“The handle is invalid“ error thrown right at the end of firmware upgrade

RE: “The handle is invalid“ error thrown right at the end of firmware upgrade

Sigurd Hellesvik — Tue, 04 Feb 2025 13:56:23 GMT

Did you see my suggestion below?

[quote user="Sigurd Hellesvik"]Agreed. Still, can you try the test only, just to debug this issue?[/quote]

I suggest that you test this and let me know how this went before moving on to the attribute question

RE: “The handle is invalid“ error thrown right at the end of firmware upgrade

WesCJ — Thu, 30 Jan 2025 16:36:45 GMT

Sigurd Hellesvik I was doing some more investigation into this issue today and I noticed that our firmware exposes a Service Changed characteristic under the "Generic Attribute" service.

However, when I try to access that "Generic Attribute" service from inside the app code (see code below), I get null.

Should the app be able to access this service? I'm wondering if the fact that the app can't access this service is the reason why the app isn't reacting to the Service Changed indications from that characteristic, resulting in the "handle is invalid" error.

RE: “The handle is invalid“ error thrown right at the end of firmware upgrade

Sigurd Hellesvik — Tue, 28 Jan 2025 15:20:14 GMT

[quote user="WesCJ"]Those are promising suggestions. However, I would ideally like to get to the bottom of why test&confirm isn't working as expected, rather than avoid using it.[/quote]

Agreed. Still, can you try the test only, just to debug this issue?

[quote user="WesCJ"]By "application", do you mean the nRF Connect Device Manager app? If so, I didn't change anything. I just ran the upgrade as instructed and that "handle is invalid" error came out when I tried reconnecting to the device.[/quote]

I mean the application running on the nRF Chip. If the hash of the nRF chip firmware is the same, DFU will be aborted.

RE: “The handle is invalid“ error thrown right at the end of firmware upgrade

WesCJ — Tue, 28 Jan 2025 14:42:13 GMT

Thanks for your replies.

[quote userid="106736" url="~/f/nordic-q-a/118022/the-handle-is-invalid-error-thrown-right-at-the-end-of-firmware-upgrade/519737"]You can do "test only" and then manually "confirm" after the swap is done.
As an alternative you can also confirm from the application, if you prefer to do local tests.[/quote]

Those are promising suggestions. However, I would ideally like to get to the bottom of why test&confirm isn't working as expected, rather than avoid using it.

[quote userid="106736" url="~/f/nordic-q-a/118022/the-handle-is-invalid-error-thrown-right-at-the-end-of-firmware-upgrade/519737"]What did you change in the application for this test DFU?[/quote]

By "application", do you mean the nRF Connect Device Manager app? If so, I didn't change anything. I just ran the upgrade as instructed and that "handle is invalid" error came out when I tried reconnecting to the device.

RE: “The handle is invalid“ error thrown right at the end of firmware upgrade

Sigurd Hellesvik — Thu, 23 Jan 2025 11:49:47 GMT

Hi,

I will continue to help with this ticket.

[quote user="WesCJ"]We need around 70 seconds for the swap to complete, which means the nRF app always times ou[/quote]

This is is you choose test&confirm.

You can do "test only" and then manually "confirm" after the swap is done.
As an alternative you can also confirm from the application, if you prefer to do local tests.

[quote user="WesCJ"]"The handle is invalid"[/quote]

What did you change in the application for this test DFU?

Regards,
Sigurd Hellesvik

RE: “The handle is invalid“ error thrown right at the end of firmware upgrade

WesCJ — Thu, 16 Jan 2025 18:21:11 GMT

Hi Charlie, I downloaded the nRF Connect Device Manager app and tried using it to upgrade the firmware on our device. Unfortunately the maximum swap time that the app can be configured to wait before confirming is 40 seconds. We need around 70 seconds for the swap to complete, which means the nRF app always times out.

Interestingly, when our bluetooth device does finally reboot and I try to pair with it from the nRF Connect Device Manager app again, I get a response which says "The handle is invalid" i.e. the same error message I initially raised this ticket about.

Does that provide any insight into what might be causing this issue?

Thanks again

RE: “The handle is invalid“ error thrown right at the end of firmware upgrade

WesCJ — Wed, 15 Jan 2025 18:21:35 GMT

Hi Charlie, thanks for your reply. I will try that tomorrow and let you know how it goes. Thanks again

RE: “The handle is invalid“ error thrown right at the end of firmware upgrade

Charlie — Wed, 15 Jan 2025 13:53:00 GMT

If this app works as expected, you can refer to its source code to learn more about the DFU implementation.

You can find a summary of related resources from our app developer in the following link:

RE: How to integrate the hardware upgrade sdk on the App？

Best regards,

Charlie

RE: “The handle is invalid“ error thrown right at the end of firmware upgrade

Charlie — Wed, 15 Jan 2025 10:07:50 GMT

Hi,

Have you tried using the nRF Connect Device Manager on the App Store available on the App Store? It’s the app currently under active maintenance, and we recommend it for developers.

Let me know the test result and we can have further discussion.

Best regards,

Charlie