Cannot connect more than one websocket connection

[Jeet Pattani]

On the docs it says that a client ID can have 3 concurrent websocket connection. But I get an Error everytime I try to connect to for 2nd websocket connection.

Screenshot from Docs

Using the below code I try to connect to the websocket. Please do tell if I can have more than one connections because before a few weeks the same code worked to have more than one connection.

const express = require('express');
const WebSocket = require('ws');
require("dotenv").config();
const app = express();
const port = 3001;

// WebSocket URL
const url = 'ws://smartapisocket.angelone.in/smart-stream';

// Authentication headers
const headers = {
  'Authorization': 'Bearer '+process.env.jwtToken,
  'x-api-key': 'Q906QkvT',
  'x-client-code': 'P529774',
  'x-feed-token': process.env.feedToken
};


// Create a WebSocket instance
const socket = new WebSocket(url, { headers });

// Map to store tokenID to tokenName mapping
const tokenMapping = {
    '99926037':'NIFTY FINANCIAL SERVICES',
};

const tokenIDArray = Object.keys(tokenMapping);

// Store the received data in an array
//let receivedData = [];

// Handle WebSocket connection open
socket.on('open', () => {
  //console.log('WebSocket connected');

   // Send a subscription request
   const subscriptionRequest = {
    //correlationID: '',
    action: 1,
    params: {
      mode: 2,
      tokenList: [
        {
          exchangeType: 1,
          tokens: ['99926037'],
        },
      ],
    },
  };

  socket.send(JSON.stringify(subscriptionRequest));
});

// Store the latest data for each instrument
const latestData = {};

// Handle received messages from the WebSocket
socket.on('message', (message) => {
  const data = new Uint8Array(message);

  // Check if the message is a heartbeat response
  if (data.length === 4 && data[0] === 112 && data[1] === 111 && data[2] === 110 && data[3] === 103) {
    // Ignore heartbeat response
    return;
  }

  // Parse the received binary data based on the provided response contract

  // Extract the Last Traded Price (LTP) and Token ID from the received data
  const ltpBytes = data.slice(43, 47);
  const closePriceBytes = data.slice(115, 122);
  const tokenIDBytes = data.slice(2, 27);
  const ltpValue = ltpBytes.reduce((value, byte, index) => value + byte * Math.pow(256, index), 0);
  const closePrice = closePriceBytes.reduce((value, byte, index) => value + byte * Math.pow(256, index), 0);
  const ltp = ltpValue / 100;
  const yesterdayPrice = closePrice / 100;
  const priceChange = parseFloat((ltp-yesterdayPrice).toFixed(2));
  const percentChange = parseFloat(((priceChange/ltp)*100).toFixed(2));

//  const decoder = new TextDecoder('utf-8');
  const tokenID = new TextDecoder().decode(tokenIDBytes).replace(/\u0000/g, '');//To decode from Bytes and remove the null characters at the end of tokenID
  const tokenName = tokenMapping[tokenID];

  // Create a JSON object with tokenID and ltp
  const jsonData = {
    tokenName: tokenName,
    ltp: ltp,
    yesterdayPrice:yesterdayPrice,
    change:priceChange,
    percentChange:percentChange,
  };

  // Store the latest data for the instrument
  latestData[tokenID] = jsonData;
  //console.log(latestData)
  // Display the JSON object
  console.log(jsonData);
});

// Handle WebSocket connection close
socket.on('close', () => {
  console.log('WebSocket connection closed');
});

// Send heartbeat message every 30 seconds to keep the connection alive
setInterval(() => {
  if (socket.readyState === WebSocket.OPEN) {
    socket.send('ping');
  }
}, 29000);

// Enable CORS
app.use((req, res, next) => {
  res.header('Access-Control-Allow-Origin', '*');
  res.header('Access-Control-Allow-Headers', 'Origin, X-Requested-With, Content-Type, Accept');
  next();
});

// a GET endpoint to retrieve the latest data for all instruments
app.get('/api/prices', (req, res) => {
    res.json(latestData);
  });
// a GET endpoint to retrieve the latest tokenMapping for the instruments
  app.get('/api/mappings', (req, res) => {
    res.json(tokenMapping);
  });
// Start the Express server
app.listen(port, () => {
  console.log(`Server listening on port ${port}`);
});

[admin]

Thanks @Jeet-Pattani for the update.

[Jeet Pattani]

@admin I got Error 429 while trying to create a 2nd connection. But it was resolved after I emailed this issue on smartapi@angelbroking.com.

[admin]

Hi @Jeet-Pattani Thank you for reaching out to us with the error you encountered while running the WebSocket. From the provided code snippet, it seems that you are using Node.js to create a WebSocket connection. However, without the specific details of the error you encountered, it's challenging to pinpoint the exact cause. To assist you better, could you please provide us with the specific error message or any related logs you received?