Question How to handle network timeout and retry

I want to load a scene from a remote bundle. In a good case scenario, it works perfectly, but when the internet is unable and the download timeout, I want to display an error popup with a retry button, so that players can try downloading that scene again. The problem is I can't find a way to detect if the download is failed. The Addressables system just throws a bunch of exceptions and hang.

Code (CSharp):

1. Exception encountered in operation Resource<IAssetBundleResource>(timessquare_scenes_all.bundle), status=Failed, result= : RemoteAssetBundleProvider unable to load from url https://cdn.mnm.mydomain.com/timessquare_scenes_all.bundle, result='Request timeout'.
2. UnityEngine.AsyncOperation:InvokeCompletionEvent() (at /Users/builduser/buildslave/unity/build/Runtime/Export/Scripting/AsyncOperation.cs:21)

Code (CSharp):

1. Scene 'Intro01.unity' couldn't be loaded because it has not been added to the build settings or the AssetBundle has not been loaded.

Code (CSharp):

1. NullReferenceException: Object reference not set to an instance of an object
2. UnityEngine.ResourceManagement.ResourceProviders.SceneProvider+SceneOp.InternalLoadScene (UnityEngine.ResourceManagement.ResourceLocations.IResourceLocation location, System.Boolean loadingFromBundle, UnityEngine.SceneManagement.LoadSceneMode loadMode, System.Boolean activateOnLoad, System.Int32 priority) (at Library/PackageCache/com.unity.addressables@1.16.1/Runtime/ResourceManager/ResourceProviders/SceneProvider.cs:78)
3. UnityEngine.ResourceManagement.ResourceProviders.SceneProvider+SceneOp.Execute () (at Library/PackageCache/com.unity.addressables@1.16.1/Runtime/ResourceManager/ResourceProviders/SceneProvider.cs:68)
4. UnityEngine.ResourceManagement.AsyncOperations.AsyncOperationBase`1[TObject].InvokeExecute () (at Library/PackageCache/com.unity.addressables@1.16.1/Runtime/ResourceManager/AsyncOperations/AsyncOperationBase.cs:484)
5. UnityEngine.ResourceManagement.AsyncOperations.AsyncOperationBase`1[TObject].<.ctor>b__37_0 (UnityEngine.ResourceManagement.AsyncOperations.AsyncOperationHandle o) (at Library/PackageCache/com.unity.addressables@1.16.1/Runtime/ResourceManager/AsyncOperations/AsyncOperationBase.cs:120)
6. DelegateList`1[T].Invoke (T res) (at Library/PackageCache/com.unity.addressables@1.16.1/Runtime/ResourceManager/Util/DelegateList.cs:69)
7. UnityEngine.Debug:LogException(Exception)
8. DelegateList`1:Invoke(AsyncOperationHandle) (at Library/PackageCache/com.unity.addressables@1.16.1/Runtime/ResourceManager/Util/DelegateList.cs:73)
9. UnityEngine.ResourceManagement.ResourceManager:Update(Single)
10. MonoBehaviourCallbackHooks:Update() (at Library/PackageCache/com.unity.addressables@1.16.1/Runtime/ResourceManager/Util/MonoBehaviourCallbackHooks.cs:26)

 

Bump.

 

I compare the previously downloaded bytes with the current downloaded bytes. If they are the same for 20 secs then i show a retry popup. But i am sure there must be some proper way to handle this. Anyone?