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