config_builder_lightpad_config.php

<?PHP
/********************************************************************************************
Credit Where Credit Is Due

This php code and documentation is based HEAVILY off of the awesome work done by mikenmat
and would not have been possible otherwise. (Ok, maybe but with a lot of pain and suffering)

This guy is probably also the reason the PIR events were added to the lightpad output stream
by the developers, which is what I wanted most. Thanks!!

mikenemat/plum-probe
https://github.com/mikenemat/plum-probe
********************************************************************************************/
error_reporting(E_ALL);
ini_set('error_reporting', E_ALL);
require_once('./config.php');



if(!($sock = socket_create(AF_INET, SOCK_DGRAM, SOL_UDP)))//Create UDP IPV4 socket.
{
	$error_code = socket_last_error();//Capture errors if any.
	$error_message = socket_strerror($error_code);//Convert error to string for output.
	
	die("Couldn't create socket: [$error_code] $error_message \n");//Exit, error creating socket.
}
 
echo "UDP listening socket created. \n";

if(!socket_bind($sock, $server_adapter_ip, $lightpad_udp_heartbeat_port))// Bind socket to all adapters, port.
{
	$error_code = socket_last_error();//Capture errors if any.
	$error_message = socket_strerror($error_code);//Convert error to string for output.
	
	die("Could not bind socket : [$error_code] $error_message \n");//Unable to bind socket, might be in use by another process.
}

echo "UDP listenting socket bound to ".$server_adapter_ip." / ".$lightpad_udp_heartbeat_port.". \n";

socket_set_option($sock, SOL_SOCKET, SO_REUSEADDR, 1);//The SO_REUSEADDR socket option allows a socket to forcibly bind to a port in use by another socket.
socket_set_option($sock, SOL_SOCKET, SO_BROADCAST, 1);//Socket semantics require that an application set the SO_BROADCAST option on before attempting to send a datagram to a base or broadcast address. This protects the application from accidentally sending a datagram to many systems.
socket_set_option($sock, SOL_SOCKET, SO_RCVTIMEO, array("sec"=>360,"usec"=>0));//Set a 6 minute timeout to avoid a complete hang if there is not lightpad traffic.

//socket_sendto($sock, "PLUM", strlen("PLUM"), 0, '255.255.255.255', 43770);

//Example Message: PLUM 8888 12345678-90ab-cdef-1234-567890abcdef 8443

$lightpads = array();

echo "\n\nThis script will run until ".$wait_for_this_many_lightpads_to_be_found." lightpads are found, edit config to find more or less.\n";
echo "Typically lightpads send out a UDP heartbeat with their information once every 5 minutes.\nPlease wait at least that long before giving up.\n";
echo "If you don't detect any lightpads ensure you are on the same wireless network and have good wireless connectivity to all switches.\n\n";


while(sizeof($lightpads) < $wait_for_this_many_lightpads_to_be_found)//Run forever.
{
    echo "Waiting for data ... \n";
    
    $r = socket_recvfrom($sock, $buffer, $buffer_length, 0, $remote_ip, $remote_port);//Wait for data.
    $lightpad_data = explode(" ", $buffer);//Split the result into an array, should have 4 parts, PLUM, 8888, <lightpad_id>, <destination_port>
	if(sizeof($lightpad_data) === 4)//If the message splits into exactly 4 parts, not the best way to confirm a plum packet.
	{
		$lightpad = array(
			'port' => (int)$lightpad_data[3],
			'ip' => $remote_ip,
			'lastUpdate' => time()
		);//Set a new lightpad variable with the port, ip and a unix timestamp of when we received the data.
		
		if(isset($lightpads[$lightpad_data[2]]))//If we already found this lightpad before and have it stored in $lightpads[] array.
		{
			$lightpads[$lightpad_data[2]] = $lightpad;//Update the data in $lightpads, just in case the IP changed and to refresh the timestamp.
			echo "Updated Lightpad: ".$lightpad_data[2]." - ".$lightpad['ip']."\n";
		}
		else//If we havn't found this lightpad before.
		{
			$lightpads[$lightpad_data[2]] = $lightpad;//Add it to the $lightpad[] array.
			echo "Added Lightpad: ".$lightpad_data[2]." - ".$lightpad['ip']."\n";
		}
		
		$line_length = 82;//Used to add the ----- in the output.
		echo str_repeat("-", $line_length)."\n";//Echo a long line of -----.
		echo "Total Lightpads: ".sizeof($lightpads).", Looking For: ".($wait_for_this_many_lightpads_to_be_found - sizeof($lightpads))." More\n";//Output how many lightpads we have found.
		echo str_repeat("-", $line_length)."\n";//Echo a long line of -----.
		
		foreach($lightpads as $key => $value)//Scroll through every lightpad we've already found.
		{
			echo "IP: ".$value['ip'].", ID: ".$key.", Updated: ".$value['lastUpdate']."\n";//Echo out the IP, ID and last updated timestamp.
		}
		echo str_repeat("-", $line_length)."\n\n";//Echo a long line of -----.
		
		file_put_contents($lightpad_config_file, json_encode($lightpads, JSON_PRETTY_PRINT));//Write out the $lightpadsp[] array to the config file in JSON format, with pretty (easy to read) formatting.
	}
}

if(sizeof($lightpads) == $wait_for_this_many_lightpads_to_be_found)//Check and see if we found all the lightpads we were looking for.
{
	echo "\n\nAll lightpads found!\n\n";
}
else
{
	echo "\n\nScript timed out due to lack of lightpad data, check network connectivity and try again.\n\n";
}

socket_close($sock);//All done, close the socket.
?>