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