SDK 14: secure buttonless DFU

[gkovelman_tap]

I'm trying to integrate buttonless DFU with secure bootloader with bonds with the DFU. Using SDK 14 with SD 132 v5.0.0. Using projects: secure_dfu_ble, ble_app_hrs_freertos(modified with ble_app_buttonless_dfu)

Using the nRF connect for android, I can currently tell the embedded app to go to the BL, but the application does not continue with the DFU - it connects automatically to the embedded device in the BL mode (and sees the DFU services), but unable to continue there.

There's no error in the embedded size and app_error_handler_bare is not triggered.

However I'm seeing in the nRF connect's log that it's removing the bond information. Is that OK? Could be a reason that it's unable to proceed with the secure DFU. Then how can I test the DFU and when will the app be updated? If it is OK, what should I check?

Another note, in the secure_dfu_ble_s132 project, nrf_ble_dfu.c file, there's code that shouldn't be there:

            uint16_t cccd;
        ble_gatts_value_t value =
        {
            .len     = BLE_CCCD_VALUE_LEN,
            .offset  = 0,
            .p_value = (uint8_t*)&cccd
        };

        err_code = sd_ble_gatts_value_get(m_conn_handle, BLE_UUID_GATT_CHARACTERISTIC_SERVICE_CHANGED, &value);
        APP_ERROR_CHECK(err_code);

        NRF_LOG_DEBUG("CCCD for the service changed is 0x%04x", cccd);

in line 695. Was it added by mistake or should it be somewhere else?

Thanks in advance

[gkovelman_tap]

I was supposed to check the Keep bonding information in the DFU settings. Same thing applies to nRF Toolbox for Android.

iOS nRF connect also started the DFU process but it didn't finish gracefully - I had to rebond the device on the iPad. I'll investigate.

nrfutil v3.2.0 didn't start the DFU process at all. I couldn't find any setting for it to start a buttonless DFU.

[Hung Bui]

Hi,

You mean it worked now after you changed the setting in nRFToolbox on Android ? I suggest to test with nRFToolbox on iOS.

I don't think nrftutil supports buttonless ( and no bonding ).

[gkovelman_tap]

Yes, I changed the setting in nRF toolbox on Android. I wasn't aware of the nRFtoolbox for iOS at the time; I did the tests with nRF connect.

Too bad that the nrfutil doesn't support bonding and buttonless DFU.

[Hung Bui]

Did it work when testing with nRFToolbox on iOS ?

On PC, if you want to support bonding and buttonless, you may need to modify the nrftutil source and add your own code. Simply add option to switch from application to bootloader (no bond) should be fairly easy though.