How can I add an enable button to NCS BLE DFU?

RE: How can I add an enable button to NCS BLE DFU?

JY wu — Fri, 26 Jul 2024 09:12:36 GMT

Hi~

Got it, thank you very much!

RE: How can I add an enable button to NCS BLE DFU?

Menon — Fri, 26 Jul 2024 08:59:49 GMT

Hello,

I’m not entirely sure if I’ve understood your requirement correctly, but I’ll try to explain what I gather.

Implementing Button Control for DFU

Use one button to enable DFU mode (allow firmware updates via BLE).
Use another button to disable DFU mode (prevent firmware updates).
You are implementing this method to make a secure BLE OTA.

AFAIK, with the nRF Connect SDK and BLE DFU, the device does not enter a special DFU mode per se. Instead, the firmware must support DFU over BLE, which is based on the BLE Simple Management Protocol (SMP). The bootloader handles entering a specific mode that allows the device to accept firmware images from a mobile application or peripheral.

Therefore, you will likely need a combination of application logic and bootloader configuration.
- Use a specific flash address to store the DFU state.
- In the application code, handle button presses to update the DFU state.
- In the bootloader code, check the DFU state from flash before allowing a DFU request.

Note that implementing this method will involve updating the bootloader code, so you should consider the impact of each SDK update.

Kind regards,

Abhijith

RE: How can I add an enable button to NCS BLE DFU?

JY wu — Wed, 24 Jul 2024 14:22:39 GMT

Hi~

We had add our private Signature to our code.

The behavior of nrf connect device manager app is: still can connect, upload firmware, but always fails when upload finished.

The error message on nrf connect device manager is : Hash not found (8)

It looks like firmware with different signatures can't replace each other.

This solved security issue. But this solution is still buttonless.

Would you please tell me: Is it possible to add an enable button in SDK v2.6.1 ?

RE: How can I add an enable button to NCS BLE DFU?

Menon — Wed, 24 Jul 2024 13:51:07 GMT

Hello,

Please refer to the section on Signing the Sample Images and read about Adding a Custom Signature Key File with MCUboot as the bootloader. For a detailed explanation of image signing and encryption in MCUboot, you can review this repository.

Kind regards,

Abhijith