Connect to TwilioChatClient when internet is off

[Hamza123Imran]

Hi, i have a chat app i'm using twilio in that. Now my backend developer has configure the backend properly. When i run app i hit an API to my backend server and in response i get the twilio chat token. Then i initialize the chat client. This works fine, now when i want to run my app when app is not connected to internet. For this i store the twilio chat token in my core data entity and sent this stored token for my function that initialize the TwilioChatClient. Now when i hit these commands when internet is not connected, it shows me Client is not connected in my console. Now i have a question that how can i connect myself to TwilioChatClient when my internet is off. This is the code that how i get the twilio token from my backend server through API,
`func fetchTwilioToken(_ myNumber: String, completion: @escaping ((Bool) -> Void)) {

    //Check internet status
    netStatus = UserDefaults.standard.string(forKey: "netStatus")!
    print(netStatus!)

    network.reachability.whenReachable = { reachability in
        self.netStatus = "Yes"
    }

    network.reachability.whenUnreachable = { reachability in
        self.netStatus = "No"
    }
    
    if netStatus == "Yes"
    {

    let deviceId = UIDevice.current.identifierForVendor!.uuidString
    let params : [String : Any] = ["token" : myNumber, "deviceId": deviceId]
    print(params)
    ServerCall.makeCallWitoutFile(TwilioChatTokenUrl, params: params, type: Method.POST, currentView: nil) { (response) in
        
        if let json = response {
            print(json)
            setTwilioChatToken(token: json["twillio_token"].stringValue)
            let token = json["twillio_token"].stringValue
            print(token)
            
            let appDelegate = UIApplication.shared.delegate as? AppDelegate
            let context = appDelegate?.persistentContainer.viewContext
            let entity = NSEntityDescription.entity(forEntityName: "TwilioChatTokenCoreData", in: context!)
            let user = NSManagedObject(entity: entity!, insertInto: context)

            user.setValue(token, forKey: "twilioToken")
            do {
                try context?.save()
                print("Saved successfully.")
                self.getTwilioTokenData({(client) in
                    if client
                    {
                        completion(true)
                    }
                    else
                    {
                        completion(false)
                    }

                })

            } catch  {
                print("Fail to save")
            }
            self.initiateChatClient({ (clientRcvd) in
                if clientRcvd {
                    completion(true)
                }else {
                    completion(false)
                }
            })
        }else {
            completion(false)
            topViewController()?.showAlert("Connection is Weak!\nChat is not updated")
       
        }
        }
    }
    else
    {
        self.getTwilioTokenData({(client) in
            if client
            {
                completion(true)
            }
            else
            {
                completion(false)
            }
            
        })
    }
}`

And this is how i pass my stored twilio chat token to initialize chat client,
` func initiateChatClient(_ completion: @escaping ((Bool) -> Void)) {

  //  if let token = TwilioChatToken {
    let token  = twilioToken
    print(token)
    TwilioChatClient.chatClient(withToken: token, properties: nil, delegate: self) {
            (result, chatClient) in
            
            if let client = chatClient {
                print("Reachability: \(client.isReachabilityEnabled())")
                self.chatClient = client
                appDeleg.chatClient = client
                if let username = client.user?.friendlyName {
                    print("Logged in as \(username)")
                }else {
                    if let user = UserDefaults.standard.object(forKey: key_My_Profile) as? UserProfile {
                        client.user?.setFriendlyName(user.name, completion: { (results) in
                            print(result.resultText!)
                        })
                    }
                }

                completion(true)
            }else {
                completion(false)
                print("Client is not connected")
                topViewController()?.showAlert("Connection is Weak!\nChat is not updated")
            }
        }
    //}
}`