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