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