RE: Issue with OTA Application Update on nRF52840 DK Board

Einar Thorsrud — Fri, 16 May 2025 13:13:01 GMT

Hi,

I see that there are disconnects that seem unexpected (the bootloader does not log disconnecds direclty, but logs when advertising is restarted with "Advertising..."). I do not see any obvious errors before that, other than unusual high number of BLE_GAP_EVT_CONN_PARAM_UPDATE in close proximity.

Which Android device (model and software version) are you using? Are you able to reproduce this behaviour with other devices, or just this one? Do other devices succeed? It could also be interesting with a sniffer trace to see what actually happens on air (you can use the nRF Sniffer for Bluetooth LE for that).

RE: Issue with OTA Application Update on nRF52840 DK Board

Clarity — Thu, 15 May 2025 05:46:40 GMT

00> <info> app: Inside main
00>
00> <debug> app: In nrf_bootloader_init
00>
00> <debug> nrf_dfu_settings: Calling nrf_dfu_settings_init()...
00>
00> <debug> nrf_dfu_flash: Initializing nrf_fstorage_nvmc backend.
00>
00> <debug> nrf_dfu_settings: Using settings page.
00>
00> <debug> nrf_dfu_settings: Copying forbidden parts from backup page.
00>
00> <debug> nrf_dfu_settings: Destination settings are identical to source, write not needed. Skipping.
00>
00> <info> nrf_dfu_settings: Backing up settings page to address 0xFE000.
00>
00> <debug> nrf_dfu_settings: Destination settings are identical to source, write not needed. Skipping.
00>
00> <debug> app: Enter nrf_bootloader_fw_activate
00>
00> <info> app: No firmware to activate.
00>
00> <info> app: Boot validation failed. No valid app to boot.
00>
00> <debug> app: DFU mode because app is not valid.
00>
00> <info> nrf_bootloader_wdt: WDT is not enabled
00>
00> <debug> app: in weak nrf_dfu_init_user
00>
00> <debug> app: timer_stop (0x20005994)
00>
00> <debug> app: timer_activate (0x20005994)
00>
00> <info> app: Entering DFU mode.
00>
00> <debug> app: Initializing transports (found: 1)
00>
00> <debug> nrf_dfu_ble: Initializing BLE DFU transport
00>
00> <debug> nrf_dfu_ble: Setting up vector table: 0x000F1000
00>
00> <debug> nrf_dfu_ble: Enabling SoftDevice.
00>
00> <debug> nrf_dfu_ble: Configuring BLE stack.
00>
00> <debug> nrf_dfu_ble: Enabling the BLE stack.
00>
00> <debug> nrf_dfu_ble: No advertising name found
00>
00> <debug> nrf_dfu_ble: Using default advertising name
00>
00> <debug> nrf_dfu_ble: Advertising...
00>
00> <debug> nrf_dfu_ble: BLE DFU transport initialized.
00>
00> <debug> nrf_dfu_flash: Initializing nrf_fstorage_sd backend.
00>
00> <debug> app: Enter main loop
00>
00> <debug> nrf_dfu_ble: Connected
00>
00> <debug> nrf_dfu_ble: Received BLE_GAP_EVT_DATA_LENGTH_UPDATE_REQUEST.
00>
00> <debug> nrf_dfu_ble: Received BLE_GAP_EVT_DATA_LENGTH_UPDATE (27, max_rx_time 328).
00>
00> <debug> nrf_dfu_ble: Received BLE_GAP_EVT_CONN_PARAM_UPDATE
00>
00> <debug> nrf_dfu_ble: max_conn_interval: 12
00>
00> <debug> nrf_dfu_ble: min_conn_interval: 12
00>
00> <debug> nrf_dfu_ble: slave_latency: 0
00>
00> <debug> nrf_dfu_ble: conn_sup_timeout: 600
00>
00> <debug> nrf_dfu_ble: Received BLE_GAP_EVT_CONN_PARAM_UPDATE
00>
00> <debug> nrf_dfu_ble: max_conn_interval: 6
00>
00> <debug> nrf_dfu_ble: min_conn_interval: 6
00>
00> <debug> nrf_dfu_ble: slave_latency: 0
00>
00> <debug> nrf_dfu_ble: conn_sup_timeout: 500
00>
00> <debug> nrf_dfu_ble: Received BLE_GAP_EVT_CONN_PARAM_UPDATE
00>
00> <debug> nrf_dfu_ble: max_conn_interval: 12
00>
00> <debug> nrf_dfu_ble: min_conn_interval: 12
00>
00> <debug> nrf_dfu_ble: slave_latency: 0
00>
00> <debug> nrf_dfu_ble: conn_sup_timeout: 600
00>
00> <debug> nrf_dfu_ble: Received BLE_GATTS_EVT_EXCHANGE_MTU_REQUEST (request: 517, reply: 247).
00>
00> <debug> nrf_dfu_ble: Received BLE_GAP_EVT_DATA_LENGTH_UPDATE_REQUEST.
00>
00> <debug> nrf_dfu_ble: Received BLE_GAP_EVT_DATA_LENGTH_UPDATE (27, max_rx_time 328).
00>
00> <debug> nrf_dfu_req_handler: Handle NRF_DFU_OP_OBJECT_SELECT (command)
00>
00> <debug> nrf_dfu_req_handler: Request handling complete. Result: 0x1
00>
00> <debug> nrf_dfu_ble: Set receipt notif
00>
00> <debug> nrf_dfu_req_handler: Handle NRF_DFU_OP_RECEIPT_NOTIF_SET
00>
00> <debug> nrf_dfu_req_handler: Request handling complete. Result: 0x1
00>
00> <debug> app: Shutting down transports (found: 1)
00>
00> <debug> nrf_dfu_req_handler: Handle NRF_DFU_OP_OBJECT_CREATE (command)
00>
00> <debug> app: timer_stop (0x20005994)
00>
00> <debug> app: timer_activate (0x20005994)
00>
00> <debug> nrf_dfu_req_handler: Request handling complete. Result: 0x1
00>
00> <debug> nrf_dfu_ble: Received BLE_GAP_EVT_CONN_PARAM_UPDATE
00>
00> <debug> nrf_dfu_ble: max_conn_interval: 12
00>
00> <debug> nrf_dfu_ble: min_conn_interval: 12
00>
00> <debug> nrf_dfu_ble: slave_latency: 0
00>
00> <debug> nrf_dfu_ble: conn_sup_timeout: 500
00>
00> <debug> nrf_dfu_ble: Advertising...
00>
00> <debug> nrf_dfu_settings: Using settings page.
00>
00> <debug> nrf_dfu_settings: Copying forbidden parts from backup page.
00>
00> <debug> nrf_dfu_ble: Connected
00>
00> <debug> nrf_dfu_ble: Received BLE_GAP_EVT_DATA_LENGTH_UPDATE_REQUEST.
00>
00> <debug> nrf_dfu_ble: Received BLE_GAP_EVT_DATA_LENGTH_UPDATE (27, max_rx_time 328).
00>
00> <debug> nrf_dfu_ble: Received BLE_GAP_EVT_CONN_PARAM_UPDATE
00>
00> <debug> nrf_dfu_ble: max_conn_interval: 12
00>
00> <debug> nrf_dfu_ble: min_conn_interval: 12
00>
00> <debug> nrf_dfu_ble: slave_latency: 0
00>
00> <debug> nrf_dfu_ble: conn_sup_timeout: 600
00>
00> <debug> nrf_dfu_ble: Received BLE_GAP_EVT_CONN_PARAM_UPDATE
00>
00> <debug> nrf_dfu_ble: max_conn_interval: 6
00>
00> <debug> nrf_dfu_ble: min_conn_interval: 6
00>
00> <debug> nrf_dfu_ble: slave_latency: 0
00>
00> <debug> nrf_dfu_ble: conn_sup_timeout: 500
00>
00> <debug> nrf_dfu_ble: Received BLE_GAP_EVT_CONN_PARAM_UPDATE
00>
00> <debug> nrf_dfu_ble: max_conn_interval: 12
00>
00> <debug> nrf_dfu_ble: min_conn_interval: 12
00>
00> <debug> nrf_dfu_ble: slave_latency: 0
00>
00> <debug> nrf_dfu_ble: conn_sup_timeout: 600
00>
00> <debug> app: timer_stop (0x20005994)
00>
00> <debug> app: tim<info> app: Inside main
00>
00> <debug> app: In nrf_bootloader_init
00>
00> <debug> nrf_dfu_settings: Calling nrf_dfu_settings_init()...
00>
00> <debug> nrf_dfu_flash: Initializing nrf_fstorage_nvmc backend.
00>
00> <debug> nrf_dfu_settings: Using settings page.
00>
00> <debug> nrf_dfu_settings: Copying forbidden parts from backup page.
00>
00> <debug> nrf_dfu_settings: Destination settings are identical to source, write not needed. Skipping.
00>
00> <info> nrf_dfu_settings: Backing up settings page to address 0xFE000.
00>
00> <debug> nrf_dfu_settings: Destination settings are identical to source, write not needed. Skipping.
00>
00> <debug> app: Enter nrf_bootloader_fw_activate
00>
00> <info> app: No firmware to activate.
00>
00> <info> app: Boot validation failed. No valid app to boot.
00>
00> <debug> app: DFU mode because app is not valid.
00>
00> <info> nrf_bootloader_wdt: WDT is not enabled
00>
00> <debug> app: in weak nrf_dfu_init_user
00>
00> <debug> app: timer_stop (0x20005994)
00>
00> <debug> app: timer_activate (0x20005994)
00>
00> <info> app: Entering DFU mode.
00>
00> <debug> app: Initializing transports (found: 1)
00>
00> <debug> nrf_dfu_ble: Initializing BLE DFU transport
00>
00> <debug> nrf_dfu_ble: Setting up vector table: 0x000F1000
00>
00> <debug> nrf_dfu_ble: Enabling SoftDevice.
00>
00> <debug> nrf_dfu_ble: Configuring BLE stack.
00>
00> <debug> nrf_dfu_ble: Enabling the BLE stack.
00>
00> <debug> nrf_dfu_ble: No advertising name found
00>
00> <debug> nrf_dfu_ble: Using default advertising name
00>
00> <debug> nrf_dfu_ble: Advertising...
00>
00> <debug> nrf_dfu_ble: BLE DFU transport initialized.
00>
00> <debug> nrf_dfu_flash: Initializing nrf_fstorage_sd backend.
00>
00> <debug> app: Enter main loop
00>
00> <debug> app: timer_stop (0x20005994)
00>
00> <debug> app: timer_fire (0x20005<info> app: Inside main
00>
00> <debug> app: In nrf_bootloader_init
00>
00> <debug> nrf_dfu_settings: Calling nrf_dfu_settings_init()...
00>
00> <debug> nrf_dfu_flash: Initializing nrf_fstorage_nvmc backend.
00>
00> <debug> nrf_dfu_settings: Using settings page.
00>
00> <debug> nrf_dfu_settings: Copying forbidden parts from backup page.
00>
00> <debug> nrf_dfu_settings: Destination settings are identical to source, write not needed. Skipping.
00>
00> <info> nrf_dfu_settings: Backing up settings page to address 0xFE000.
00>
00> <debug> nrf_dfu_settings: Destination settings are identical to source, write not needed. Skipping.
00>
00> <debug> app: Enter nrf_bootloader_fw_activate
00>
00> <info> app: No firmware to activate.
00>
00> <info> app: Boot validation failed. No valid app to boot.
00>
00> <debug> app: DFU mode because app is not valid.
00>
00> <info> nrf_bootloader_wdt: WDT is not enabled
00>
00> <debug> app: in weak nrf_dfu_init_user
00>
00> <debug> app: timer_stop (0x20005994)
00>
00> <debug> app: timer_activate (0x20005994)
00>
00> <info> app: Entering DFU mode.
00>
00> <debug> app: Initializing transports (found: 1)
00>
00> <debug> nrf_dfu_ble: Initializing BLE DFU transport
00>
00> <debug> nrf_dfu_ble: Setting up vector table: 0x000F1000
00>
00> <debug> nrf_dfu_ble: Enabling SoftDevice.
00>
00> <debug> nrf_dfu_ble: Configuring BLE stack.
00>
00> <debug> nrf_dfu_ble: Enabling the BLE stack.
00>
00> <debug> nrf_dfu_ble: No advertising name found
00>
00> <debug> nrf_dfu_ble: Using default advertising name
00>
00> <debug> nrf_dfu_ble: Advertising...
00>
00> <debug> nrf_dfu_ble: BLE DFU transport initialized.
00>
00> <debug> nrf_dfu_flash: Initializing nrf_fstorage_sd backend.
00>
00> <debug> app: Enter main loop
00>

RE: Issue with OTA Application Update on nRF52840 DK Board

Clarity — Thu, 15 May 2025 04:47:53 GMT

RE: Issue with OTA Application Update on nRF52840 DK Board

Einar Thorsrud — Wed, 14 May 2025 14:07:21 GMT

Hi,

Can you build a debug version of the bootloader (use the example project suffixed _debug) and check the RTT log? Can you share the log here? That will often give good information about any bootloader issues.