Receive Push Notification with Node.js webToolkit

I'm developing a desktop application using Node-Webkit.

Now I need to receive push notifications from somewhere. This is what happens: 1) An android application sends a message to my WebApi server 2) My WebApi server receives that message and forwards it to the Node-Webkit desktop application

The desktop application can't poll the server, so I need a callback that "wakes up" the desktop application to show the message on the screen.

So I need a service that can send push notifications to an Node-Webkit client.

Is there a way to do it?

Thanks a lot!