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