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

broadcastServer.on('message', (msg, rinfo) => {
  console.log(`server got: ${msg} from ${rinfo.address}:${rinfo.port}`);
  broadcastServer.send(hostAddr, 0 , hostAddr.length, 35124, rinfo.address);
  console.log(`server broadcast ${hostAddr} to ${rinfo.address}`);
});

broadcastServer.bind(broadcastPort, function(){
  broadcastServer.setBroadcast(true);
});