     private let _renewSubscriptionSessionManager = AFHTTPSessionManager()
     private let _unsubscribeSessionManager = AFHTTPSessionManager()
     private let _defaultSubscriptionTimeout: Int = 300
-    private var _backupSubscriptions = [Subscription]()
     private var _eventCallBackURL: NSURL? {
         let wifiInterface = "en0"
         if let address = getIFAddresses()[wifiInterface] {

                }
            })
            }, failure: { (task: NSURLSessionDataTask?, error: NSError) -> Void in
                if let completion = completion {
                    completion(result: .Failure(error))
                }

            
            subscription.update(response.subscriptionID, expiration: expiration)
            
            DDLogInfo("Successfully renewed subscription with timeout: \(response.timeout/60) mins: \(subscription)")
            
            // read just in case it was removed
            self.add(subscription: subscription, completion: { () -> Void in
                if let completion = completion {
