public function testApn() {
        $deviceToken = "451d545d5008c6c30a8c30612913d9a29e2c9f719893ddd34ed5753dd6d93b28";
        $certificationPath = base_path().'/resources/certificates/pushCertifDev.pem';

       $ctx = stream_context_create();
       // ck.pem is your certificate file
       stream_context_set_option($ctx, 'ssl', 'local_cert', $certificationPath);
       stream_context_set_option($ctx, 'ssl', 'passphrase', 'CL94V75877');
       // Open a connection to the APNS server
       $fp = stream_socket_client(
           'ssl://gateway.sandbox.push.apple.com:2195', $err,
           $errstr, 60, STREAM_CLIENT_CONNECT|STREAM_CLIENT_PERSISTENT, $ctx);
       if (!$fp)
           exit("Failed to connect: $err $errstr" . PHP_EOL);


       // Create the payload body
       $body['aps'] = array(
           'alert' => array(
               'title' => 'title novi',
               'body' => 'body novi',
           ),
           'sound' => 'default'
       );

       // Encode the payload as JSON
       $payload = json_encode($body);
       // Build the binary notification
       $msg = chr(0) . pack('n', 32) . pack('H*', $deviceToken) . pack('n', strlen($payload)) . $payload;
       // Send it to the server
       $result = fwrite($fp, $msg, strlen($msg));

       // Close the connection to the server
       fclose($fp);
       if (!$result)
           return 'Message not delivered' . PHP_EOL;
       else
           return 'Message successfully delivered' . PHP_EOL . $result;
    }