Bonbed OTA DFU with nrfutil

[roland.schenk]

Hello,

I'm using the buttonless DFU bootloader examples with bonding and the PC nrfutil with a nRF52840 PDK for the firmware upload.

If I try to start the DFU process a second time with the same targed device, the connection will be refused with an error.

The problem is that the pairing/bonding keys (IRK, LTK, ...) are stored in the Flash of the targed device by the peer manager. But on the PC side the nrfutil tool doesn't save the pairing/bonding keys (IRK, LTK, ...) and tries to perform a new pairing/bonding at each connect to the same targed device. This will be refused by the targed device, because there are already pairing/bonding keys (IRK, LTK, ...) stored from the previous pairing/bonding with this PC.

Is there a solution to store pairing/bonding informations on the PC using nrfutil? Or is there a possibility to solve this problem in another way?

Best regards

Roland

[run_ar]

Hi,

Unfortunately, it is not possible to store bond information across sessions in nrfutil or nrfconnect. You could use nrfconnect as that will keep the bond information for the current sessions.

An alternative is to modify the peer manager so it allows bond refresh in the application. (But please not that this is also a security issue as other device could use the same address as a previously bonded peer to get a new bond). Change the below code to true, instead of false to enable this feature (will only work in the application, not the bootloader).

        case PM_EVT_CONN_SEC_CONFIG_REQ:
        {
            // Reject pairing request from an already bonded peer.
            pm_conn_sec_config_t conn_sec_config = {.allow_repairing = false};

 

[roland.schenk]

Hi,

I tried pm_conn_sec_config_t conn_sec_config = {.allow_repairing = true};

With nRF Connect this is working fine, but with nrfutil it doesn't work. At the 2nd upload to the same bonded target device I get the following error output (It looks to be the same as with allow_repairing = false):

nrfutil -v dfu ble -ic NRF52 -pkg .\_build\nrf52840_xxaa.zip -n "SP_1257304283" -f
Please select connectivity serial port:
        0 : COM4 - 680825448
        1 : COM5 - 683703628
        2 : COM7 - 683757419
Enter your choice: : 2
Board already flashed with connectivity firmware.
  [------------------------------------]    0%2018-08-29 13:27:20,512 Exception: UUID not found
2018-08-29 13:27:20,516 ('c:\\python27\\lib\\site-packages\\pc_ble_driver_py\\ble_driver.py', 1483, 'sync_ble_evt_handler', 'data           = util.uint8_array_t
o_list(hvx_evt.data, hvx_evt.len))')
2018-08-29 13:27:20,516 ('c:\\python27\\lib\\site-packages\\wrapt\\wrappers.py', 562, '__call__', 'args, kwargs)')
2018-08-29 13:27:20,517 ('c:\\python27\\lib\\site-packages\\wrapt\\decorators.py', 440, '_synchronized', 'return wrapped(*args, **kwargs)')
2018-08-29 13:27:20,517 ('c:\\python27\\lib\\site-packages\\pc_ble_driver_py\\ble_adapter.py', 486, 'on_gattc_evt_hvx', "raise NordicSemiException('UUID not fou
nd')")
2018-08-29 13:27:20,519

Traceback (most recent call last):
  File "C:\Python27\Scripts\nrfutil-script.py", line 11, in <module>
    load_entry_point('nrfutil==3.5.1', 'console_scripts', 'nrfutil')()
  File "c:\python27\lib\site-packages\click\core.py", line 722, in __call__
    return self.main(*args, **kwargs)
  File "c:\python27\lib\site-packages\click\core.py", line 697, in main
    rv = self.invoke(ctx)
  File "c:\python27\lib\site-packages\click\core.py", line 1066, in invoke
    return _process_result(sub_ctx.command.invoke(sub_ctx))
  File "c:\python27\lib\site-packages\click\core.py", line 1066, in invoke
    return _process_result(sub_ctx.command.invoke(sub_ctx))
  File "c:\python27\lib\site-packages\click\core.py", line 895, in invoke
    return ctx.invoke(self.callback, **ctx.params)
  File "c:\python27\lib\site-packages\click\core.py", line 535, in invoke
    return callback(*args, **kwargs)
  File "c:\python27\lib\site-packages\nordicsemi\__main__.py", line 838, in ble
    dfu.dfu_send_images()
  File "c:\python27\lib\site-packages\nordicsemi\dfu\dfu.py", line 129, in dfu_send_images
    self._dfu_send_image(self.manifest.application)
  File "c:\python27\lib\site-packages\nordicsemi\dfu\dfu.py", line 90, in _dfu_send_image
    self.dfu_transport.open()
  File "c:\python27\lib\site-packages\nordicsemi\dfu\dfu_transport_ble.py", line 453, in open
    target_device_addr = self.target_device_addr)
  File "c:\python27\lib\site-packages\nordicsemi\dfu\dfu_transport_ble.py", line 153, in connect
    self.jump_from_buttonless_mode_to_bootloader(DFUAdapter.BLE_DFU_BUTTONLESS_BONDED_CHAR_UUID)
  File "c:\python27\lib\site-packages\nordicsemi\dfu\dfu_transport_ble.py", line 196, in jump_from_buttonless_mode_to_bootloader
    response = self.indication_q.get(timeout=DfuTransportBle.DEFAULT_TIMEOUT)
  File "c:\python27\lib\Queue.py", line 176, in get
    raise Empty
Queue.Empty

What could be the reason that it doesn't work with nrfutil?

Best regards

Roland

[roland.schenk]

Hi,

The error output form nrfutil with allow_repairing = false is different:

nrfutil -v dfu ble -ic NRF52 -pkg .\_build\nrf52840_xxaa.zip -n "SP_1257304283" -f
Please select connectivity serial port:
        0 : COM4 - 680825448
        1 : COM5 - 683703628
        2 : COM7 - 683757419
Enter your choice: : 2
Board already flashed with connectivity firmware.
  [------------------------------------]    0%2018-08-29 14:01:17,878 Exception: UUID not found
2018-08-29 14:01:17,884 ('c:\\python27\\lib\\site-packages\\pc_ble_driver_py\\ble_driver.py', 1483, 'sync_ble_evt_handler', 'data           = util.uint8_array_t
o_list(hvx_evt.data, hvx_evt.len))')
2018-08-29 14:01:17,884 ('c:\\python27\\lib\\site-packages\\wrapt\\wrappers.py', 562, '__call__', 'args, kwargs)')
2018-08-29 14:01:17,884 ('c:\\python27\\lib\\site-packages\\wrapt\\decorators.py', 440, '_synchronized', 'return wrapped(*args, **kwargs)')
2018-08-29 14:01:17,884 ('c:\\python27\\lib\\site-packages\\pc_ble_driver_py\\ble_adapter.py', 486, 'on_gattc_evt_hvx', "raise NordicSemiException('UUID not fou
nd')")
2018-08-29 14:01:17,885

Traceback (most recent call last):
  File "C:\Python27\Scripts\nrfutil-script.py", line 11, in <module>
    load_entry_point('nrfutil==3.5.1', 'console_scripts', 'nrfutil')()
  File "c:\python27\lib\site-packages\click\core.py", line 722, in __call__
    return self.main(*args, **kwargs)
  File "c:\python27\lib\site-packages\click\core.py", line 697, in main
    rv = self.invoke(ctx)
  File "c:\python27\lib\site-packages\click\core.py", line 1066, in invoke
    return _process_result(sub_ctx.command.invoke(sub_ctx))
  File "c:\python27\lib\site-packages\click\core.py", line 1066, in invoke
    return _process_result(sub_ctx.command.invoke(sub_ctx))
  File "c:\python27\lib\site-packages\click\core.py", line 895, in invoke
    return ctx.invoke(self.callback, **ctx.params)
  File "c:\python27\lib\site-packages\click\core.py", line 535, in invoke
    return callback(*args, **kwargs)
  File "c:\python27\lib\site-packages\nordicsemi\__main__.py", line 838, in ble
    dfu.dfu_send_images()
  File "c:\python27\lib\site-packages\nordicsemi\dfu\dfu.py", line 129, in dfu_send_images
    self._dfu_send_image(self.manifest.application)
  File "c:\python27\lib\site-packages\nordicsemi\dfu\dfu.py", line 90, in _dfu_send_image
    self.dfu_transport.open()
  File "c:\python27\lib\site-packages\nordicsemi\dfu\dfu_transport_ble.py", line 453, in open
    target_device_addr = self.target_device_addr)
  File "c:\python27\lib\site-packages\nordicsemi\dfu\dfu_transport_ble.py", line 153, in connect
    self.jump_from_buttonless_mode_to_bootloader(DFUAdapter.BLE_DFU_BUTTONLESS_BONDED_CHAR_UUID)
  File "c:\python27\lib\site-packages\nordicsemi\dfu\dfu_transport_ble.py", line 181, in jump_from_buttonless_mode_to_bootloader
    self.bond()
  File "c:\python27\lib\site-packages\nordicsemi\dfu\dfu_transport_ble.py", line 312, in bond
    None)
  File "c:\python27\lib\site-packages\wrapt\wrappers.py", line 562, in __call__
    args, kwargs)
  File "c:\python27\lib\site-packages\pc_ble_driver_py\ble_driver.py", line 126, in wrapper
    raise NordicSemiException('Failed to {}. Error code: {}'.format(wrapped.__name__, err_code))
pc_ble_driver_py.exceptions.NordicSemiException: Failed to ble_gap_sec_params_reply. Error code: 8

[roland.schenk]

Hi,

I have still the problem, that nrfutil chrashes with pm_conn_sec_config_t conn_sec_config = {.allow_repairing = true}; in the application.

nrfutil -v dfu ble -ic NRF52 -pkg .\_build\nrf52840_xxaa.zip -n "SP_1257304283" -f
Please select connectivity serial port:
        0 : COM4 - 680825448
        1 : COM5 - 683703628
        2 : COM7 - 683757419
Enter your choice: : 2
Board already flashed with connectivity firmware.
  [------------------------------------]    0%2018-08-29 13:27:20,512 Exception: UUID not found
2018-08-29 13:27:20,516 ('c:\\python27\\lib\\site-packages\\pc_ble_driver_py\\ble_driver.py', 1483, 'sync_ble_evt_handler', 'data           = util.uint8_array_t
o_list(hvx_evt.data, hvx_evt.len))')
2018-08-29 13:27:20,516 ('c:\\python27\\lib\\site-packages\\wrapt\\wrappers.py', 562, '__call__', 'args, kwargs)')
2018-08-29 13:27:20,517 ('c:\\python27\\lib\\site-packages\\wrapt\\decorators.py', 440, '_synchronized', 'return wrapped(*args, **kwargs)')
2018-08-29 13:27:20,517 ('c:\\python27\\lib\\site-packages\\pc_ble_driver_py\\ble_adapter.py', 486, 'on_gattc_evt_hvx', "raise NordicSemiException('UUID not fou
nd')")
2018-08-29 13:27:20,519

Traceback (most recent call last):
  File "C:\Python27\Scripts\nrfutil-script.py", line 11, in <module>
    load_entry_point('nrfutil==3.5.1', 'console_scripts', 'nrfutil')()
  File "c:\python27\lib\site-packages\click\core.py", line 722, in __call__
    return self.main(*args, **kwargs)
  File "c:\python27\lib\site-packages\click\core.py", line 697, in main
    rv = self.invoke(ctx)
  File "c:\python27\lib\site-packages\click\core.py", line 1066, in invoke
    return _process_result(sub_ctx.command.invoke(sub_ctx))
  File "c:\python27\lib\site-packages\click\core.py", line 1066, in invoke
    return _process_result(sub_ctx.command.invoke(sub_ctx))
  File "c:\python27\lib\site-packages\click\core.py", line 895, in invoke
    return ctx.invoke(self.callback, **ctx.params)
  File "c:\python27\lib\site-packages\click\core.py", line 535, in invoke
    return callback(*args, **kwargs)
  File "c:\python27\lib\site-packages\nordicsemi\__main__.py", line 838, in ble
    dfu.dfu_send_images()
  File "c:\python27\lib\site-packages\nordicsemi\dfu\dfu.py", line 129, in dfu_send_images
    self._dfu_send_image(self.manifest.application)
  File "c:\python27\lib\site-packages\nordicsemi\dfu\dfu.py", line 90, in _dfu_send_image
    self.dfu_transport.open()
  File "c:\python27\lib\site-packages\nordicsemi\dfu\dfu_transport_ble.py", line 453, in open
    target_device_addr = self.target_device_addr)
  File "c:\python27\lib\site-packages\nordicsemi\dfu\dfu_transport_ble.py", line 153, in connect
    self.jump_from_buttonless_mode_to_bootloader(DFUAdapter.BLE_DFU_BUTTONLESS_BONDED_CHAR_UUID)
  File "c:\python27\lib\site-packages\nordicsemi\dfu\dfu_transport_ble.py", line 196, in jump_from_buttonless_mode_to_bootloader
    response = self.indication_q.get(timeout=DfuTransportBle.DEFAULT_TIMEOUT)
  File "c:\python27\lib\Queue.py", line 176, in get
    raise Empty
Queue.Empty

Is there a solution solving this problem?

Best regards

Roland

[run_ar]

Hi,

I am really sorry for the late reply, this seems to have fallen out of my radar. Are you still having issues with this or where you able to resolve it?

[roland.schenk]

Hi,
This problem is still existing.
Best Regards
Roland