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