gistfile1.java

        SimplePushClient client = new SimplePushClient("wss://push.services.mozilla.com");

        client.connect();

        client.register(new RegistrationListener() {
            @Override
            public void onRegistered(String channelId, String pushEndpoint) {
                System.out.println(pushEndpoint);
            }
        });

        client.addMessageListener(new MessageListener() {
            @Override
            public void onMessage(Ack ack) {
                System.out.println("Message received for " + ack);
            }
        });

        try {
            Thread.currentThread().join();
        }
        catch (InterruptedException e) {
            e.printStackTrace();
        }
    }