const WebSocket = require('ws'); // Assuming you've installed ws with npm install ws  class YourClassName {   constructor(clientId, accessToken) {     this.clientId = clientId;     this.accessToken = accessToken;     this.ws = new WebSocket('ws://your_websocket_url'); // Replace with your WebSocket URL     this.isAuthorized = false;   }    padWithZeros(buffer, length) {     const padding = Buffer.alloc(length - buffer.length, 0);     return Buffer.concat([buffer, padding], length);   }    async sendAuthorizationPacket() {     let apiAccessToken = Buffer.from(this.accessToken, 'utf-8');     apiAccessToken = this.padWithZeros(apiAccessToken, 500);     const authenticationType = Buffer.from("2P", 'utf-8');     const payload = Buffer.concat([apiAccessToken, authenticationType]);      const feedRequestCode = 11;     const messageLength = 83 + apiAccessToken.length + authenticationType.length;     let clientId = Buffer.from(this.clientId, 'utf-8');     clientId = this.padWithZeros(clientId, 30);     const dhanAuth = Buffer.alloc(50, 0);     const header = Buffer.alloc(83); // Adjust the size based on your actual header structure     header.writeInt8(feedRequestCode, 0);     header.writeUInt16LE(messageLength, 1);     clientId.copy(header, 3);     dhanAuth.copy(header, 33);      const authorizationPacket = Buffer.concat([header, payload]);      // Send authorization packet     this.ws.on('open', () => {       this.ws.send(authorizationPacket);       this.isAuthorized = true;       console.log('Authorization packet sent');     });      // Handle messages from the server     this.ws.on('message', function incoming(data) {       console.log('Received:', data);     });      // Handle any errors     this.ws.on('error', function error(error) {       console.error('WebSocket error:', error);     });   } }  // Usage const instance = new YourClassName('yourClientId', 'yourAccessToken'); instance.sendAuthorizationPacket();