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