Bonding randomly loss after DFU

[Moh]

Hi there,

I am using nrf connect sdk v2.6.0. I have noticed that after DFU update, I am seeing ble bonding lost randomly on firmware side. I did uncheck Erase Application Settings before DFU and I tried on both Device Manager app as well as nrf connect app and on both Android/IOS. I am attaching dts snippet and prj.conf for reference.

Thanks M

&flash0 {

	partitions {
		compatible = "fixed-partitions";
		#address-cells = <1>;
		#size-cells = <1>;

		boot_partition: partition@0 {
			label = "mcuboot";
			reg = <0x00000000 0x0000C000>;
		};
		slot0_partition: partition@c000 {
			label = "image-0";
			reg = <0x0000C000 0x00076000>;
		};
		slot1_partition: partition@82000 {
			label = "image-1";
			reg = <0x00082000 0x00076000>;
		};

		/*
		 * The flash starting at 0x000f8000 and ending at
		 * 0x000fffff is reserved for use by the application.
		 */

		/*
		 * Storage partition will be used by FCB/LittleFS/NVS
		 * if enabled.
		 */

		app_storage_partition: partition@f8000 {
			label = "appstorage";
			reg = <0x000f8000 0x00006000>;
		};
		storage_partition: partition@fe000 {
			label = "storage";
			reg = <0x000fe000 0x00002000>;
		};
	};
};

6786.prj.conf

[Amanda Hsieh]

Hi, 

I am seeing ble bonding lost randomly on firmware side.

Did you add the related codes as this course https://academy.nordicsemi.com/courses/bluetooth-low-energy-fundamentals/lessons/lesson-5-bluetooth-le-security-fundamentals/topic/blefund-lesson-5-exercise-2/?

I did uncheck Erase Application Settings before DFU and I tried on both Device Manager app as well as nrf connect app and on both Android/IOS.

Did you check if the "Erase application settings" is disabled every time?

Regards,
Amanda H.

[Moh]

Hi Amanda,

Yes I did and I did uncheck "Erase application settings" everytime in the app before DFU.

Regards,
M

[Amanda Hsieh]

Could you remove the partition in dts and let the partition manager automatically generate it to see it can help or not?

[Moh]

Hi , If I remove from dts, It doesn't get build. FYI I do have static partition defined too. 

app:
  address: 0xc200
  end_address: 0xfe000
  region: flash_primary
  size: 0xf1e00
external_flash:
  address: 0xf2000
  end_address: 0x400000
  region: external_flash
  size: 0x30e000
mcuboot:
  address: 0x0
  end_address: 0xc000
  placement:
    before:
      - mcuboot_primary
  region: flash_primary
  size: 0xc000
mcuboot_pad:
  address: 0xc000
  end_address: 0xc200
  placement:
    align:
      start: 0x1000
    before:
      - mcuboot_primary_app
  region: flash_primary
  size: 0x200
mcuboot_primary:
  address: 0xc000
  end_address: 0xfe000
  orig_span: &id001
    - app
    - mcuboot_pad
  region: flash_primary
  size: 0xf2000
  span: *id001
mcuboot_primary_app:
  address: 0xc200
  end_address: 0xfe000
  orig_span: &id002
    - app
  region: flash_primary
  size: 0xf1e00
  span: *id002
mcuboot_secondary:
  address: 0x0
  device: DT_CHOSEN(nordic_pm_ext_flash)
  end_address: 0xf2000
  placement:
    align:
      start: 0x4
  region: external_flash
  share_size:
    - mcuboot_primary
  size: 0xf2000
app_storage_partition:
  address: 0xf8000
  end_address: 0xfc000
  region: flash_primary
  size: 0x6000
settings_storage:
  address: 0xfe000
  end_address: 0x100000
  placement:
    align:
      start: 0x1000
    before:
      - end
  region: flash_primary
  size: 0x2000
sram_primary:
  address: 0x20000000
  end_address: 0x20040000
  region: sram_primary
  size: 0x40000