[Edited for better explanation and code included]
Hi! I have a php script on my web server that logs in to my heat pump web interface nibeuplink.com and gets all my temperature readings and so forth and returns them in a json-format.
freeboard.io is a free service for visualizing data, so I'm making a freeboard.io for my heat pump values. in freeboard.io I can add any json data as a data source, so I have added the link to my php-script. It fetches the data once but it seems there is some kind of cached values that it uses after that so they are not updated with new values from the script. freeboard.io uses a get-function to get the url. If i use a normal web browser to run the php script and refresh it, the values are updated - and also immediately updated in freeboard.io. Freeboard.io has a setting to automatically update the data source every 5 seconds.
It seems that there is something that triggers the script correctly when it is fetched from my web browser, but not when it is fetched from freeboard.io that uses a get function every 5 seconds to get new data.
in freeboard I can add headers to the get request, is there some header that would help me here to discard any cached data?
I hope that explains my problem better.
Is there anything i can add to my code in the beginning to always force an override of any cached data?
<?php
/*
* read nibe heatpump values from nibeuplink status web page and return them in json format.
* based on: https://www.symcon.de/forum/threads/25663-Heizung-Nibe-F750-Nibe-Uplink-auslesen-auswerten
* to get the code which is required as parameter, log into nibe uplink, open status page of your heatpump, and check url:
* https://www.nibeuplink.com/System/<code>/Status/Overview
*
* usage: nibe.php?email=<email>&password=<password>&code=<code>
*/
// to add additional debug output to the resulting page:
$debug = false;
date_default_timezone_set('Europe/Helsinki');
$date = time();
// Create temp file to store cookies
$ckfile = tempnam ("/tmp", "CURLCOOKIE");
// URL to login page
$url = "https://www.nibeuplink.com/LogIn";
// Get Login page and its cookies and save cookies in the temp file
$ch = curl_init();
curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, false); // Accepts all CAs
curl_setopt($ch, CURLOPT_URL, $url);
curl_setopt($ch, CURLOPT_COOKIEJAR, $ckfile); // Stores cookies in the temp file
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
$output = curl_exec($ch);
// Now you have the cookie, you can POST login values
$ch = curl_init();
curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, 0);
curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, 0);
curl_setopt($ch, CURLOPT_URL, $url);
curl_setopt($ch, CURLOPT_POST, 2);
curl_setopt($ch, CURLOPT_POSTFIELDS, "Email=".$_GET['email']."&Password=".$_GET['password']);
curl_setopt($ch, CURLOPT_COOKIEFILE, $ckfile); // Uses cookies from the temp file
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
curl_setopt($ch, CURLOPT_FOLLOWLOCATION, true); // Tells cURL to follow redirects
$output = curl_exec($ch);
curl_setopt($ch, CURLOPT_URL, "https://www.nibeuplink.com/System/".$_GET['code']."/Status/ServiceInfo");
curl_setopt($ch, CURLOPT_COOKIEFILE, $ckfile);
curl_setopt($ch, CURLOPT_POST, 0);
$result = curl_exec($ch);
$pattern = '/<h3>(.*?)<\/h3>\s*<table[^>]*>.+?<tbody>(.+?)<\/tbody>\s*<\/table>/s';
if ($debug) echo "pattern: <xmp>".$pattern."</xmp><br>";
$pattern2 = '/<tr>\s*<td>(.+?)<span[^>]*>[^<]*<\/span>\s*<\/td>\s*<td>\s*<span[^>]*>([^<]*)<\/span>\s*<\/td>\s*<\/tr>/s';
if ($debug) echo "pattern2: <xmp>".$pattern2."</xmp><br>";
preg_match_all($pattern, $result, $matches);
// build json format from matches
echo '{';
$first = true;
foreach ($matches[1] as $i => $title) {
echo ($first ? '"' : ',"').trim($title).'":{';
$content = $matches[2][$i];
preg_match_all($pattern2, $content, $values);
$nestedFirst = true;
foreach ($values[1] as $j => $field) {
echo ($nestedFirst ? '"' : ',"').trim($field).'":"'.$values[2][$j].'"';
$nestedFirst = false;
}
echo "}";
$first = false;
}
echo ",\"time\":{\"Last fetch\":\"$date\"}";
echo "}";
if ($debug) {
echo "<pre><xmp>";
echo print_r($matches);
echo "<br><br>";
echo $result;
echo "</xmp></pre>";
}
?>
