Iphone – Weird Apple Push Notification behaviour when the receiving iPhone is turned off

Firebase Cloud Messaging FCM FAQ is the new version of GCM. It inherits GCM’s core infrastructure to deliver messages reliably on Android, iOS and Chrome. However they'll continue to support GCM because lot of developers are using GCM SDKs today to handle notifications, and client app upgrade takes time.

As of June 26, 2012, Google Cloud Messaging is the preferred way of sending messages to applications running on devices.

Previously (and now deprecated), the service was called Cloud To Device Messaging.

First make sure that you're using:

• The application is compiled with debug/release provision
• your keychain has the devlopment/production push notification certificate

then use the following code (been tested both dev & production)

<?php
// Comment these lines in production mode
ini_set('display_errors','on');
error_reporting(E_ALL);


// Apns config

// true - use apns in production mode
// false - use apns in dev mode
define("PRODUCTION_MODE",false);

$serverId = 1;
$serverName = 'my-server-domain.com';

if(PRODUCTION_MODE) {
$apnsHost = 'gateway.sandbox.push.apple.com';
} else {
$apnsHost = 'gateway.push.apple.com';
}

$apnsPort = 2195;
if(PRODUCTION_MODE) {
// Use a development push certificate 
$apnsCert = $_SERVER['DOCUMENT_ROOT'].'/apns/apns-dominos-development.pem';
} else {
// Use a production push certificate 
$apnsCert = $_SERVER['DOCUMENT_ROOT'].'/apns/apns-dominos-production.pem';
}


// --- Sending push notification ---

// Insert your device token here 
$device_token = "<dc6127d8 dc6127d8 dc6127d8 dc6127d8 dc6127d8 dc6127d8 dc6127d8    dc6127d8>"; // Some Device Token


// Notification content

$payload = array();

//Basic message
$payload['aps'] = array(
'alert' => 'testing 1,2,3..', 
'badge' => 1, 
'sound' => 'default',
);
$payload['server'] = array(
'serverId' => $serverId,
 'name' => $serverName
);
// Add some custom data to notification
$payload['data'] = array(
'foo' => "bar"
);
$payload = json_encode($payload);

$streamContext = stream_context_create();
stream_context_set_option($streamContext, 'ssl', 'local_cert', $apnsCert);
stream_context_set_option($streamContext, 'ssl', 'passphrase', "");


$apns = stream_socket_client('ssl://' . $apnsHost . ':' . $apnsPort, $error,      $errorString, 2, STREAM_CLIENT_CONNECT, $streamContext);


$deviceToken = str_replace(" ","",substr($device_token,1,-1));
echo $deviceToken;
$apnsMessage = chr(0) . chr(0) . chr(32) . pack('H*', str_replace(' ', '',      $deviceToken)) . chr(0) . chr(mb_strlen($payload)) . $payload;
fwrite($apns, $apnsMessage);


//socket_close($apns);
fclose($apns);

?>