func saveImage() {
    let documentsDirectoryURL = try! FileManager().url(for: .documentDirectory, in: .userDomainMask, appropriateFor: nil, create: true)
    let file2ShareURL = documentsDirectoryURL.appendingPathComponent("config.n2kHunt")

    var json: Any?
    let encodedData = try? JSONEncoder().encode(products)
    if let data = encodedData {
        json = try? JSONSerialization.jsonObject(with: data, options: .allowFragments)
        if let json = json {
            do {
                try String(describing: json).write(to: file2ShareURL, atomically: true, encoding: .utf8)
            } catch {
                print("unable to write")
            }
        }
    }
}

(
    {
    identity = "blah-1";
    major = 245;
    minor = 654;
    url = "https://web1";
    uuid = f54321;
},
    {
    identity = "blah-2";
    major = 543;
    minor = 654;
    url = "https://web2";
    uuid = f6789;
}

func application(_ app: UIApplication, open url: URL, options: [UIApplicationOpenURLOptionsKey : Any] = [:]) -> Bool {

    do {
        let string2D = try? String(contentsOf: url)
        let jsonData = try? JSONSerialization.data(withJSONObject: string2D)
        do {
            products = try JSONDecoder().decode([BeaconDB].self, from: jsonData!)
        } catch let jsonErr {
            print("unable to read (jsonErr)")
        }

    }  catch {
        print("application error")
    }
   }