samsung_send_key.js

const WebSocket = require('ws');

const tvIP = '192.168.3.6';
const ws = new WebSocket(`wss://${tvIP}:8002/api/v2/channels/samsung.remote.control`,  { rejectUnauthorized: false });

ws.onopen = () => console.log('opened.');
ws.onclose = () => console.log('closed.');
ws.onmessage = message => {
  const data = JSON.parse(message.data);

  if (data.event === 'ms.channel.connect') {
    ws.send(JSON.stringify({
      method: 'ms.remote.control',
      params: {
        TypeOfRemote: 'SendRemoteKey',
        Cmd: 'Click',
        Option: 'false',
        DataOfCmd: 'KEY_MUTE',
      }
    }));

    setTimeout(() => ws.close(), 1000);
  }
};