text: const PORT = 33333;
  const HOST = '127.0.0.1';
  
  const dgram = require('dgram');
  const message = Buffer.from('My KungFu is Good');
  
  let client = dgram.createSocket('udp4');
  client.on('message', (msg, rinfo)=> {
    console.log('recv %s(%d) from server\n', msg, msg.length);
  });
  
  client.bind(5060, '127.0.0.1')
  
  setInterval(() => {
    client.send(message, PORT, HOST, (err, bytes)=> {
      if (err)  throw err;
      console.log('UDP message sent to ', HOST, ':', PORT);
      // client.close();
    })
  }, 3000);
  