No devices found in one project but same scene works in another project

[thecodechemist99]

Hi, I might be missing something really obvious here, but so far I couldn’t figure it out.

I have set up an example scene in one unity project, where everything works fine. After I had some issues with another project, I added the same scene to that project for testing. There, I don’t see any BLE related errors in the logs, but for some reason no devices are discovered. Both projects have the same Unity version, use your latest alpha release, run on the same device (an Oculus Quest), I added the same AndroidManifest-Patch-Script to both (for the BLE permissions). I even checked the project settings if I could find anything differences that might cause this. I really have no more ideas at the moment.

Any suggestions what else to check or what might cause this? I’d be very grateful for everything ^^.

[Velorexe]

Interesting. In your app settings, are the permissions successfully given? I know that an error would occur if there's no permissions, but it's worth a shot. Other things that might influence things is the auto-loading of the .jar file in the Plugins/Android directory, this should be true.

Else if all fails (and your project isn't under MDA or other company rules), I can take a look at the project itself as well.

[thecodechemist99]

In your app settings, are the permissions successfully given? I know that an error would occur if there's no permissions, but it's worth a shot.

You mean on the Quest? Interestingly enough, my apps don’t show up in the permissions menu (or rather anywhere in the app settings) at all.

Other things that might influence things is the auto-loading of the .jar file in the Plugins/Android directory, this should be true.

Load on startup is set to true for the unityandroidble.jar in both projects.

Else if all fails (and your project isn't under MDA or other company rules), I can take a look at the project itself as well.

Thanks for the offer! I’d have to check if that’s possible with my supervisor first.

[thecodechemist99]

@Velorexe I recreated my entire example project in a fresh unity project. Made sure all the same packages are installed, all the same versions, all the same settings. The only difference left I could find were two different version of the Version Control package, but no way to update it in either of the two projects. Everything else, as far as I can tell, should now be basically identical ^^. Unfortunately, the issue stays the same. The existing example project works, the new one doesn’t.

Here’s both of the projects exported as a Unity package file, if you’d like to have a look: examples.zip.

Edit: I had one more Idea … I uninstalled the working project, restarted the Oculus, and reinstalled it. Now it actually doesn’t work anymore, either. And it throws an error:

2024/03/28 17:35:46.429 4031 4054 Error Unity NullReferenceException: Object reference not set to an instance of an object.
2024/03/28 17:35:46.429 4031 4054 Error Unity   at Android.BLE.BleManager.SendTask (Android.BLE.BleTask task, Android.BLE.IBleNotify receiver, System.Boolean runsContiniously) [0x00000] in <00000000000000000000000000000000>:0 
2024/03/28 17:35:46.429 4031 4054 Error Unity   at Android.BLE.BleManager.SearchForDevices (System.Int32 scanPeriod, Android.BLE.OnDeviceFound onDeviceFound) [0x00000] in <00000000000000000000000000000000>:0 
2024/03/28 17:35:46.429 4031 4054 Error Unity   at BleInteractor.ScanForDevices () [0x00000] in <00000000000000000000000000000000>:0 
2024/03/28 17:35:46.429 4031 4054 Error Unity   at UnityEngine.Events.UnityEvent.Invoke () [0x00000] in <00000000000000000000000000000000>:0 
2024/03/28 17:35:46.429 4031 4054 Error Unity   at UnityEngine.EventSystems.ExecuteEvents.Execute[T] (UnityEngine.GameObject target, UnityEngine.EventSystems.BaseEventData eventData, UnityEngine.EventSystems.ExecuteEvents+EventFunction`1[T1] functor) [0x00000] in <00000000000000000000000000000000>:0 
2024/03/28 17:35:46.429 4031 4054 Error Unity   at Oculus.Interaction.PointableCanvasModule.UpdatePointerEventData (UnityEngine.EventSystems.PointerEventData pointerEvent, System.Boolean pressed, System.Bool

I’m still lost, though, on why it’s now broken again. Has to be something with the permissions, but before this worked fine with the “repair script” I got from here.

[yiungyiung]

Hey i am getting the same error on my logcat, I have tried diff versions of the plugin 0.2 and the alpha 0.3, unity ver -2022.3.9f Were you able to fix the issue ?

[thecodechemist99]

Were you able to fix the issue ?

Not yet, unfortunately. But I’ve also been sick for the last weeks, so I haven’t been able to work further on this since I opened the issue. I have one thing still on my mind, though. I remember vaguely that I noticed while testing that the name of the meta SDK changed somewhere within or between my projects. I think the working version originally still had it named Oculus in the project settings and now it’s something with Meta. So maybe some change in the SDK is to blame here? Still have to further investigate this, though.

[Velorexe]

Heya,

Sorry about the silence on my part, been real busy with other projects. Seems to be an issue that's on the .NET part, but I'm not sure what would be causing it. I'll take a look in the following days to see if I can locate the issue (and update you accordingly).

@thecodechemist99 hope you're feeling better after your sickness.

[thecodechemist99]

Hi @Velorexe,

thanks for your reply. I’m finally doing better and back to work this week.

Did you get a chance to investigate the issue? As I’ll probably also take another shot at it this week and dig a little deeper.

[thecodechemist99]

Seems to be an issue that's on the .NET part

I actually suspect my original issue to be on the Java side. I have no idea what caused the NullReferenceException for me, but now after once again updating all packages in all three projects, they all behave the same again and produce the issue I originally described: No errors in the log but also no devices detected.

I’ve noticed I never shared a log of the original behaviour, sorry about that. Here’s what it looks like:

~~From the logs, everything seems to work fine on the .NET side. The task is created, sent to the Java library and just nothing ever comes back. The only issue on the .NET side I can imagine is if the Java library sends something back but it isn’t correctly detected.~~ Edit: I read the logs a bit wrong. I now understand that the Java library actually takes track of the scan time and notifies the .NET code that the search has been terminated. As it had detected devices previously, it seems to me like something in the interaction between the Java library and the devices bluetooth stack has to fail silently.

Any suggestions for debugging this further? Unfortunately, I have absolutely no experience with Java whatsoever.

[thecodechemist99]

I figured out how to better filter the logs and found some additional BLE-related logs in between:

[MaxPalmer-UH]

I and another developer in my team see the same issue - it used to scan for devices fine, now on his machine and his android device we see it start to scan and hen stop the scan with no devices found. No errors in the log output. We've tried rebooting the phone, restarting bluetooth, uninstalling and resinstalling the app (giving permissions again), logging out permission issues (no errors), changing from IL2CCP to NET and back - but we never get back the behaviour where devices are found on a scan. It's really baffling. Is there any low level logging that can be enabled, perhaps it's on the Java side.

@thecodechemist99 did you ever get to the bottom of this. One moment it was working and then never works again...

[MaxPalmer-UH]

I also now get the same behaviour on my phone, it scans but no devices are ever found.

[MaxPalmer-UH]

OK, some things that helped.

1. Make sure location services are on.
2. You may need to manually grant fine location permission to your app. There is some suggestion online that in more recent version of Android that this cannot be granted by placing it in your manifest file.