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