Secure Bootloader Version from App

[Roiger]

Hi!
Some prerequisite info:

• We are using nrf52840 boards as our peripherals
• We are using v16.0.0 SDK
• We are using the s113 SoftDevice, more specifically s113_nrf52_7.0.1_softdevice.
• Since our central code is written in .NET Core, we use Windows.Devices.Bluetooth to take care of the PC side of the bluetooth.

Now onto my question:

We want to know at the application level what our current bootloader version is, to be able to know if we need to update it or not (OTA).
Is this possible? Can the app request the bootloader version, even though they are not on the same address space?
Followup- if this is possible, can the value be shown as a characteristic?

Thanks!

Roi

[run_ar]

Hi,

The bootloader version can be fetched from the Bootloader Settings page

If you are using buttonless DFU you can probably add a custom opp code to the control point characteristic and use that to read the version. ble_dfu_buttonless_op_code_t

[Roiger]

Regarding the settings page- is this the settings file that is generated (in my case, using nrfutil) before the first programming of the device?

If so, bootloader version is given using a flag there- it wont necessarily be the "true" bootloader version (according to the C code).

Many thanks for the quick reply!

Roi

[Sigurd]

Roiger said:

Regarding the settings page- is this the settings file that is generated (in my case, using nrfutil) before the first programming of the device?

 Yes.

Roiger said:

If so, bootloader version is given using a flag there- it wont necessarily be the "true" bootloader version (according to the C code).

 The settings page - bootloader version field will be updated when you do a DFU.

I think you can read the bootloader version from the app itself like this:

     nrf_dfu_settings_t my_dfu_settings;
     memcpy(&my_dfu_settings, (uint32_t *)BOOTLOADER_SETTINGS_ADDRESS, sizeof(nrf_dfu_settings_t)); 

     uint32_t my_bootloader_version = my_dfu_settings.bootloader_version;

[Roiger]

Very helpful Sigurd! Many Thanks!