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