Format of TCPOpen request packet:
Offset	Size	Description	)
 00h  8 BYTEs	???
 08h	WORD	function number (0000h-001Ah or FFF9h-FFFFh)
 0Ah	WORD	???
 0Ch  2 BYTEs	???
 0Eh	WORD	(ret) return code
 10h  2 BYTEs	???
 12h	WORD	???
 14h	WORD	(ret) 0001h if requested function complete
 16h	WORD	(ret) ???
 18h  6 BYTEs	???
 1Eh	DWORD	-> ???
 22h	WORD	??? or 0000h
 24h	WORD	(ret) ???
SeeAlso: #03318