TCP/IP Stream.Read doesnt work

I have small tcp C# server and client. First of all, i cant understand why unity send only one message to server with coordinates. Client code:

 using System;
 using System.Threading;
 using System.Net;
 using System.Net.Sockets;
 using System.Text;
 using System.IO;
 using UnityEngine;
 using System.Collections;
 
 public class TCPClient : MonoBehaviour
 {
     UnicodeEncoding encod = new UnicodeEncoding();
     NetworkStream stm;
     byte[] pos;
     TcpClient tcp;
     byte[] kek;
 
     // Use this for initialization
     void Start() {
         Connect();
     }
     void Connect()
     {
         try{
         tcp = new TcpClient("127.0.0.1",445);
         tcp.Connect("127.0.0.1",445);
         }
         catch{
             Connect ();
         }
     }
 
 
     // Update is called once per frame
     void Update()
     {
         stm = tcp.GetStream ();
         pos = encod.GetBytes(Convert.ToString(transform.position.x) + " " + Convert.ToString(transform.position.y) + " " + Convert.ToString(transform.position.z));
         stm.Write(pos,0,pos.Length);
        //stm.Read(kek,0,kek.Lenght);
         print(System.Text.Encoding.Unicode.ToString(kek));
 
     }
 
 }
 

Also, when i'm trying to Read answer form server using Stream.Read, unity freezing and doesnt work until i turn off server. Server code:

 using System;
 using System.Collections.Generic;
 using System.Text;
 using System.Net.Sockets;
 using System.Net;
 using System.Threading;
 
 namespace Server
 {
     class Program
     {
         UnicodeEncoding encod = new UnicodeEncoding();
         TcpListener Listener = new TcpListener(IPAddress.Any, 445);
         TcpClient client;
        
         void StartAndAccept() {
             while (true) {
                 Listener.Start();
                 Listener.AcceptTcpClient();
                 client = Listener.AcceptTcpClient();
                 Stream(client);
                 Thread.Sleep(0);
             }
 
         }
 
         static void Main(string[] args)
         {
             Program t = new Program();
             t.StartAndAccept();
 
         }
         public static void Stream(object client)
         {
             Program t = new Program();
             TcpClient client2 = (TcpClient)client;
             byte[] res = new byte[64];
             NetworkStream stream = client2.GetStream();
             stream.Read(res,0,res.Length);
             Console.WriteLine(System.Text.Encoding.Unicode.GetString(res));
             byte[] z = new byte[16]
             //stream.Write(z,0,z.Length);
             
       
 
             Thread.Sleep(0);
           
         }
     }
 }
 

Sorry for my bad English

I'll be grateful for the help