Not able to make xmpp connection between my app server and GCM's CCS using XMPPHP library

Question

Like push-notification(downstream message), I want to implement upstream messaging from my android device to my app server in php.

I am using this XMPPHP library from Github to connect my app server to GCM's CCS. But when I try to execute below code to connect GCM's CCS:

include 'XMPPHP/XMPP.php';
$conn = new XMPPHP_XMPP('gcm-preprod.googleapis.com', 5236, '<myProjectId>@gcm.googleapis.com', '<myApiKey>', 'xmpphp', 'http://myserverdomain', $printlog=true, $loglevel=XMPPHP_Log::LEVEL_INFO);
$conn->autoSubscribe();
$vcard_request = array();
try {
  $conn->connect();
...

I am getting following error.

1455354076 [INFO]: Connecting to tls://gcm-preprod.googleapis.com:5236 1455354106 [ERROR]: Could not connect. Could not connect before timeout.

Answer 1

This is most probably caused by the fact that CCS doesn't currently support the STARTTLS extension. I had the sampe problem with elixir and hedwig (see here).

Sadly I don't have enough php knowledge to check whether your XMPP library supports this, but maybe this SO thread can help you to get started with CCS and PHP.