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Reading data

Before you can read data from a stream, you need to subscribe to an event of the Streaming Reader service like ParameterData or EventData.

You can get a full list of Subscriptions and Events here .


The following code sample shows how to use the SignalR client library to:

  1. Establish a connection to Quix

  2. Subscribe to a parameter data stream

  3. Receive data from that stream

  4. Unsubscribe from the event

var signalR = require("@microsoft/signalr");

const options = {
    accessTokenFactory: () => 'YOUR_ACCESS_TOKEN'

const connection = new signalR.HubConnectionBuilder()
    .withUrl("", options)

// Establish connection
connection.start().then(() => {
    console.log("Connected to Quix.");

    // Subscribe to parameter data stream.
    connection.invoke("SubscribeToParameter", "your-topic-name", "your-stream-id", "your-parameter-id");

    // Read data from the stream.
    connection.on("ParameterDataReceived", data => {
        let model = JSON.parse(data);
        console.log("Received data from stream: " + model.streamId);

        // Unsubscribe from stream.
        connection.invoke("UnsubscribeFromParameter", "your-topic-name", "your-stream-id", "your-parameter-id");