SDK12 DFU service not found

[jpolvi]

I am developing software for a custom hardware based on NRF52. Previously I was tasked on updating the old NRF51 based software (used on older version of the device) for NRF52 using SDK11. Once that was done my next task was updating the software for SDK12. The software is otherwise working fine but I am having problems with DFU. I tried creating a zip of the application and flashed the combined softdevice/bootloader from SDK12 examples folder (dfu/ble_dfu_send_hex) to the device. The device shows as DfuTest on the mobile DFU app but when I try to upload the zip all I get is "DFU service not found". I also tried compiling the secure DFU bootloader example and using that instead but the result is the same.

Do I need to also have DFU support in the application for that to work ? Currently the application has some kind of DFU functionality from the earlier SDK 11 implementation but I'm guessing that wont work. Any examples to study so that I can implement the functionality ?

[Hung Bui]

8e400001-f315-4f60-9fb8-838830daea50 is the UUID we generated for the experimental_ble_app_buttonless_dfu example. It's random generated and not official Bluetooth SIG UUID. So it's normal to see "Unknown service" for that service in the app. You are free to generate your own 128 bit service UUID for the purpose of switching from application to DFU. There is no specific requirement there. To switch from application to bootloader please follow the documentation about the example in the SDK.