Socket.cs

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

public class SocketConnection : MonoBehaviour {

    private Socket _clientSocket = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);
    private byte[] _recieveBuffer = new byte[8142];

    void Start()
    {
        Debug.Log("onStart");
        SetupServer();
    }

    private void SetupServer()
    {
        Debug.Log("SetupServer");
        try
        {
            _clientSocket.Connect(new IPEndPoint(System.Net.IPAddress.Parse("127.0.0.1")/*IPAddress.Loopback*/, 3000));
        }
        catch (SocketException ex)
        {
            Debug.Log(ex.Message);
        }
        
        /*
        Debug.Log("-- 1");
        Debug.Log("socket connect? -> " + _clientSocket.Connected);
        Debug.Log("-- 2");
        SendData(System.Text.Encoding.UTF8.GetBytes("Campi"));
        Debug.Log("-- 3");
        */
        //SendData(Encoding.ASCII.GetBytes("connection"));
        _clientSocket.BeginReceive(_recieveBuffer, 0, _recieveBuffer.Length, SocketFlags.None, new AsyncCallback(ReceiveCallback), null);
    }

    private void ReceiveCallback(IAsyncResult AR)
    {
        Debug.Log("ReceiveCallback");
        //Check how much bytes are recieved and call EndRecieve to finalize handshake
        int recieved = _clientSocket.EndReceive(AR);
        Debug.Log("ReceiveCallback 1 recieved: " + recieved);
        if (recieved <= 0)
            return;
        
        //Copy the recieved data into new buffer , to avoid null bytes
        byte[] recData = new byte[recieved];
        Buffer.BlockCopy(_recieveBuffer, 0, recData, 0, recieved);

        Debug.Log("ReceiveCallback 2: " + recData.Length+" - "+recData.ToString());
        Debug.Log("ReceiveCallback 3: " + Encoding.ASCII.GetString(recData)+" : ");
        Debug.Log("ReceiveCallback 4");
        //Process data here the way you want , all your bytes will be stored in recData

        //Start receiving again
        _clientSocket.BeginReceive(_recieveBuffer, 0, _recieveBuffer.Length, SocketFlags.None, new AsyncCallback(ReceiveCallback), null);
        Debug.Log("ReceiveCallback 5");
    }

    private void SendData(byte[] data)
    {
        SocketAsyncEventArgs socketAsyncData = new SocketAsyncEventArgs();
        socketAsyncData.SetBuffer(data, 0, data.Length);
        _clientSocket.SendAsync(socketAsyncData);
    }
}