DESCRIPTION: The DPDE builtin participant topic datawriter allocates max_participant_locators to send participant announcements to. The default value DDS_LENGTH_AUTO calculates max_participant_locators as remote_participant_allocation + (DPDE_MAX_ANON_PARTICIPANT * (peer_length + 1)) where the constant DPDE_MAX_ANON_PARTICIPANT = 6.

: A participant locator is defined as a unique index@address to send to where index is an integer >= 0 and only applies to unicast addresses. For multicast address the index is 0.This index is the highest participant_id that will receive participant announcements at the address.

: The maximum number of addresses to send to is defined by the peer list (either specified in DDS_DiscoveryQosPolicy::initial_peers or by calling DDS_DomainParticipant_add_peer. The maximum number of addresses needed is determined by adding all indices for all unicast addresses and adding one for each multicast address.