- u -

• UDPv4 : TransportBuiltinKind
• UDPv4_ALIAS : TransportBuiltinKind
• UDPV4_PAYLOAD_SIZE_MAX : UDPv4Transport
• UDPv6 : TransportBuiltinKind
• UDPv6_ALIAS : TransportBuiltinKind
• unacknowledged_sample_count : ReliableWriterCacheChangedStatus
• unacknowledged_sample_count_peak : ReliableWriterCacheChangedStatus
• uncommitted_sample_count : DataReaderProtocolStatus
• UNDEFINED : PublicationPriority
• unicast : DataWriterQos , DataReaderQos
• unicast_enabled : UDPv4Transport.Property_t , UDPv6Transport.Property_t
• unicast_locators : PublicationBuiltinTopicData , SubscriptionBuiltinTopicData
• UNICAST_ONLY_TRANSPORT_MULTICAST_QOS : TransportMulticastQosPolicyKind
• UNKEYED_READER_ENTITY_KIND : BuiltinTopicKey_t
• UNKEYED_WRITER_ENTITY_KIND : BuiltinTopicKey_t
• UNKNOWN : VendorId_t
• UNKNOWN_SAMPLE_IDENTITY : SampleIdentity_t
• UNKNOWN_SERVICE_ID : ServiceRequest
• UNREGISTERED_INSTANCE_REPLACEMENT : DataWriterResourceLimitsInstanceReplacementKind
• url_profile : ProfileQosPolicy
• use_42e_compatible_alignment : DynamicDataTypeSerializationProperty_t
• use_shared_exclusive_area : ExclusiveAreaQosPolicy
• user_data : DataReaderQos , DataWriterQos , SubscriptionBuiltinTopicData , PublicationBuiltinTopicData , ParticipantBuiltinTopicData , DomainParticipantQos
• USER_MULTICAST : RtpsReservedPortKind
• user_multicast_port_offset : RtpsWellKnownPorts_t
• USER_UNICAST : RtpsReservedPortKind
• user_unicast_port_offset : RtpsWellKnownPorts_t
• USERDATA_QOS_POLICY_ID : QosPolicyId_t
• USEROBJECT_QOS_POLICY_ID : QosPolicyId_t