package.json

{
  "name": "utp-hole-punching",
  "dependencies": {
    "utp-native": "*",
    "discovery-channel": "*"
  }
}

punch.js

var utp = require('utp-native')
var dc = require('discovery-channel')

var SERVER = ['discovery.publicbits.org:5300', 'discovery.publicbits.org']
var message = process.argv[2] || 'hello world'

var socket = utp()

socket.on('connection', onconnection)

socket.on('listening', function () {
  var discovery = dc({
    dns: {
      server: SERVER,
      socket: socket
    },
    dht: {
      socket: socket
    }
  })

  discovery.on('peer', function (id, peer) {
    if (peer.port === socket.address().port) return
    var connection = socket.connect(peer.port, peer.host)
    onconnection(connection)
  })

  discovery.add('hello-world-test', 0)
})

socket.listen()

function onconnection (conn) {
  conn.setTimeout(60 * 1000, conn.destroy)
  conn.write(message)
  conn.on('error', function () {})
  conn.on('data', function (data) {
    console.log(data.toString())
  })
}