elektron-sdk rrt elektron eta-api elektron-transport-api java rssl trep encoding pricing refinitiv-realtime error stream-id interactive-provider DACS upa-api fields map-entry json-payload multi-threading upa buffer debugging performance caching rdm elektron-data-dictionary trade non-interactive-provider stream-state error-1006 ATS OMM bonds data service-status document refinitiv-real-time enum market-by-price channel api consumer symbology reactor onepass source-directory error-handling rfa development connection re-subscribe latency api-limits