the function DDS_DomainParticipant_get_builtin_subscriber. The built-in DDS_DataReader objects can be retrieved by using the operation DDS_Subscriber_lookup_datareader, with the topic name as a parameter.

Built-in entities have default listener settings as well. The built-in DDS_Subscriber and all of its built-in topics have 'nil' listeners with all statuses appearing in their listener masks (acting as a NO-OP listener that does not reset communication status). The built-in DataReaders have null listeners with no statuses in their masks.

The information that is accessible about the remote entities by means of the built-in topics includes all the QoS policies that apply to the corresponding remote Entity. This QoS policies appear as normal 'data' fields inside the data read by means of the built-in Topic. Additional information is provided to identify the Entity and facilitate the application logic.

The built-in DDS_DataReader will not provide data pertaining to entities created from the same DDS_DomainParticipant under the assumption that such entities are already known to the application that created them.

Refer to DDS_ParticipantBuiltinTopicData, DDS_TopicBuiltinTopicData, DDS_SubscriptionBuiltinTopicData and DDS_PublicationBuiltinTopicData for a description of all the built-in topics and their contents.

The QoS of the built-in DDS_Subscriber and DDS_DataReader objects is given by the following table:

QoS of built-in DDS_Subscriber and DDS_DataReader

QoS	Value
DDS_UserDataQosPolicy	0-length sequence
DDS_TopicDataQosPolicy	0-length sequence
DDS_GroupDataQosPolicy	0-length sequence
DDS_DurabilityQosPolicy	DDS_TRANSIENT_LOCAL_DURABILITY_QOS
DDS_DurabilityServiceQosPolicy	Does not apply as DDS_DurabilityQosPolicyKind is DDS_TRANSIENT_LOCAL_DURABILITY_QOS
DDS_PresentationQosPolicy	access_scope = DDS_TOPIC_PRESENTATION_QOS coherent_access = DDS_BOOLEAN_FALSE ordered_access = DDS_BOOLEAN_FALSE
DDS_DeadlineQosPolicy	Period = infinite
DDS_LatencyBudgetQosPolicy	duration = 0
DDS_OwnershipQosPolicy	DDS_SHARED_OWNERSHIP_QOS
DDS_OwnershipStrengthQosPolicy	value = 0
DDS_LivelinessQosPolicy	kind = DDS_AUTOMATIC_LIVELINESS_QOS lease_duration = 0
DDS_TimeBasedFilterQosPolicy	minimum_separation = 0
DDS_PartitionQosPolicy	0-length sequence
DDS_ReliabilityQosPolicy	kind = DDS_RELIABLE_RELIABILITY_QOS max_blocking_time = 100 milliseconds
DDS_DestinationOrderQosPolicy	DDS_BY_RECEPTION_TIMESTAMP_DESTINATIONORDER_QOS
DDS_HistoryQosPolicy	kind = DDS_KEEP_LAST_HISTORY_QOS depth = 1
DDS_ResourceLimitsQosPolicy	max_samples = DDS_LENGTH_UNLIMITED max_instances = DDS_LENGTH_UNLIMITED max_samples_per_instance = DDS_LENGTH_UNLIMITED
DDS_ReaderDataLifecycleQosPolicy	autopurge_nowriter_samples_delay = infinite autopurge_disposed_samples_delay = infinite
DDS_EntityFactoryQosPolicy	autoenable_created_entities = DDS_BOOLEAN_TRUE

Macro Definition Documentation

#define DDS_LOCATOR_ADDRESS_LENGTH_MAX   16

Declares length of address field in locator.

#define DDS_PROTOCOLVERSION_1_0   { 1, 0 }

The protocol version 1.0.

#define DDS_PROTOCOLVERSION_1_1   { 1, 1 }

The protocol version 1.1.

#define DDS_PROTOCOLVERSION_1_2   { 1, 2 }

The protocol version 1.2.

#define DDS_PROTOCOLVERSION_2_0   { 2, 0 }

The protocol version 2.0.

#define DDS_PROTOCOLVERSION_2_1   { 2, 1 }

The protocol version 2.1.

#define DDS_PROTOCOLVERSION   { 2, 1 }

The most recent protocol version. Currently 1.2.

#define DDS_VENDOR_ID_LENGTH_MAX   2

Length of vendor id.

#define DDS_PRODUCTVERSION_UNKNOWN   { 0, 0, 0, 0 }

The value used when the product version is unknown.

Typedef Documentation

typedef struct DDS_ProtocolVersion_t DDS_ProtocolVersion_t

<<eXtension>> Type used to represent the version of the RTPS protocol.

typedef struct DDS_BuiltinTopicKey_t DDS_BuiltinTopicKey_t

The key type of the built-in topic types.

Each remote DDS_Entity to be discovered is can be uniquely identified by this key. This is the key of all the built-in topic data types.

See Also

DDS_ParticipantBuiltinTopicData

DDS_TopicBuiltinTopicData

DDS_PublicationBuiltinTopicData

DDS_SubscriptionBuiltinTopicData

Variable Documentation

struct DDS_Locator_t DDS_LOCATOR_INVALID

An invalid locator.

const DDS_Long DDS_LOCATOR_KIND_INVALID

Locator of this kind is invalid.

const DDS_UnsignedLong DDS_LOCATOR_PORT_INVALID

An invalid port.

const DDS_Octet DDS_LOCATOR_ADDRESS_INVALID[DDS_LOCATOR_ADDRESS_LENGTH_MAX]

An invalid address.

const DDS_Long DDS_LOCATOR_KIND_UDPv4

A locator for a UDPv4 address.

const DDS_Long DDS_LOCATOR_KIND_SHMEM

A locator for an address acessed via shared memory.

const DDS_Long DDS_LOCATOR_KIND_UDPv6

A locator for a UDPv6 address.

const DDS_Long DDS_LOCATOR_KIND_RESERVED

Locator of this kind is reserved.