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