udp_client

using UnityEngine;
using UnityEngine.Networking;
using System.Collections;
using System.Text;

public class NetManager : MonoBehaviour {

    [SerializeField] private string ip = "127.0.0.1";
    public int unreliableChannelId;

    private int socketId;
    private int connectionId;
    private string message = "Default text";

    void Start()
    {
        // Initializing Network Transport Layer
        NetworkTransport.Init ();

        // Getting default configuration for host topology
        ConnectionConfig CConfig = new ConnectionConfig();
        unreliableChannelId = CConfig.AddChannel(QosType.Unreliable);

        // Creating host topology
        HostTopology topology = new HostTopology(CConfig, 2);

        // Open client socket
        socketId = NetworkTransport.AddHost (topology, 52000);

        Connect ();
    }

    void OnGUI ()
    {
        message = GUI.TextField(new Rect(10, 10, 200, 20), message, 25);

        if (GUI.Button(new Rect(20, 70, 120, 20), "Send message")) {
            SendSocketMessage(message);
        }
    }

    void Update()
    {
        int recHostId; // rec - received
        int recConnectionId;
        int recChannelId;
        byte[] recBuffer = new byte[1024];
        int bufferSize = 1024;
        int dataSize;
        byte error;

        NetworkEventType recNetworkEvent = NetworkTransport.Receive(out recHostId, out recConnectionId, out recChannelId, recBuffer, bufferSize, out dataSize, out error);

        switch (recNetworkEvent)
        {
            case NetworkEventType.Nothing:
                //Debug.Log("Nothing");
            break;

            case NetworkEventType.ConnectEvent:
                Connected (recConnectionId);
            break;

            case NetworkEventType.DataEvent:
                DataReceiver(recBuffer);
                //NetworkTransport.Disconnect(socketId, connectionId, out error);
            break;

            case NetworkEventType.DisconnectEvent:
                Debug.Log("Socket closed!");
            break;
        }
    }

    public void Connect()
    {
        byte error;
        connectionId = NetworkTransport.Connect(socketId, "127.0.0.1", 3000, 0, out error);
        Debug.Log("Connected to server. ConnectionId: " + connectionId);
    }

    public void SendSocketMessage(string msg) {
        byte error;
        byte[] buffer = new byte[1024];
        Encoding enc = Encoding.ASCII;
        int length = enc.GetByteCount(msg);
        buffer = enc.GetBytes (msg);

        int bufferSize = 1024;
        NetworkTransport.Send(socketId, connectionId, unreliableChannelId, buffer, length, out error);
    }

    private void Connected(int recConnectionId)
    {
        if( recConnectionId == connectionId ) {
            Debug.Log("Connection established!");
        }
    }

    private void DataReceiver(byte[] bytes)
    {
        byte error;
        Encoding enc = Encoding.ASCII;
        string message = enc.GetString(bytes);
        Debug.Log("Message received: " + message);
    }
}