How to know when FOTA Download is interrupted

RE: How to know when FOTA Download is interrupted

helsing — Thu, 15 Feb 2024 14:10:22 GMT

benna , please also provide any relevant information on how the failures are triggered so that we could potentially reproduce the same behavior.

RE: How to know when FOTA Download is interrupted

helsing — Thu, 15 Feb 2024 13:59:05 GMT

[quote user="benna"]If I should open a separate issue for this, please let me know.[/quote]

Thank you for your inputs. However, if you would like us to dig further into this it would be great if you could create a new ticket. Please refer to the relevant parts on this one, and I will be happy to continue to support you.

Please mention which nRF Connect SDK version you are using.

[quote user="benna"]Not sure about this, but it seems that the download_client_callback in fota_download.c is missing a call to stopped() in the error_and_close section:[/quote]

Our developers had a brief look at the current source file and found that error_and_close does not have any call to stopped().

RE: How to know when FOTA Download is interrupted

benna — Wed, 14 Feb 2024 16:19:19 GMT

Hi Helsing,

Thank you for following this up !

RE: How to know when FOTA Download is interrupted

helsing — Wed, 14 Feb 2024 14:46:41 GMT

Hi Ben, thank you for the suggestion. I have asked our developers to take a look at this.

RE: How to know when FOTA Download is interrupted

helsing — Wed, 14 Feb 2024 14:38:17 GMT

Hi Stephen, sorry for the long delay.

Here is the feedback from our developers:

Regarding part 1):

There is an automatic retry mechanism as can be seen from the screenshot of the logs (2 retries left...). However if retrying doesn't help SLM should report an error. Here is the result from a test I just performed where I put the modem to flight mode in the middle of the download:
#XFOTA: 1,0,0

 

#XFOTA: 1,0,1

 

#XFOTA: 1,0,2

 

#XFOTA: 1,0,2

 

#XFOTA: 1,0,3

 

#XFOTA: 1,0,4

 

#XFOTA: 1,0,5

 

#XFOTA: 1,0,5

 

#XFOTA: 1,0,6

 

#XFOTA: 1,0,7

 

#XFOTA: 1,1,2
The error is reported correctly with the last line of output.

This is with application FOTA, but I tested with the other types (delta modem, full modem) and just the same happens.

In your screenshot, is there no log after the last line, Connecting to [...]? A timeout is expected.

Would you be able to try the latest nRF Connect SDK release, v2.5.2, and at the same time could upgrade the MFW to v1.3.5? Our developers have recently made some small fixes that I think have been backported to the latest 2.5 release.

Regarding part 2)

There seems not to be any support for FOTA auto-restart after any kind of failure in the libraries used(and especially not after a restart). Starting over with a new FOTA operation is the way to go as of now. Also in the example case showed above. The one case where there is pause/resume functionality is when using AT#FOTA=0 during an ongoing download.

We would have to look further into the cloud related part of this. Does the 'downloading' status time out at some point?

RE: How to know when FOTA Download is interrupted

benna — Mon, 05 Feb 2024 17:07:33 GMT

Hi there,

I'm having a similar issue. I get the above failures, and eventually it will run out of retry counts.
When this happens, no fota_download_evt is emitted. Leaving my application to wait forever (until a watchdog finally times out).

Not sure about this, but it seems that the download_client_callback in fota_download.c is missing a call to stopped() in the error_and_close section:

error_and_close:
    atomic_clear_bit(&flags, FLAG_RESUME);
    (void)download_client_disconnect(&dlc);
    dfu_target_done(false);
    // Shouldn't we call stopped() here to transmit the error?
    return -1;

If I should open a separate issue for this, please let me know.

RE: How to know when FOTA Download is interrupted

helsing — Mon, 05 Feb 2024 15:45:26 GMT

Hi Stephen, sorry for the delay. I hope to be able to get back to you soon.

RE: How to know when FOTA Download is interrupted

SteveLaser — Mon, 29 Jan 2024 20:22:01 GMT

Thanks for your help.

RE: How to know when FOTA Download is interrupted

helsing — Fri, 26 Jan 2024 14:13:07 GMT

Hi Stephen,

Thank you for the questions, we have started looking into this.