RTI Connext DDS Micro C API  Version 3.0.2
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The DDS_DomainParticipantResourceLimitsQosPolicy::remote_participant_allocation resource-limit limits the maximum number of DDS_DomainParticipant's that can be discovered by a local DDS_DomainParticipant.
The DPDE discovery plugin is a first discovered first served basis and the only way to limit discovery is careful use of peer addresses.
The DPSE discovery plugin limits the discovery to those that have been asserted based on the DomainParticipant name using DPSE_RemoteParticipant_assert

RTI Connext DDS Micro C API Version 3.0.2 Copyright © Thu Dec 12 2019 Real-Time Innovations, Inc