How to get server address and remoteIdentifier? - ios

Question

I am able to save VPN configuration. Please tell me how to make the server address variable or get a server address and what is the remote identifier for?
I have used this example for reference: Connect to a VPN with certificate - iOS/Swift
How can I solve this?
func connectVPN(){
do {
if let file = URL(string: "example.com") {
let data = try Data(contentsOf: file)
let json = try JSONSerialization.jsonObject(with: data, options: [])
if let object = json as? [String: String] {
// json is a dictionary
var data_VPN = object["VPN_data"]!
//print("Donebro:\(data_VPN)")
let certificate = data_VPN
let nsdata = certificate.data(using: .utf8)
let base64EncodedData = nsdata!.base64EncodedData()
print("base64StoreData:\(nsdata!)")
print("base64StoreNewData:\(base64EncodedData)")
var vpnManager = NEVPNManager.shared()
vpnManager.loadFromPreferences { error in
if vpnManager.`protocol` == nil{
let newIPSec = NEVPNProtocolIPSec()
newIPSec.serverAddress = ""
newIPSec.localIdentifier = ""
newIPSec.remoteIdentifier = ""
newIPSec.useExtendedAuthentication = true
newIPSec.identityData = base64EncodedData as! Data
newIPSec.authenticationMethod = NEVPNIKEAuthenticationMethod.certificate
print("VPNDATA:\(newIPSec)")
if #available(iOS 9, *) {
vpnManager.protocolConfiguration = newIPSec
} else {
vpnManager.`protocol` = newIPSec
}
vpnManager.isEnabled = true
vpnManager.saveToPreferences(completionHandler: { (error) -> Void in
if ((error) != nil) {
print("VPN Preferences error: 2")
}
else {
vpnManager.loadFromPreferences(completionHandler: { (error) in
if ((error) != nil) {
print("VPN Preferences error: 2")
}
else {
var startError: NSError?
do {
try vpnManager.connection.startVPNTunnel()
}
catch let error as NSError {
startError = error
print(startError)
}
catch {
print("Fatal Error")
fatalError()
}
if ((startError) != nil) {
print("VPN Preferences error: 3")
let alertController = UIAlertController( title: "Oops..", message: "Something went wrong while connecting to the VPN. Please try again.", preferredStyle: UIAlertControllerStyle.alert)
alertController.addAction( UIAlertAction(title: "Dismiss", style: UIAlertActionStyle.default,handler: nil))
self.present(alertController, animated: true, completion: nil)
print(startError)
}
else {
//VPNStatusDidChange(nil)
print("Start VPN")
}
}
})
}
})
}
} else if let object = json as? [Any] {
// json is an array
for anItem in object as! [Dictionary<String, AnyObject>] {
let industryName = anItem["VPN_data"] as! String
}
} else {
print("JSON is invalid")
}
} else {
print("no file")
}
} catch {
print(error.localizedDescription)
}
}
}