0Alarm Clock LogoPHP / JavaScript to wake a PC remotely

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I have an HTPC and a net­work serv­er on my net­work.  My serv­er is always on, but the HTPC sleeps when it is not in use.  If I want to sched­ule record­ings remotely I need a way to wake the HTPC.  The solu­tion I came up with is to provide a webpage on my serv­er (pass­word pro­tec­ted) that wakes the HTPC and then redir­ects to the web inter­face of the remote con­trol app of the HTPC.  Below is the code for any­one interested…

[php language=“htmlscript”]<html>
<head>
<meta http-equiv=‘refresh’ content=’11;url=address of htpc here’ />
<script type=“text/javascript”>
// time is the num­ber of seconds left
// name is the text part of the con­tain­er to insert count­down in
// num is the unique id of the con­tain­er. Allows for more than 1 per page
func­tion countdown(time, name, num)
{
// grab the ele­ment object of the count­down container
count­down­Div = document.getElementById(name + num);
// cal­cu­late num­ber of minutes from the seconds
minutes = Math.floor(time / 60);
// remainder is num­ber of seconds
seconds = time % 60;
// add the cur­rent count­down dis­play to the con­tain­er specified
countdownDiv.innerHTML = ‘after ’ + seconds + ’ seconds, please wait’;
if(time == 1)countdownDiv.innerHTML = ‘after ’ + seconds + ’ second, please wait’;
// if time is up remove the edit div, oth­er­wise repeat every second
if(time <= 0) countdownDiv.innerHTML = ‘now…’;
else setTimeout(‘countdown(‘ + –time + ‘,“ ‘ + name + ’ ”,“ ‘ + num + ‘”);’, 1000);
}
</script>
</head>
<body bgcolor=‘#000022’ style=‘text-align: cen­ter; col­or: white; pad­ding-top: 30px;’>
<h2>
The TV inter­face will auto­mat­ic­ally load <div id=“div_name1” style=“display:inline;”></div>
<script type=“text/javascript”>countdown(12, “div_name”, 1)</script>
</h2>
<?php
flush();
$addr_byte = explode(‘:’, “MAC Address of htpc here”);
$hw_addr = ”;
for ($a=0; $a <6; $a++) $hw_addr .= chr(hexdec($addr_byte[$a]));
$msg = chr(255).chr(255).chr(255).chr(255).chr(255).chr(255);
for ($a = 1; $a <= 16; $a++) $msg .= $hw_addr;
$s = socket_create(AF_INET, SOCK_DGRAM, SOL_UDP);
$opt_ret = socket_set_option($s, 1, 6, TRUE);
if(socket_sendto($s, $msg, strlen($msg), 0, “loc­al sub­net address here”, “7”)) {socket_close($s);return TRUE;}else {return FALSE;}
?>
</body>
</html>[/php]

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