Sending a push notification from the simulator or mobile device is pretty trivial when we use the Push
class. However, sending push messages from the server seems to be a bit more complicated for most developers
since its not as well documented. The main point of complexity is that we didn’t provide any samples of server
push code and from the fact that the server expects arguments as POST.

This code should work for Java desktop and server side to perform a simple push, notice that the complexity is
mostly related to JavaSE’s lack of simplified POST arguments.

URLConnection connection = new URL("https://codename-one.appspot.com/sendPushMessage").openConnection();
connection.setDoOutput(true); 
connection.setRequestMethod("POST");
connection.setRequestProperty("Content-Type", "application/x-www-form-urlencoded;charset=UTF-8");
String query = "packageName=PACKAGE_NAME&[email protected]&device=" + deviceId +
                    "&type=1&auth=GOOGLE_AUTHKEY&certPassword=CERTIFICATE_PASSWORD&" +
                    "cert=LINK_TO_YOUR_P12_FILE&body=" + URLEncoder.encode(MESSAGE_BODY, "UTF-8"); 
try (OutputStream output = connection.getOutputStream()) {
    output.write(query.getBytes("UTF-8"));
}
int c = connection.getResponseCode();

The PHP code below was sent to us by a developer, we didn’t test it but got feedback that it works fine.

$args = http_build_query(array(
'certPassword' => 'CERTIFICATE_PASSWORD',
'cert' => 'LINK_TO_YOUR_P12_FILE',
'production' => false,
'device' => $device['deviceId'],
'packageName' => 'YOUR_APP_PACKAGE_HERE',
'email' => 'YOUR_EMAIL_ADDRESS_HERE',
'type' => 1,
'auth' => 'YOUR_GOOGLE_AUTH_KEY',
'body' => $wstext));
$opts = array('http' =>
    array(
        'method'  => 'POST',
        'header'  => 'Content-type: application/x-www-form-urlencoded',
        'content' => $args 
    )
);
$context = stream_context_create($opts);
$response = file_get_contents("https://codename-one.appspot.com/sendPushMessage", false, $context);