const dgram = require('dgram');
const client = dgram.createSocket('udp4');

client.on('close', () => {
  console.log('close');
});

client.on('error', () => {
  console.log('error');
});

client.on('message', (msg, rinfo) => {
  console.log(`接收到来自：${rinfo.address}:${rinfo.port} 的消息： ${msg}`);
});

client.send('hello', 17601, '108.137.177.19');