Here is a list of all documented variables with links to the struct/union documentation for each field:

- u -

• unacknowledged_count : DDS_ReliableSampleUnacknowledgedStatus
• unbind : ZCOPY_NotifUserInterfaceI
• unicast_locator : DDS_PublicationBuiltinTopicData, DDS_SubscriptionBuiltinTopicData
• user_data : DDS_DataReaderQos, DDS_DataWriterQos, DDS_DomainParticipantQos, DDS_ParticipantBuiltinTopicData, DDS_PublicationBuiltinTopicData, DDS_SubscriptionBuiltinTopicData, UDP_TransformRule
• user_intf : ZCOPY_NotifInterfaceFactoryProperty
• user_multicast_port_offset : DDS_RtpsWellKnownPorts_t
• user_property : ZCOPY_NotifInterfaceFactoryProperty
• user_ptr : PSK_ErrListener
• user_traffic : DDS_DomainParticipantQos
• user_unicast_port_offset : DDS_RtpsWellKnownPorts_t