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