|a sequence of octets |
DDSEntity objects, so that when a remote application discovers their existence, it can access that information and use it for its own purposes. This information is not used by RTI Connext.
One possible use of this QoS is to attach security credentials or some other information that can be used by the remote application to authenticate the source.
In combination with operations such as DDSDomainParticipant::ignore_participant, DDSDomainParticipant::ignore_publication, DDSDomainParticipant::ignore_subscription, and DDSDomainParticipant::ignore_topic, this QoS policy can assist an application to define and enforce its own security policies.
The use of this QoS is not limited to security; it offers a simple, yet flexible extensibility mechanism.
Important: RTI Connext stores the data placed in this policy in pre-allocated pools. It is therefore necessary to configure RTI Connext with the maximum size of the data that will be stored in policies of this type. This size is configured with DDS_DomainParticipantResourceLimitsQosPolicy::participant_user_data_max_length, DDS_DomainParticipantResourceLimitsQosPolicy::writer_user_data_max_length, and DDS_DomainParticipantResourceLimitsQosPolicy::reader_user_data_max_length.
a sequence of octets
[default] empty (zero-length)
[range] Octet sequence of length [0,max_length]