What is the hostname for MRN using websockets API

prashanth.suresh1

I am using this hostname amer-1-t3.streaming-pricing-api.refinitiv.com

and these

mrn_domain = 'NewsTextAnalytics'

mrn_item = 'MRN_STORY'

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mrn

websockets

rrto

refinitiv-realtime-optimised

Accepted answers

wasin.w

Hello @prashanth.suresh1

Could you please let us know if you are encountering any issues when connects to amer-1-t3.streaming-pricing-api.refinitiv.com host?

I can use the cloud_mrn_notebook_app.ipynb example (download here) to connect and consume MRN data from amer-1-t3 host successfully.

You can use the following WebSocket API example to test the MRN subscription from RRTO:

Python (Jupyter):cloud_mrn_notebook_app.ipynb of https://github.com/Refinitiv-API-Samples/Example.WebSocketAPI.Python.MRN/tree/ERT-in-Cloud (Note: ERT-in-Cloud branch!)
JavaScript example: https://github.com/Refinitiv-API-Samples/Example.WebSocketAPI.Javascript.NewsMonitor
C# Example: https://github.com/Refinitiv-API-Samples/Example.WebSocketAPI.CSharp.MRNWebSocketViewer

All comments

wasin.w

Hello @prashanth.suresh1

Could you please let us know if you are encountering any issues when connects to amer-1-t3.streaming-pricing-api.refinitiv.com host?

I can use the cloud_mrn_notebook_app.ipynb example (download here) to connect and consume MRN data from amer-1-t3 host successfully.

You can use the following WebSocket API example to test the MRN subscription from RRTO:

Python (Jupyter):cloud_mrn_notebook_app.ipynb of https://github.com/Refinitiv-API-Samples/Example.WebSocketAPI.Python.MRN/tree/ERT-in-Cloud (Note: ERT-in-Cloud branch!)
JavaScript example: https://github.com/Refinitiv-API-Samples/Example.WebSocketAPI.Javascript.NewsMonitor
C# Example: https://github.com/Refinitiv-API-Samples/Example.WebSocketAPI.CSharp.MRNWebSocketViewer

denis.gomes

When I tried to run I am stuck here in this method:

private void ReceiveMessage()

{

var readBuffer = new ArraySegment<byte>(new byte[RecvBufferSize]);

MemoryStream memoryStream = null;

byte[] dataBuffer = null;

while (!Stop && !Cts.IsCancellationRequested)

{

var result = WebSocket.ReceiveAsync(readBuffer, Cts.Token);

if (!result.IsFaulted)

{

if (result.Result.EndOfMessage)

{

if (memoryStream != null)

{

memoryStream.Write(readBuffer.Array ?? throw new InvalidOperationException(),

readBuffer.Offset, readBuffer.Count);

dataBuffer = memoryStream.GetBuffer();

memoryStream.Dispose();

}

else

{

dataBuffer = readBuffer.Array;

}

break;

}

else

{

if (memoryStream == null)

memoryStream = new MemoryStream((int) RecvBufferSize * 5);

memoryStream.Write(readBuffer.Array ?? throw new InvalidOperationException(),

readBuffer.Offset, readBuffer.Count);

readBuffer = new ArraySegment<byte>(new byte[RecvBufferSize]);

}

else

{

RaiseErrorEvent(DateTime.Now, WebSocket.State,

"Unhandled Exception occured inside ReceiveMessage()");

break;

}

// Pass the data buffer back to app layer via callback.

RaiseMessageEvent(DateTime.Now, dataBuffer);

}

On the following line I am getting null exception

var result = WebSocket.ReceiveAsync(readBuffer, Cts.Token);

Exception :

System.NullReferenceException

HResult=0x80004003

Message=Object reference not set to an instance of an object.

Source=System.Net.WebSockets.Client

StackTrace:

at System.Net.WebSockets.ClientWebSocket.ReceiveAsync(ArraySegment`1 buffer, CancellationToken cancellationToken)

at WebsocketAdapter.WebsocketConnectionClient.ReceiveMessage() in \Files1\CNBC ARABIA\FeedHandler\Example.WebSocketAPI.CSharp.MRNWebSocketViewer-master\Example.WebSocketAPI.CSharp.MRNWebSocketViewer-master\WebsocketAdapter\WebsocketConnectionClient.cs:line 158

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