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