How to set up a UDP connection with a nodejs server in Unity?

Questions & Answers
1

Trying to send a buffer from a Unity C# project to a Node.js server and I can’t seem to get any data to transfer. I know this could work I think I may be missing something. See code below any help is appreciated.

Node.js “Server”

var udpPort = 9082;
var url = require ('url');
var udp = require ('dgram');
var http = require ('http');
var request = require ('request');
var udpServer = udp.createSocket ('udp4').bind (9082, '127.0.0.1');

udpServer.on ('close', function (err) {
    console.log ("UDP close");
});

udpServer.on ('error', function (err) {
    console.log ("UDP Error: " + err.toString ());
});

udpServer.on ('message', function (data, port) {
    console.log ("UDP received");
});

udpServer.on ('listening', function () {
    var address = udpServer.address ();
    console.log ("UDP Listening On IP: " + address.address + " at Port: " + address.port);
});

module.exports = function (){
    this.send = function (objectID, script, action, variables){

    }
}

Unity C# App

using UnityEngine;
using System.Text;
using System.Collections;
using System.Net.Sockets;
using System.Net;

public class Web : MonoBehaviour {

    [SerializeField]
    int UdpPort = 9082;
    [SerializeField]
    string host = "127.0.0.1";
    [SerializeField]
    UTF8Encoding encoding = new UTF8Encoding ();
    [SerializeField]
    WaitForSeconds UdpDelay = new WaitForSeconds (.3f);
    [SerializeField]
    IPEndPoint UdpEndPoint = null;
    [SerializeField]
    UdpClient client = null;

    [System.Serializable]
    public class JsonObject : System.Object {
        public string[] values;

        public JsonObject (string[] array) {
            values = array;
        }
    }

    public void UdpConnect () {
        client = new UdpClient ();
    }

    public void UdpDisconnect () {
        client.Close ();
    }

    void UdpReceive(byte[] data){
        string JsonString = encoding.GetString (data);
        JsonObject Json = JsonUtility.FromJson <JsonObject> (JsonString);
    }

    IEnumerator UdpCoro() {
        byte[] data = null;
        while (true){
            if (client.Available > 0) {
                yield return null;
                data = client.Receive (ref UdpEndPoint);
                UdpReceive (data);
                data = null;
            }
            yield return UdpDelay;
        }
    }

    public void UdpSend (params string[] values){
        JsonObject Json = new JsonObject (values);
        string Jsonstring = JsonUtility.ToJson (Json);
        byte[] data = encoding.GetBytes (Jsonstring);
        client.Send (data, data.Length, host, UdpPort);
    }

    void Start (){
        UdpConnect ();
        UdpSend ("Test");
    }

Have not gotten to the receive part yet so thats probably wrong and can be ignored.

Thanks, Sean

2

Set up the server as an IPEndPoint and had the client connect to it explicitly. Used client.send without specifying an arbitrary host destination. Works now.