DFU mode and BLE

RE: DFU mode and BLE

Vidar Berg — Mon, 24 Jan 2022 13:01:30 GMT

The app advertising may be cached from a previous session, or does the RSSI (signal strength) of keep getting updated when you are supposed to be in DFU mode?

RE: DFU mode and BLE

Roei — Fri, 21 Jan 2022 13:17:55 GMT

After the main app is connected, it set bootloader flag and reset itself. After that - bootloader is active and main app advertisement is active as well, according to the scanner

RE: DFU mode and BLE

Vidar Berg — Fri, 21 Jan 2022 12:51:26 GMT

No, it's not possible to see adv. from both app and bootloader. The device can only run one program at a time. If you see advertising from the application, then that indicates the the bootloader did not enter DFU mode.

Assume you see the bootloader advertising if you delete the app from your device?

RE: DFU mode and BLE

Roei — Fri, 21 Jan 2022 12:47:48 GMT

Thanks!

Is it possible that the scanner will see both advertisements at the same time? Main app and DFU app? Or main app advertisement while DFU is already connected?

RE: DFU mode and BLE

Vidar Berg — Fri, 21 Jan 2022 12:17:02 GMT

Hi,

Yes, this is expected if you're using the Bluetooth bootloader from the nRF5 SDK, but it should advertise with a different address and name compared to the application, see Buttonless Secure DFU Service without bonds for more details.

Best regards,

Vidar

RE: DFU mode and BLE

Roei — Thu, 20 Jan 2022 14:08:57 GMT

I will try to focus my question:

After reset my application to enter DFU mode, I can still see advertisement on my PC scanner.

Does it make sense?

Thanks!