APNS Push notification Background non working anymore - ios

Question

Sorry to repost this question as it was asked a few times, but no answer was ok for me.
My app don't wake up anymore on background notification.
So I updated my php script and added HEADERs field as documented here and here
But no luck.
Here my sample code :
<?php
$device_token = 'd98e1d488acac56305a9f83b...b616bc5b5b3bf238dc';
//$device_token = '27b296397f81f48590a....fe2742e0b2a051ae2cefffded85d7';
// Put your private key's passphrase here:
$pem_secret = '';
$pem_file = 'pushcert.pem';
$url = "https://api.development.push.apple.com/3/device/$device_token";
//$body = '{"aps":{"alert":"balbla","badge":0,"sound":"default"}}';
$body = '{"aps":{"content-available":1},"acme1":"bar"}';
$header = ['apns-topic'=>'com.blabla.bla',
'apns-push-type'=>'background',
'apns-priority'=>'5'
];
$ch = curl_init();
curl_setopt($ch, CURLOPT_URL,$url);
curl_setopt($ch, CURLOPT_POST,1);
curl_setopt($ch, CURLOPT_POSTFIELDS, $body);
curl_setopt($ch, CURLOPT_HTTP_VERSION, CURL_HTTP_VERSION_2_0);
curl_setopt($ch, CURLOPT_HTTPHEADER, $header);
curl_setopt($ch, CURLOPT_SSLCERT, $pem_file);
curl_setopt($ch, CURLOPT_SSLCERTPASSWD, $pem_secret);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
$information = curl_getinfo($ch);
$response = curl_exec($ch);
$httpcode = curl_getinfo($ch, CURLINFO_HTTP_CODE);
//On successful response you should get true in the response and a status code of 200
//A list of responses and status codes is available at
//https://developer.apple.com/library/ios/documentation/NetworkingInternet/Conceptual/RemoteNotificationsPG/Chapters/TheNotificationPayload.html#//apple_ref/doc/uid/TP40008194-CH107-SW1
//var_dump($header);
//var_dump($information);
var_dump($response);
var_dump($httpcode);
?>
I never enter the iOS methode to catch this notification :
-(void)application:(UIApplication *)application didReceiveRemoteNotification:(NSDictionary *)userInfo fetchCompletionHandler:(void (^)(UIBackgroundFetchResult))completionHandler {
[[NSUserDefaults standardUserDefaults] setValue:userInfo forKey:#"testtesttest"];
// Method called when user click on notification and application is in background
application.applicationIconBadgeNumber = 0;
NSLog(#"did received remote notification"); }
Also in my device console, it seems that the device is canceling my notifications or something a don't get.
Also not that standard notifications (not in Background) works fine.
testing iOS 13.3.1
Thanks a lot for any help you could get me.
Background mode enabled :
<key>UIBackgroundModes</key>
<array>
<string>fetch</string>
<string>location</string>
<string>processing</string>
<string>remote-notification</string>
</array>
App Settings also configured :

Answer 1

I managed to make it Work with that sample code:
<?php
// open connection
if (!defined('CURL_HTTP_VERSION_2_0')) {
define('CURL_HTTP_VERSION_2_0', 3);
}
$device_token = 'd56e9ef8b5ea558f07584cf8...498824ece60a36229446a2003116'; //David
// Put your private key's passphrase here:
$pem_secret = '';
$pem_file = 'pushcert.pem';
$url = "https://api.development.push.apple.com/3/device/$device_token";
$app_bundle_id = "com.blabla.blabla";
//$body = '{"aps":{"alert":"balbla","badge":0,"sound":"default"}}';
$body = '{
"aps":{"content-available":1},
"type":"LOCATION",
"idRequest":"538EAC3E765A4BDC89B554C40F5B14EF"
}';
$headers = array(
"apns-topic: {$app_bundle_id}",
"User-Agent: My Sender",
"apns-push-type:background",
"apns-priority:5"
);
var_dump($body);
$ch = curl_init();
curl_setopt($ch, CURLOPT_HTTP_VERSION, CURL_HTTP_VERSION_2_0);
curl_setopt($ch, CURLOPT_URL,$url);
curl_setopt($ch, CURLOPT_PORT,443);
curl_setopt($ch, CURLOPT_HTTPHEADER, $headers);
curl_setopt($ch, CURLOPT_POST,TRUE);
curl_setopt($ch, CURLOPT_POSTFIELDS, $body);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, TRUE);
curl_setopt($ch, CURLOPT_TIMEOUT, 30);
curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, FALSE);
curl_setopt($ch, CURLOPT_SSLCERT, $pem_file);
curl_setopt($ch, CURLOPT_HEADER, TRUE);
$response = curl_exec($ch);
$information = curl_getinfo($ch,CURLOPT_HTTPHEADER);
$httpcode = curl_getinfo($ch, CURLINFO_HTTP_CODE);
//On successful response you should get true in the response and a status code of 200
//A list of responses and status codes is available at
//https://developer.apple.com/library/ios/documentation/NetworkingInternet/Conceptual/RemoteNotificationsPG/Chapters/TheNotificationPayload.html#//apple_ref/doc/uid/TP40008194-CH107-SW1
//var_dump($header);
var_dump($information);
var_dump($response);
var_dump($httpcode);
?>
Well at least it seems that the application is waking up (seen in the device log)
So this morning I launch the code from yesterday (with no modifications at all) and it worked for a few times, like 4 or 5 times.
Now it doesn't work anymore. Same as yesterday (iOS system seems to catch the payload, but application is not waked up)
-> conclusion, this a system limitation, and this is so confusing when you need to perfom tests. I'm gonna put this in production with no assurance it will work properly...