Application service UUID gone after secure OTA DFU

[SK]

Hello, 

I am using nRF52832 on SES v4.12 with SDK v15.3 and SD v6.1.1 on a custom board.

Background: 

I want to perform OTA DFU and with that i have two services enabled (secure dfu buttonless and NUS). I was facing OTA DFU issue in which i was getting CRC does not match error. This has been resolved here - https://devzone.nordicsemi.com/f/nordic-q-a/55653/dfu-crc-does-not-match-error

So, i have been able to perform OTA update. 

The package that i created includes BL+SD+APP. 

Problem: 

Once i perform the update and connect again, i only see one service, which is Secure DFU service and the other which is the main application service ID (NUS) is gone. I looked in the forum and found this -https://devzone.nordicsemi.com/f/nordic-q-a/39982/after-ota-dfu-bootloader-application-gone

But i do not quite fully understand as to what is to be done here. Could you please highlight on what is required for a proper DFU process? From what i understand from the post and infocenter that it is still a single update, so BL+SD+APP merged together should work fine internally. 

EDIT:

Zip created has only application hex in it. BL+SD+APP is programmed directly using nrfjprog. 

Please let me know if you require more information. 

Thanks a lot!

-SK

[SK]

Okay, tried doing OTA DFU. Still not working. 

Error 0x85 - GATT Error. Before this happens, device resets. 

[SK]

logs from the bootloader as i try to do DFU

<debug> app: In nrf_bootloader_init

<debug> nrf_dfu_settings: Calling nrf_dfu_settings_init()...

<debug> nrf_dfu_flash: Initializing nrf_fstorage_nvmc backend.

<debug> nrf_dfu_settings: Using settings page.

<debug> nrf_dfu_settings: Copying forbidden parts from backup page.

<debug> nrf_dfu_settings: Destination settings are identical to source, write not needed. Skipping.

<info> nrf_dfu_settings: Backing up settings page to address 0x7E000.

<debug> nrf_dfu_settings: Destination settings are identical to source, write not needed. Skipping.

<debug> app: Enter nrf_bootloader_fw_activate

<info> app: No firmware to activate.

<debug> app: App is valid

<info> nrf_dfu_settings: Backing up settings page to address 0x7E000.

<debug> nrf_dfu_settings: Destination settings are identical to source, write not needed. Skipping.

<debug> app: Running nrf_bootloader_app_start with address: 0x00001000

<debug> app: Disabling interrupts. NVIC->ICER[0]: 0x0

<debug> app: In nrf_bootloader_init

<debug> nrf_dfu_settings: Calling nrf_dfu_settings_init()...

<debug> nrf_dfu_flash: Initializing nrf_fstorage_nvmc backend.

<debug> nrf_dfu_settings: Using settings page.

<debug> nrf_dfu_settings: Copying forbidden parts from backup page.

<debug> nrf_dfu_settings: Destination settings are identical to source, write not needed. Skipping.

<info> nrf_dfu_settings: Backing up settings page to address 0x7E000.

<debug> nrf_dfu_settings: Destination settings are identical to source, write not needed. Skipping.

<debug> app: Enter nrf_bootloader_fw_activate

<info> app: No firmware to activate.

<debug> app: App is valid

<info> nrf_dfu_settings: Backing up settings page to address 0x7E000.

<debug> nrf_dfu_settings: Destination settings are identical to source, write not needed. Skipping.

<debug> app: Running nrf_bootloader_app_start with address: 0x00001000

<debug> app: Disabling interrupts. NVIC->ICER[0]: 0x0

<debug> app: In nrf_bootloader_init

<debug> nrf_dfu_settings: Calling nrf_dfu_settings_init()...

<debug> nrf_dfu_flash: Initializing nrf_fstorage_nvmc backend.

<debug> nrf_dfu_settings: Using settings page.

<debug> nrf_dfu_settings: Copying forbidden parts from backup page.

<debug> nrf_dfu_settings: Destination settings are identical to source, write not needed. Skipping.

<info> nrf_dfu_settings: Backing up settings page to address 0x7E000.

<debug> nrf_dfu_settings: Writing settings...

<debug> nrf_dfu_settings: Erasing old settings at: 0x0007E000

<debug> nrf_dfu_flash: nrf_fstorage_erase(addr=0x0x0007E000, len=1 pages), queue usage: 0

<debug> nrf_dfu_flash: Flash erase success: addr=0x0007E000, pending 0

<debug> nrf_dfu_flash: nrf_fstorage_write(addr=0x0007E000, src=0x20005DE4, len=896 bytes), queue usage: 1

<debug> nrf_dfu_flash: Flash write success: addr=0x0007E000, pending 0

<debug> app: Enter nrf_bootloader_fw_activate

<info> app: No firmware to activate.

<debug> app: App is valid

<debug> app: DFU mode requested via GPREGRET.

<info> nrf_bootloader_wdt: WDT is not enabled

<debug> app: in weak nrf_dfu_init_user

<debug> app: timer_stop (0x200057D8)

<debug> app: timer_activate (0x200057D8)

<info> app: Entering DFU mode.

<debug> app: Initializing transports (found: 1)

<debug> nrf_dfu_ble: Initializing BLE DFU transport

<debug> nrf_dfu_ble: Setting up vector table: 0x00072000

<debug> nrf_dfu_ble: Enabling SoftDevice.

<debug> nrf_dfu_ble: Configuring BLE stack.

<debug> nrf_dfu_ble: Enabling the BLE stack.

<debug> nrf_dfu_ble: Copying peer data

<debug> nrf_dfu_ble: Using default advertising name

<debug> nrf_dfu_ble: Advertising...

<debug> nrf_dfu_ble: BLE DFU transport initialized.

<debug> nrf_dfu_flash: Initializing nrf_fstorage_sd backend.

<debug> app: Enter main loop

<debug> nrf_dfu_ble: Connected

<debug> nrf_dfu_ble: Received BLE_GAP_EVT_CONN_PARAM_UPDATE

<debug> nrf_dfu_ble: max_conn_interval: 12

<debug> nrf_dfu_ble: min_conn_interval: 12

<debug> nrf_dfu_ble: slave_latency: 0

<debug> nrf_dfu_ble: conn_sup_timeout: 600

<debug> nrf_dfu_ble: Received BLE_GAP_EVT_SEC_INFO_REQUEST

<debug> nrf_dfu_ble: Sending Service Changed indication

<debug> nrf_dfu_ble: Finished handling conn sec update

<debug> nrf_dfu_ble: Received BLE_GAP_EVT_CONN_PARAM_UPDATE

<debug> nrf_dfu_ble: max_conn_interval: 6

<debug> nrf_dfu_ble: min_conn_interval: 6

<debug> nrf_dfu_ble: slave_latency: 0

<debug> nrf_dfu_ble: conn_sup_timeout: 500

<debug> nrf_dfu_ble: Received BLE_GAP_EVT_CONN_PARAM_UPDATE

<debug> nrf_dfu_ble: max_conn_interval: 12

<debug> nrf_dfu_ble: min_conn_interval: 12

<debug> nrf_dfu_ble: slave_latency: 0

<debug> nrf_dfu_ble: conn_sup_timeout: 600

<debug> nrf_dfu_ble: Received BLE_GATTS_EVT_EXCHANGE_MTU_REQUEST (request: 517, reply: 247).

<debug> nrf_dfu_ble: Received BLE_GAP_EVT_DATA_LENGTH_UPDATE_REQUEST.

<debug> nrf_dfu_ble: Received BLE_GAP_EVT_DATA_LENGTH_UPDATE (251, max_rx_time 2120).

<debug> app: In nrf_bootloader_init

<debug> nrf_dfu_settings: Calling nrf_dfu_settings_init()...

<debug> nrf_dfu_flash: Initializing nrf_fstorage_nvmc backend.

<debug> nrf_dfu_settings: Using settings page.

<debug> nrf_dfu_settings: Copying forbidden parts from backup page.

<debug> nrf_dfu_settings: Destination settings are identical to source, write not needed. Skipping.

<info> nrf_dfu_settings: Backing up settings page to address 0x7E000.

<debug> nrf_dfu_settings: Destination settings are identical to source, write not needed. Skipping.

<debug> app: Enter nrf_bootloader_fw_activate

<info> app: No firmware to activate.

<debug> app: App is valid

<debug> nrf_dfu_settings_svci: Erasing settings page additional data.

<info> nrf_dfu_settings: Backing up settings page to address 0x7E000.

<debug> nrf_dfu_settings: Writing settings...

<debug> nrf_dfu_settings: Erasing old settings at: 0x0007E000

<debug> nrf_dfu_flash: nrf_fstorage_erase(addr=0x0x0007E000, len=1 pages), queue usage: 0

<debug> nrf_dfu_flash: Flash erase success: addr=0x0007E000, pending 0

<debug> nrf_dfu_flash: nrf_fstorage_write(addr=0x0007E000, src=0x20005DE4, len=896 bytes), queue usage: 1

<debug> nrf_dfu_flash: Flash write success: addr=0x0007E000, pending 0

<debug> app: Running nrf_bootloader_app_start with address: 0x00001000

<debug> app: Disabling interrupts. NVIC->ICER[0]: 0x0

[SK]

Okay so i noticed that for the previous SDK 14.2 i used inactivity timer value as 10000. 

Increasing the value to 120000 as was default, i did not see any GATT error while doing OTA DFU.