DFU SDK10 peer data not exchanged DfuTarg (normal address + 1)

[makouda]

I'm trying to perform OTA programming with DFU.

when I load only softdevice and bootloader I got address xx:xx:xx:xx:xx:2E

then I load the app with DFU, now the address is xx:xx:xx:xx:xx:2D which means that the peer data is not exchanged

then I try to flash using DFU, I got error, then it jump to DfuTarg advertising again and now DFU is working (it only preform DFU when advertising is DfuTarg)

according to Nordic answer to this question RAM data may be reinitialized. Im' using keil and the bootloader configurations are below. I'm not using any customized linker script

[Wojtek]

What is the question? I think this is exactly expected behavior.

[makouda]

my question is why it fails to perform DFU at first time when advertising my application and then I should perform another attempts (use nrf tool box again, load the zip and perform Dfu), this time it advertise DfuTarg and then succeed.

[Wojtek]

Bootloader just works like that. Withthat kind of design you don't double your code by having functions of flashing and veryfying the image both in the app and in bootloader. In app you just have to restart (jump) to bootloader and do the rest of the work there. It is a bit annoying using nrftoolbox though, but it is some kind of compromise.

[makouda]

I dont think it's the case, I remember doing just one DFU flashing : when advertising my app I perform DFU with nrftoolbox and it succeed. I assume that I used softdevcie 7 and a precompiled bootloader which doest resemble to the one given in example (I had no access to code). so my question : can I perform some modifications on the bootloader or in my app to DFU flashing at one step? can you advice me any related source code. :)

[Wojtek]

I am not 100% sure but i think the oldest bootloader also worked in similar way. I am using custom script which starts DFU, waits for DfuTarg and performs the rest automatically so I am not annoyed by nrf toolbox. Maybe someone from Nordic will clarify this for You, but i think I have seen thread that described that issue, you can do some search for it here.