eta-api elektron elektron-sdk rrt refinitiv-realtime elektron-transport-api java c++ rssl reactor rcc-api source-directory connection trep symbology batch ssl consumer log-in api rics refinitiv-real-time fields c market-by-price linux non-interactive-provider rcc rdm Service eikon market-feed refinitiv-realtime-sdk callback token status DACS elektron-data-dictionary ADS build api-limits constituents service-id volume dispatch pricing trade refinitiv-realtime-optimised documentation quote search tick-history-rest-api load-balancing rfa compile refresh-message subscription ipa snapshot-pricing rdf sink-driven-source sequence stream-id encoding error docker service-name ADH performance multi-threading 64-bit events mrn time-stamp conflation stale chain-ric enum OMM open-source elektron-direct-feed equities message exchanges commodities fanout contributions service-dictionary failover stress-test monitoring aws data-model unsubscribe