Error 133 (0x85) Gatt Error while implementing DFU

[ZaQa]

Hi,

I am using nRF52832 as the main microcontroller in my project. I wanted to add Nordic Semiconductor buttonless DFU to my application and now it's working correctly with all the example applications from SDK17 but when I upload my own new version of the application through Bluetooth, however, the uploading process completes successfully, the nrf connect log ends up with the Error 133 (0x85): Gatt Error (attached screenshot). And my device not working or advertising; it does absolutely nothing!

 Any advice? I would appreciate any help with this issue.

[Simonr]

Hi

By "your own new version", can you share some information on what you changed? Are you working on a development kit with debugging opportunities or a custom design? The GATT Error 133 (0x85) is a very generic error that could mean a number of things, and at the end of the DFU update only means that it loses connection really. I think you will need to debug to get some kind of error messages on the nRF52832 side to get to the bottom of this.

Best regards,

Simon

[ZaQa]

A feature of saving data on Flash has been added to the new version of the application.
I use a custom design board, however, I can attach a programmer to it and debug it through segger embedded studio. The thing is that I have no idea how to get logs in an application plus bootloader. I am a pretty newbie in this field, can you help me please, and give me some cues on how can I get logs and error messages in this special case?

[Simonr]

Hi

I'd recommend building the "debug version" of a bootloader so that you can get some logging over RTT from both the bootloader and application on your board. We have this guide by my colleague Hung explaining how to get started with the bootloader in the nRF5 SDK.

Best regards,

Simon

[ZaQa]

Thank you!

Apparently, in the new version of my application, too many virtual pages were assigned to FDS and data saving. Reducing the number of FDS_VIRTUAL_PAGES has solved the problem. Now it's working perfectly!

Best regards,

ZaQa

[Simonr]

Glad to hear that! Marking this case as resolved then. Don't hesitate to create a new case if you run into any further trouble.