Android 6 Master Control Panel Bonded DFU + Android 6 gets stuck in a loop

[Clem Taylor]

I'm not sure why I didn't notice this sooner.

When trying to do a bonded DFU with a Nexus 6P and Master Control Panel it seems to get stuck in a loop reconnecting.

I connect, bond and trigger a DFU and then MCP disconnects, reconnects, disconnects in a loop. It never attempts to trigger the switch to the bootloader.

However if I manually write the start command to the DFU control point, everything works just fine.

Android 5.1.1 on a Nexus 4 works just fine.

master-control-panel-log.txt or: gist.github.com/.../a51e30a8a41d5f02bb3c

[Aleksander Nowakowski]

Hi, the reason thy it gets in a loop is that the DFU Version is always read as 0.1, which means that that's the application mode, not the bootloader mode. If it works when you manually write the start command, it means that the chip restarts after it disconnects, and does not start the DFU mode at all (or does, but immediately resets afterwards). The question is why..? I'm not quite sure. Nexus 4 sends just 1 packet each connection interval so it's very slow. Maybe it gives more time to the device to set itself up. We don't have the 6P yet, so it's hard to test, but it's a metter of time only.

Did you try the DFU with nRF Toolbox? It has a slightly newer version of the DFU library... There is a small chance it would work.

[Clem Taylor]

That apk fixes the problem in the nRF Toolbox. I was able to upload firmware from a non-bonded device without a crash.

While on the topic of crashing :-) I get a number of different nRF Master Control panel crashes as well:

Something that looks like the bug above:

11-10 19:06:56.707 18218 21775 E AndroidRuntime: FATAL EXCEPTION: IntentService[DfuBaseService]
11-10 19:06:56.707 18218 21775 E AndroidRuntime: Process: no.nordicsemi.android.mcp, PID: 18218
11-10 19:06:56.707 18218 21775 E AndroidRuntime: java.lang.NullPointerException: Attempt to get length of null array
11-10 19:06:56.707 18218 21775 E AndroidRuntime:        at android.bluetooth.BluetoothGattCharacteristic.getIntValue(BluetoothGattCharacteristic.java:445)
11-10 19:06:56.707 18218 21775 E AndroidRuntime:        at no.nordicsemi.android.dfu.DfuBaseService.readVersion(DfuBaseService.java:2187)
11-10 19:06:56.707 18218 21775 E AndroidRuntime:        at no.nordicsemi.android.dfu.DfuBaseService.onHandleIntent(DfuBaseService.java:1339)
11-10 19:06:56.707 18218 21775 E AndroidRuntime:        at android.app.IntentService$ServiceHandler.handleMessage(IntentService.java:66)
11-10 19:06:56.707 18218 21775 E AndroidRuntime:        at android.os.Handler.dispatchMessage(Handler.java:102)
11-10 19:06:56.707 18218 21775 E AndroidRuntime:        at android.os.Looper.loop(Looper.java:148)
11-10 19:06:56.707 18218 21775 E AndroidRuntime:        at android.os.HandlerThread.run(HandlerThread.java:61)

Along with:

11-13 16:59:20.338  6283  6283 E AndroidRuntime: FATAL EXCEPTION: main
11-13 16:59:20.338  6283  6283 E AndroidRuntime: Process: no.nordicsemi.android.mcp, PID: 6283
11-13 16:59:20.338  6283  6283 E AndroidRuntime: java.lang.IllegalStateException: Can not perform this action after onSaveInstanceState
11-13 16:59:20.338  6283  6283 E AndroidRuntime:        at android.support.v4.app.FragmentManagerImpl.checkStateLoss(FragmentManager.java:1377)
11-13 16:59:20.338  6283  6283 E AndroidRuntime:        at android.support.v4.app.FragmentManagerImpl.enqueueAction(FragmentManager.java:1395)
11-13 16:59:20.338  6283  6283 E AndroidRuntime:        at android.support.v4.app.BackStackRecord.commitInternal(BackStackRecord.java:637)
11-13 16:59:20.338  6283  6283 E AndroidRuntime:        at android.support.v4.app.BackStackRecord.commit(BackStackRecord.java:616)
11-13 16:59:20.338  6283  6283 E AndroidRuntime:        at no.nordicsemi.android.mcp.scanner.connection.ConnectedDevicesActivity.onItemSelected(ConnectedDevicesActivity.java:161)
11-13 16:59:20.338  6283  6283 E AndroidRuntime:        at android.widget.AdapterView.fireOnSelected(AdapterView.java:931)
11-13 16:59:20.338  6283  6283 E AndroidRuntime:        at android.widget.AdapterView.dispatchOnItemSelected(AdapterView.java:920)
11-13 16:59:20.338  6283  6283 E AndroidRuntime:        at android.widget.AdapterView.-wrap1(AdapterView.java)
11-13 16:59:20.338  6283  6283 E AndroidRuntime:        at android.widget.AdapterView$SelectionNotifier.run(AdapterView.java:890)
11-13 16:59:20.338  6283  6283 E AndroidRuntime:        at android.os.Handler.handleCallback(Handler.java:739)
11-13 16:59:20.338  6283  6283 E AndroidRuntime:        at android.os.Handler.dispatchMessage(Handler.java:95)
11-13 16:59:20.338  6283  6283 E AndroidRuntime:        at android.os.Looper.loop(Looper.java:148)
11-13 16:59:20.338  6283  6283 E AndroidRuntime:        at android.app.ActivityThread.main(ActivityThread.java:5417)
11-13 16:59:20.338  6283  6283 E AndroidRuntime:        at java.lang.reflect.Method.invoke(Native Method)
11-13 16:59:20.338  6283  6283 E AndroidRuntime:        at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726)
11-13 16:59:20.338  6283  6283 E AndroidRuntime:        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616)

No clue what I was doing when that crash occurred.