DfuInstallation.Start throws Cannot access a disposed object on iOS

[Umer-Mahmood]

Describe the bug Device firmware update works for android but fails for iOS as soon as I call Start() method on Laerdal.Dfu.DfuInstallation instance. To Reproduce Steps to reproduce the behavior:

1. Add Laerdal.Dfu 1.25.2 in shared project, android project and iOS project
2. Call StartDfu which is implemented as:

  public async Task StartDfu()
        {
            var updater = new Laerdal.Dfu.DfuInstallation(_deviceId, _embeddedDfuFile);
            updater.Start();
        }

Expected behavior The device firmware process should start successfully as it does in android.

Call stack

[0:] An error occurred: 'Cannot access a disposed object.
Object name: 'Laerdal.Dfu.iOS.DFUFirmware'.'. Callstack: '  at ObjCRuntime.ThrowHelper.ThrowObjectDisposedException (System.Object o) [0x00000] in /Library/Frameworks/Xamarin.iOS.framework/Versions/16.0.0.92/src/Xamarin.iOS/ObjCRuntime/ThrowHelper.cs:52 
  at ObjCRuntime.NativeObjectExtensions.GetNonNullHandle (ObjCRuntime.INativeObject self, System.String argumentName) [0x0001b] in /Library/Frameworks/Xamarin.iOS.framework/Versions/16.0.0.92/src/Xamarin.iOS/ObjCRuntime/INativeObject.cs:35 
  at Laerdal.Dfu.iOS.DFUServiceInitiator.WithFirmware (Laerdal.Dfu.iOS.DFUFirmware file) [0x00000] in /_/Laerdal.Dfu/obj/Release/xamarin.ios10/iOS/Laerdal.Dfu.iOS/DFUServiceInitiator.g.cs:139 
  at Laerdal.Dfu.DfuInstallation.SetInitiator () [0x00094] in /_/Laerdal.Dfu/iOS/DfuInstallation.cs:38 
  at Laerdal.Dfu.DfuInstallation.Start () [0x00013] in /_/Laerdal.Dfu/iOS/DfuInstallation.cs:102 
  at Config.Views.DfuTest.StartDfu () [0x000d5] in C:\sportident\six\config_app\Config\Views\DfuTest.xaml.cs:39 
  at Config.Views.DfuTest.Button_Clicked (System.Object sender, System.EventArgs e) [0x00020] in C:\sportident\six\config_app\Config\Views\DfuTest.xaml.cs:72 
  at System.Runtime.CompilerServices.AsyncMethodBuilderCore+<>c.<ThrowAsync>b__7_0 (System.Object state) [0x00000] in /Library/Frameworks/Xamarin.iOS.framework/Versions/Current/src/Xamarin.iOS/mcs/class/referencesource/mscorlib/system/runtime/compilerservices/AsyncMethodBuilder.cs:1021 
  at (wrapper delegate-invoke) <Module>.invoke_void_object(object)
  at Foundation.NSAsyncSynchronizationContextDispatcher.Apply () [0x00000] in /Library/Frameworks/Xamarin.iOS.framework/Versions/16.0.0.92/src/Xamarin.iOS/Foundation/NSAction.cs:178 
--- End of stack trace from previous location where exception was thrown ---

  at (wrapper managed-to-native) UIKit.UIApplication.xamarin_UIApplicationMain(int,string[],intptr,intptr,intptr&)
  at UIKit.UIApplication.UIApplicationMain (System.Int32 argc, System.String[] argv, System.IntPtr principalClassName, System.IntPtr delegateClassName) [0x00000] in /Library/Frameworks/Xamarin.iOS.framework/Versions/16.0.0.92/src/Xamarin.iOS/UIKit/UIApplication.cs:57 
  at UIKit.UIApplication.Main (System.String[] args, System.String principalClassName, System.String delegateClassName) [0x00013] in /Library/Frameworks/Xamarin.iOS.framework/Versions/16.0.0.92/src/Xamarin.iOS/UIKit/UIApplication.cs:82 
  at Config.iOS.Application.Main (System.String[] args) [0x00001] in C:\sportident\six\config_app\Config.iOS\Main.cs:12 
  at (wrapper managed-to-native) System.Reflection.RuntimeMethodInfo.InternalInvoke(System.Reflection.RuntimeMethodInfo,object,object[],System.Exception&)
  at System.Reflection.RuntimeMethodInfo.Invoke (System.Object obj, System.Reflection.BindingFlags invokeAttr, System.Reflection.Binder binder, System.Object[] parameters, System.Globalization.CultureInfo culture) [0x0006a] in /Library/Frameworks/Xamarin.iOS.framework/Versions/Current/src/Xamarin.iOS/mcs/class/corlib/System.Reflection/RuntimeMethodInfo.cs:395 '
The app has been terminated.

Smartphone (please complete the following information):

• Device: iPhone 11
• OS: iOS15.6.1

Additional context The exception does not seem to depend on what I pass as device id and dfu file path.