Simple UDP broadcaster and listener in Node.js

broadcaster.js

import { createSocket } from 'dgram'

const PORT = process.env.UDP_LISTENER_PORT || 41234
const socket = createSocket('udp4')

const message = Buffer.from('MST_TV_SERVER')

socket.bind(() => {
  socket.setBroadcast(true)

  const broadcastInterval = setInterval(() => {
    socket.send(message, 0, message.length, PORT, '255.255.255.255', (err) => {
      if (err) {
        console.error('Broadcast error:', err)
        socket.close()
        clearInterval(broadcastInterval)
      }
    })
  }, 1000 * 5)
})

listener.js

import { createSocket } from 'dgram'

const PORT = process.env.UDP_LISTENER_PORT || 41234
const server = createSocket('udp4')

server.on('error', (err) => {
  console.error('Listening error:', err)
  server.close()
})

server.on('message', (msg, remoteInfo) => {
  console.log(`Message: ${msg} from ${remoteInfo.address}:${remoteInfo.port}`)
})

server.on('listening', () => {
  const serverAddress = server.address()

  console.log(`Listening at ${serverAddress.address}:${serverAddress.port}`)
})

server.bind(PORT)

package.json

{
  "name": "udp",
  "version": "1.0.0",
  "description": "Simple UDP broadcaster and listener in Node.js",
  "main": "listener.js",
  "type": "module",
  "scripts": {
    "test": "echo \"Error: no test specified\" && exit 1"
  },
  "keywords": [],
  "author": "",
  "license": "ISC"
}