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iDRAC9 Redfish API Guide Firmware version: 4.20.20.20

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Server-Sent Events

Server-Sent Events (SSE) are a standard that allows a client system to open an HTTP connection with a web-service that continuously pushes rapidly changing data to the client. That is, a client subscribes to a "stream" from a server and the server sends messages to the client until either the server or the client closes the stream. This is contrary to the conventional HTTP request-response paradigm whereupon receiving an HTTP request, the server processes the request and generates a response optionally closing the connection. Resource responses for SSE contains a Content-Type header set as "text/event-stream;charset=UTF-8".
NOTE Server-Sent Events are only accessible on web browsers that support Telemetry.

SSE URI for Telemetry

To start streaming all available data, use the following URI in the web browser: 
https://<iDRAC-IP>/redfish/v1/SSE?$filter=EventFormatType eq MetricReport
For streaming specific data, use the following URI in the web browser: 
https://<iDRAC-IP>/redfish/v1/SSE?$filter=EventFormatType eq '/redfish/v1/TelemetryService/MetricReportDefinitions/<Report-ID>'

In the above URI, few examples for Report-ID are; PSUMetrics, PowerStatistics, CUPS, CPUMemMetrics, ThermalSensor, NICStatistics, CPUSensor. etc.

NOTE If a connection is closed for some reason, ensure that you wait for 20 seconds to 30 seconds before restarting a new connection.

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