Trouble with simple server/client

#include
#include
#include
#Region ### START Koda GUI section ### Form=
$Form1 = GUICreate("Form1", 275, 75, 192, 124)
$Button1 = GUICtrlCreateButton("Test", 32, 16, 75, 25)
$Button2 = GUICtrlCreateButton("Test2", 152, 16, 75, 25)
GUISetState(@SW_SHOW)
#EndRegion ### END Koda GUI section ###

While 1
$nMsg = GUIGetMsg()
Switch $nMsg
Case $GUI_EVENT_CLOSE
Exit
Case $Button1
RunServer("Test")
Case $Button2
RunServer("Test2")
EndSwitch
WEnd


Func RunServer($action)
TCPStartup()

Local $ConnectedSocket, $szData
Local $szIPADDRESS = @IPAddress1
Local $nPORT = 33891

; Initialize a variable to represent a connection
;==============================================
$ConnectedSocket = -1

$ConnectedSocket = TCPConnect($szIPADDRESS, $nPORT)

; If there is an error... show it
If @error Then
MsgBox(4112, "Error", "TCPConnect failed with WSA error: " & @error)
; If there is no error loop an inputbox for data
; to send to the SERVER.
Else
$szData = $action
TCPSend($ConnectedSocket, StringToBinary($action, 4))
EndIf
EndFunc ;==>Example


; and the server

#include <GUIConstantsEx.au3>


RunServer()

Func RunServer()
; Set Some reusable info
; Set your Public IP address (@IPAddress1) here.
; Local $szServerPC = @ComputerName
; Local $szIPADDRESS = TCPNameToIP($szServerPC)
Local $szIPADDRESS = @IPAddress1
Local $nPORT = 33891
Local $MainSocket, $edit, $ConnectedSocket, $szIP_Accepted
Local $msg, $recv

; Start The TCP Services
;==============================================
TCPStartup()

; Create a Listening "SOCKET".
; Using your IP Address and Port 33891.
;==============================================
$MainSocket = TCPListen($szIPADDRESS, $nPORT)

; If the Socket creation fails, exit.
If $MainSocket = -1 Then Exit


; Create a GUI for messages
;==============================================
GUICreate("My Server (IP: " & $szIPADDRESS & ")", 300, 200, 100, 100)
$edit = GUICtrlCreateEdit("", 10, 10, 280, 180)
GUISetState()


; Initialize a variable to represent a connection
;==============================================
$ConnectedSocket = -1


;Wait for and Accept a connection
;==============================================
Do
$ConnectedSocket = TCPAccept($MainSocket)
Until $ConnectedSocket <> -1


; Get IP of client connecting
$szIP_Accepted = SocketToIP($ConnectedSocket)

; GUI Message Loop
;==============================================
While 1
$msg = GUIGetMsg()

; GUI Closed
;--------------------
If $msg = $GUI_EVENT_CLOSE Then ExitLoop

; Try to receive (up to) 2048 bytes
;----------------------------------------------------------------
$recv = TCPRecv($ConnectedSocket, 2048)

; If the receive failed with @error then the socket has disconnected
;----------------------------------------------------------------
If @error Then ExitLoop

; convert from UTF-8 to AutoIt native UTF-16
$recv = BinaryToString($recv, 4)

; Update the edit control with what we have received
;----------------------------------------------------------------
If $recv <> "" Then GUICtrlSetData($edit, _
$szIP_Accepted & " > " & $recv & @CRLF & GUICtrlRead($edit))
WEnd


If $ConnectedSocket <> -1 Then TCPCloseSocket($ConnectedSocket)

TCPShutdown()
EndFunc ;==>Example

; Function to return IP Address from a connected socket.
;----------------------------------------------------------------------
Func SocketToIP($SHOCKET)
Local $sockaddr, $aRet

$sockaddr = DllStructCreate("short;ushort;uint;char[8]")

$aRet = DllCall("Ws2_32.dll", "int", "getpeername", "int", $SHOCKET, _
"ptr", DllStructGetPtr($sockaddr), "int*", DllStructGetSize($sockaddr))
If Not @error And $aRet[0] = 0 Then
$aRet = DllCall("Ws2_32.dll", "str", "inet_ntoa", "int", DllStructGetData($sockaddr, 3))
If Not @error Then $aRet = $aRet[0]
Else
$aRet = 0
EndIf

$sockaddr = 0

Return $aRet
EndFunc ;==>SocketToIP