DFU fail while process through buttonless project

[Max Liao]

Hi,

I got a problem that doing the DFU through buttonless example, but successfully upgrade only in bootloader.

I used OPPO R9s (Android 6) with my personal cell phone and the Samsung reference phone (Android 5) provided from my customer.

Both phones got the problem that while I do the DFU in application, the connection stuck in connecting and when time out the DFU failed.

But if I only download the bootloader in chip, the DFU can successfully upgrade.

I used SDK v15 and softdevice is 6.0.0

On my cell phone I used nRF Connect APP

Does anyone got this problem before?

Thanks.

[Hung Bui]

Hi Max, 

A sniffer trace would greatly help identifying the issue. 

Do you have any modification to the code of the bootloader/the buttonless project ? 

Do you do buttonless with bonding or not ? 

Could you provide any log ? 

[Max Liao]

Dear Hung Bui

I haven't trace it yet, I'll arrange a time to do it when my top priority has done.

I didn't modify the bootloader, and the buttonless I only implement with my application, the part of DFU I didn't modify with.

And I using without bond DFU that set as default in buttonless example.
Here's the log that catch from the application side when the DFU trig.

 0> <info> app: Received indication state 1
 0> <info> app: Device is preparing to enter bootloader mode.
 0> <info> app: Device will enter bootloader mode.
 0> <info> app: Power management wants to reset to DFU mode.
 0> <INFO> [app_shutdown_handler]: Device ready to enter bootloader..
 0> <info> app: Power management allowed to reset to DFU mode.

And then I got nothing more, although I turn on the log in bootloader, I also don't get any log from there. After a while the device seems timeout and reboot, the application still the old one.

[Hung Bui]

Hi MaxLiao, 

Could you check if it actually enter bootloader ? Do you have any LED to indicate that it enters the bootloader ? 

Do you modify the address in your application ? 

Could you test with the buttonless example we provided in our SDK ? 

Regarding monitoring the RTT log to log both application and bootloader, you may need to have a look here or here.