Help. TCP to Zoom Player

[shEiD]

I'm new to TCP. I've tried it with AutoIt's inbuilt functions (2 scripts: server/client) and it worked. Only when I try to send commands to Zoom Player, it does not work. Am I doing something wrong, or simply missing something, being total TCP newb?

The code I'm trying:

$msg = "5100 fnPlay" & @CRLF
$ip = "127.0.0.1"

$startup = TCPStartup()
$socket = TCPConnect($ip, 4769)
$send = TCPSend($socket, $msg)
$closesocket = TCPCloseSocket($socket)
$shutdown = TCPShutdown()

ConsoleWrite('@@ Debug(' & @ScriptLineNumber & ') : $msg = ' & $msg & @CRLF) ;### Debug Console
ConsoleWrite('@@ Debug(' & @ScriptLineNumber & ') : TCPStartup() = ' & $startup & @CRLF) ;### Debug Console
ConsoleWrite('@@ Debug(' & @ScriptLineNumber & ') : TCPConnect() = ' & $socket & @CRLF) ;### Debug Console
ConsoleWrite('@@ Debug(' & @ScriptLineNumber & ') : TCPSend() = ' & $send & @CRLF) ;### Debug Console
ConsoleWrite('@@ Debug(' & @ScriptLineNumber & ') : TCPCloseSocket() = ' & $closesocket & @CRLF) ;### Debug Console
ConsoleWrite('@@ Debug(' & @ScriptLineNumber & ') : TCPShutdown() = ' & $shutdown & @CRLF) ;### Debug Console

I've tried @IPAddress1 and "127.0.0.1", nothing works properly. Sometimes I get some weird error from zoomplayer: "List index out of bounds (0)", but mostly - nothing. And I mean I'm getting nothing or error, when running the exact same code (the same, as in the example). Shouldn't I get error all the time? I'm really confused...

Here is info about zoom player's TCP: link

Thanks in advance for any help.

PS, heres what I get in the console:

@@ Debug(42) : $msg = 5100 fnPlay

@@ Debug(43) : TCPStartup() = True
@@ Debug(44) : TCPConnect() = 412
@@ Debug(45) : TCPSend() = 13
@@ Debug(46) : TCPCloseSocket() = True
@@ Debug(47) : TCPShutdown() = True

It looks, like connection and sending were successful. Me understands nothing