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pod 'ReachabilitySwift'

static func reachabilityStart()
    {
        do {
            try reachability.startNotifier()
        } catch {
            print("Unable to start notifier")
        }
        reachability.whenReachable = { reachability in
        }
        reachability.whenUnreachable = { reachability in
        }
    }
    static func reachabilityStop()
    {
        self.reachability.stopNotifier()
    }