websocket websocket webinar webinar websocket api elektron websockets api elektron api edp ert in cloud python websocket api market data sample request authentication trep api ert cloud ewa connection websockets python api cloud posting connectivity websocket java refresh ADS login error batch snapshot conflation license ert Service state streaming historical refinitiv marketbyorder trep elektron fields realtime webscoket c# elektron websocket api disconnect documentation node.js aws batchrequest samples qos condition codes record creation and updating. ews port period trkd streaming descriptions token json contribution access denied client_id simplified stream partial currency pair level 2 login elektron_dd chain ric c failover tick quote_date key electron api synchronous rfa java production url ezd real-time-data limitation approval c# .net api market status analytics currency conversion rates trep api symbology view ric multiple streamstate keys authentication token tsa performance field definition delayed mitch websock exception websocket ios composite exchange codes ask erp websocket android fx close market phyton sso test access rmtes .net 502 market data caching error code 400 address datafields dds_trce failure OMM unable identifiers domain post authhostname tenors deniedbysrc dds marketprice testing eikon error message currency websocket-api holida wss auth_url csharp c# .net web api ric api call date status elektron connect time and sales electron fx rate ws quotim_ms eap api-key news analytics elecktron api reuters api override client historical data access news socket symbol subscriptions MarketFeed suspect api requests redundancy connection closed unix posting websockets timeout trkd mrn sink_driven_src webscoket api bid #python economic indicators ric tradesafe composite web sockets json bad gateway error 400 credentials data trkd websockets java streaming websockets post