@echo off

:SELECTOR
set sel=0
echo Podaj tryb:
echo [1] Server
echo [2] Client
set /p sel=

if %sel% equ 1 (
	echo Teraz nasłuchuje serwer:
	nc localhost -l -p 1234
) else (
	if %sel% equ 2 (
		echo Klient gotowy:
		nc localhost 1234
	) else (
		if %sel% gtr 2 (
			goto SELECTOR
		)
	)
)