udp-forwarder.js

const CONFIG = {
    sendPort: 8181,
    receivePort: 1234
}

var dgram = require('dgram')

var sendSocket = dgram.createSocket('udp4')
var receiveSocket = dgram.createSocket('udp4')

receiveSocket.on('message', d => {
    sendSocket.send(d, CONFIG.sendPort, '127.0.0.1', err => {
        if (err) {
            console.log("Something went wrong while forwarding a packet.")
        }
        else {
            console.log(`Successfully forwarded a packet to local port ${CONFIG.sendPort}`)
        }
    })
})

receiveSocket.on('error', () => {
    console.log("Something went wrong :( You may need to change the receivePort in the config.")
})

receiveSocket.bind(CONFIG.receivePort)