title: Pusher library for Node.js or PHP which can subscribe to channels?
body: <p>I'am trying to build server-side client for Pusher. Client shoud be able to subscribe to channels and react to events... After getting info from DB etc it shoud send info to another clients (Javascript, Arduino).</p>
  
  <p>Problem is I cant find any server side library which will be able subscribing to Pusher channel and binding to events... </p>
  
  <p>Is something like this already written? Do you have some tips?</p>