code: function on(str, opts, cbk) {
        cbk = (_.isFunction(opts)) ? opts : cbk;
        cbk = cbk || function() {};
        opts = opts || {};
        ssn.server.on(str, function() {
          if (!ssn.server || (!ssn.authenticating && !ssn.authenticated)) {
            //console.log("Not Authenticated. Closing Session.", ssn.authenticating, ssn.authenticated);
            self.parent._send("vantage-close-downstream", "downstream", { sessionId: ssn.id });
            return;
          }
          cbk.apply(self, arguments);
        });
      }
docs: Listens for an event, authenticating the session first.