@echo off
setlocal

rem Input parameters
set "ipAddress=%~1"
set "message=%~2"

rem Function to check if a computer is online
:TestComputerOnline
ping -n 1 %ipAddress% >nul 2>&1
if errorlevel 1 (
    echo %ipAddress% is not online
    exit /b 1
) else (
    exit /b 0
)

rem Check if the target IP is online
call :TestComputerOnline
if errorlevel 1 (
    echo %ipAddress% is not online
) else (
    rem Send the message
    msg * /server:%ipAddress% %message%
    echo Message sent to %ipAddress%
)

endlocal