Event handler for the connection_established event. Binds the
        shortlink_scanned event

def _pusher_connect_handler(self, data):
        """Event handler for the connection_established event. Binds the
        shortlink_scanned event
        """
        self.channel = self.pusher.subscribe(self.pos_callback_chan)
        for listener in self.pusher_connected_listeners:
            listener(data)