Android DFU doesn't find firmware in assets folder

RE: Android DFU doesn't find firmware in assets folder

Aleksander Nowakowski — Tue, 13 Dec 2022 15:36:30 GMT

Cool! Btw, the difference between assets and res is that the resources are getting compressed in the APK, so are preferred. Glad that it works!

RE: Android DFU doesn't find firmware in assets folder

stmj12 — Tue, 13 Dec 2022 15:18:45 GMT

Thank you Aleksander!

That worked!

I also enabled the notification channel as you suggested in your other answer, which also worked.

RE: Android DFU doesn't find firmware in assets folder

Aleksander Nowakowski — Tue, 13 Dec 2022 12:19:30 GMT

You may also set the notification channel by calling DfuServiceInitiator.createDfuNotificationChannel(context), instead of disabling them if you want.

RE: Android DFU doesn't find firmware in assets folder

Aleksander Nowakowski — Tue, 13 Dec 2022 12:12:07 GMT

Hi, did you try res/raw folder instead? You may then pass the reference to zip file as R.raw.firmware.

RE: Android DFU doesn't find firmware in assets folder

stmj12 — Mon, 12 Dec 2022 15:24:59 GMT

Update on the current situation:

I have attempted to do the update by copying the zip file to my device and then opening the file in the application.

That resulted in the following error:

E/AndroidRuntime: FATAL EXCEPTION: main
    Process: ***, PID: 22018
    android.app.RemoteServiceException: Bad notification for startForeground
        at android.app.ActivityThread.throwRemoteServiceException(ActivityThread.java:2155)
        at android.app.ActivityThread.access$2900(ActivityThread.java:315)
        at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2381)
        at android.os.Handler.dispatchMessage(Handler.java:106)
        at android.os.Looper.loopOnce(Looper.java:226)
        at android.os.Looper.loop(Looper.java:313)
        at android.app.ActivityThread.main(ActivityThread.java:8751)
        at java.lang.reflect.Method.invoke(Native Method)
        at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:571)
        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1135)
I/Process: Sending signal. PID: 22018 SIG: 9
Disconnected from the target VM, address: 'localhost:55854', transport: 'socket'

I found this issue on the GitHub page for the DFU library, and added the solution proposed by the user "nijat2018":

fun install(context: Context, advertisement: Advertisement, uri: Uri): DfuServiceController {
    val starter = DfuServiceInitiator(advertisement.address).apply {
        setDeviceName(advertisement.name)

        setKeepBond(false)
        setForceDfu(false)

        setForceScanningForNewAddressInLegacyDfu(false)
        setPrepareDataObjectDelay(400L)
        setRebootTime(0L)
        setScanTimeout(2_000L)
        setUnsafeExperimentalButtonlessServiceInSecureDfuEnabled(true)

        setPacketsReceiptNotificationsEnabled(false)
        setPacketsReceiptNotificationsValue(12)
    }

    starter.setZip(uri)
    starter.setForeground(false)
    starter.setDisableNotification(true)
    return starter.start(context, DFUService::class.java)
}

Then the application successfully updated the device over DFU.

Now I have verified that the DFU functionality works, so all that remains is to be able to update from the zip file contained in the assets folder in the project.

- Magnus

RE: Android DFU doesn't find firmware in assets folder

stmj12 — Fri, 09 Dec 2022 16:55:13 GMT

Hello Hung Bui!

Thank you for a great response, however, it did not solve our problem.

I changed the code in the DfuServiceInitiator:

fun install(context: Context, advertisement: Advertisement): DfuServiceController {
    val starter = DfuServiceInitiator(advertisement.address).apply {
        setDeviceName(advertisement.name)

        setKeepBond(false)
        setForceDfu(false)

        setForceScanningForNewAddressInLegacyDfu(false)
        setPrepareDataObjectDelay(400L)
        setRebootTime(0L)
        setScanTimeout(2_000L)
        setUnsafeExperimentalButtonlessServiceInSecureDfuEnabled(true)

        setPacketsReceiptNotificationsEnabled(false)
        setPacketsReceiptNotificationsValue(12)
    }

    starter.setZip(Uri.parse("file:///android_assets/firmware.zip"))
    return starter.start(context, DFUService::class.java)
}

However, I still got (almost) the same error:

E/AndroidRuntime: FATAL EXCEPTION: main
    Process: ***, PID: 12973
    android.app.RemoteServiceException: Bad notification for startForeground
        at android.app.ActivityThread.throwRemoteServiceException(ActivityThread.java:2155)
        at android.app.ActivityThread.access$2900(ActivityThread.java:315)
        at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2381)
        at android.os.Handler.dispatchMessage(Handler.java:106)
        at android.os.Looper.loopOnce(Looper.java:226)
        at android.os.Looper.loop(Looper.java:313)
        at android.app.ActivityThread.main(ActivityThread.java:8751)
        at java.lang.reflect.Method.invoke(Native Method)
        at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:571)
        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1135)
E/DfuBaseService: An exception occurred while opening file
    java.io.FileNotFoundException: /android_assets/firmware.zip: open failed: ENOENT (No such file or directory)
        at libcore.io.IoBridge.open(IoBridge.java:575)
        at java.io.FileInputStream.<init>(FileInputStream.java:160)
        at java.io.FileInputStream.<init>(FileInputStream.java:115)
        at android.content.ContentResolver.openInputStream(ContentResolver.java:1523)
        at no.nordicsemi.android.dfu.DfuBaseService.openInputStream(DfuBaseService.java:1483)
        at no.nordicsemi.android.dfu.DfuBaseService.onHandleIntent(DfuBaseService.java:1199)
        at android.app.IntentService$ServiceHandler.handleMessage(IntentService.java:78)
        at android.os.Handler.dispatchMessage(Handler.java:106)
        at android.os.Looper.loopOnce(Looper.java:226)
        at android.os.Looper.loop(Looper.java:313)
        at android.os.HandlerThread.run(HandlerThread.java:67)
     Caused by: android.system.ErrnoException: open failed: ENOENT (No such file or directory)
        at libcore.io.Linux.open(Native Method)
        at libcore.io.ForwardingOs.open(ForwardingOs.java:567)
        at libcore.io.BlockGuardOs.open(BlockGuardOs.java:273)
        at libcore.io.ForwardingOs.open(ForwardingOs.java:567)
        at android.app.ActivityThread$AndroidOs.open(ActivityThread.java:8611)
        at libcore.io.IoBridge.open(IoBridge.java:561)
        at java.io.FileInputStream.<init>(FileInputStream.java:160) 
        at java.io.FileInputStream.<init>(FileInputStream.java:115) 
        at android.content.ContentResolver.openInputStream(ContentResolver.java:1523) 
        at no.nordicsemi.android.dfu.DfuBaseService.openInputStream(DfuBaseService.java:1483) 
        at no.nordicsemi.android.dfu.DfuBaseService.onHandleIntent(DfuBaseService.java:1199) 
        at android.app.IntentService$ServiceHandler.handleMessage(IntentService.java:78) 
        at android.os.Handler.dispatchMessage(Handler.java:106) 
        at android.os.Looper.loopOnce(Looper.java:226) 
        at android.os.Looper.loop(Looper.java:313) 
        at android.os.HandlerThread.run(HandlerThread.java:67) 
I/Process: Sending signal. PID: 12973 SIG: 9
Disconnected from the target VM, address: 'localhost:50997', transport: 'socket'

Here you can see that the file is in the assets folder in our project:

Do you, or the developer, have any other suggestions?

- Magnus

RE: Android DFU doesn't find firmware in assets folder

Hung Bui — Fri, 09 Dec 2022 13:29:36 GMT

Hi Magnus,
I was checking with the developer and got the following suggestion:

Based on this: https://github.com/NordicSemiconductor/Android-DFU-Library/blob/38dad6229fa949dca090cfc8a65aa26f0e4ea7f9/lib_dfu/src/main/java/no/nordicsemi/android/dfu/DfuBaseService.java#L1474

The assets file has to be given as Uri, not Path.

This method is called when the “FileUri” is not null:
https://github.com/NordicSemiconductor/Android-DFU-Library/blob/38dad6229fa949dca090cfc8a65aa26f0e4ea7f9/lib_dfu/src/main/java/no/nordicsemi/android/dfu/DfuBaseService.java#L1198-L1204

Therefore, I think it may be enough for the customer to change

starter.setZip("file:///android_assets/firmware.zip")

starter.setZip(Uri.parse("file:///android_assets/firmware.zip"))

to use this method https://github.com/NordicSemiconductor/Android-DFU-Library/blob/38dad6229fa949dca090cfc8a65aa26f0e4ea7f9/lib_dfu/src/main/java/no/nordicsemi/android/dfu/DfuServiceInitiator.java#L647-L649 instead of the one below.