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