trep infrastructure elektron refinitiv-realtime ADH ADS rfa rmds-test-client ATS non-interactive-provider rics sink-driven-source DACS OMM elektron-sdk rest-api caching open-dacs data sfc authentication disconnection eikon rcc-api latency fields update-message elektron-data-dictionary issue mifid ssl java request private-streams posting rrcp xml contributions pricing c# publishing websockets oracle rfa-api page mrn screening enum compression api app parameters connection-error sdk rcc source-directory reports packet-loss rkd-api rssl r ema-api mount multicast soap-api web-services ping rrcp-dump status delayed-feed market-feed watchlist openssl chain-ric error etf batch symbology