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