How make XMPP stanza в Java

Help please me. How make XMPP stanza в Java.

{ "to":"REGISTRATION_ID", // "to" replaces "registration_ids" "notification": { "title": "Portugal vs. Denmark”, "text”: "5 to 1” }, "time_to_live":"600" } }

String json = …;

Message message = new Message();

message.add(new GcmPacketExtension(json));

GcmPacketExtension - not class . Where take class GcmPacketExtension ?

I use smack-4.1.4

compile "org.igniterealtime.smack:smack-android:4.1.4"
compile "org.igniterealtime.smack:smack-android-extensions:4.1.4"
compile “org.igniterealtime.smack:smack-tcp:4.1.4”

I try send , not work:

//==============================

Message message = new Message();

message.addExtension(new GcmPacketExtension("" + jGcmData));

conn.sendStanza(message);

//==============================

Log.i(“111”, "Тест - " + message);

Log message:

//==============================

{“to”:“eytPI2_kHZY:APA91bF-7bCC65YG79qbc9HbKah_Vl8-_GvNzS2Rha1eU7D5f2QyEque59do 6hYxTe8TxTns9zRLsMCnJFxQiT7f0PFHLxTpZuI4sXEx1FLyMBvLVbT1TeSCK5nIIg45aYV8SvcuM2eE y5W”, “notification”:{“text”:“How is you?”}}

//==============================