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