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