Hello,
We integrated latest released version of "pc-ble-driver.py" & "nrfutil" in our custom linux os running on ARM 32bit based custom board (B1).
pc_ble_driver_py : https://github.com/NordicSemiconductor/pc-ble-driver-py/tree/v0.14.2
nrfutil : https://github.com/NordicSemiconductor/pc-nrfutil/tree/v6.1
Connectivity-app : https://github.com/NordicSemiconductor/pc-ble-driver/tree/v4.1.1/hex
B1 has NRF52840 Controller on it which is connected with B1 application chip over Serial interface.
We need to perform DFU over BLE by using integrated "nrfutil" source. For this, we modified "connectivity source-code" from "pc-ble-driver" to set baud-rate 38400 from 1000000 (as this was not working) and recompile "ser_s132v5_hci" version.We also modified "response_timeout=1200", "retransmission_interval=300" within ble_driver.py according to modified baud-rate value.
With these configuration, BLE-DFU happening with our target device but sometimes "pc-ble_driver" throws an exception "NRF_ERROR_SD_RPC_NO_RESPONSE" from various places.
We are also getting MTU related exception sometimes saying "MTU exchange request failed. Common causes are: missing att_mtu setting in ble_cfg_set, different config tags used in ble_cfg_set and connect."
I made sure that configuration-tag is "1" in whenever connecting with (Nordic_Buttonless/DfuTarg). We are not explicitly providing any MTU value in "nrfutil dfu ble" call.
To mitigate with this issue, we are currently retrying entire DFU again for the same target. When I looked inside connectivity-code, I could see that there are an issue in sequence-number/ack-number which is unequal and packets being dropped by connectivity module.
Will you please let us know why this is happening and what will be the solution to get rid out of "NRF_ERROR_SD_RPC_NO_RESPONSE" and "MTU" related issue?
sample RPC issue log:
[2020-07-23 10:19:30.758] Traceback (most recent call last):
[2020-07-23 10:19:30.758] File "nordicsemi/__main__.py", line 1521, in <module>
[2020-07-23 10:19:30.758] cli()
[2020-07-23 10:19:30.758] File "/usr/lib/python3.7/site-packages/click/core.py", line 857, in __call__
[2020-07-23 10:19:30.758] return self.main(*args, **kwargs)
[2020-07-23 10:19:30.758] File "/usr/lib/python3.7/site-packages/click/core.py", line 810, in main
[2020-07-23 10:19:30.758] rv = self.invoke(ctx)
[2020-07-23 10:19:30.758] File "/usr/lib/python3.7/site-packages/click/core.py", line 1292, in invoke
[2020-07-23 10:19:30.758] return _process_result(sub_ctx.command.invoke(sub_ctx))
[2020-07-23 10:19:30.758] File "/usr/lib/python3.7/site-packages/click/core.py", line 1292, in invoke
[2020-07-23 10:19:30.758] return _process_result(sub_ctx.command.invoke(sub_ctx))
[2020-07-23 10:19:30.758] File "/usr/lib/python3.7/site-packages/click/core.py", line 1099, in invoke
[2020-07-23 10:19:30.758] return ctx.invoke(self.callback, **ctx.params)
[2020-07-23 10:19:30.758] File "/usr/lib/python3.7/site-packages/click/core.py", line 613, in invoke
[2020-07-23 10:19:30.758] return callback(*args, **kwargs)
[2020-07-23 10:19:30.758] File "nordicsemi/__main__.py", line 1183, in ble
[2020-07-23 10:19:30.758] dfu.dfu_send_images()
[2020-07-23 10:19:30.758] File "/usr/lib/python3.7/site-packages/nrfutil-6.1.0-py3.7.egg/nordicsemi/dfu/dfu.py", line 127, in dfu_send_images
[2020-07-23 10:19:30.783] self._dfu_send_image(self.manifest.application)
[2020-07-23 10:19:30.783] File "/usr/lib/python3.7/site-packages/nrfutil-6.1.0-py3.7.egg/nordicsemi/dfu/dfu.py", line 88, in _dfu_send_image
[2020-07-23 10:19:30.783] self.dfu_transport.open()
[2020-07-23 10:19:30.783] File "/usr/lib/python3.7/site-packages/nrfutil-6.1.0-py3.7.egg/nordicsemi/dfu/dfu_transport_ble.py", line 520, in open
[2020-07-23 10:19:30.783] target_device_addr = self.target_device_addr)
[2020-07-23 10:19:30.783] File "/usr/lib/python3.7/site-packages/nrfutil-6.1.0-py3.7.egg/nordicsemi/dfu/dfu_transport_ble.py", line 165, in connect
[2020-07-23 10:19:30.783] self.jump_from_buttonless_mode_to_bootloader(DFUAdapter.BLE_DFU_BUTTONLESS_BONDED_CHAR_UUID)
[2020-07-23 10:19:30.783] File "/usr/lib/python3.7/site-packages/nrfutil-6.1.0-py3.7.egg/nordicsemi/dfu/dfu_transport_ble.py", line 213, in jump_from_buttonless_mode_to_bootloader
[2020-07-23 10:19:30.783] self.adapter.enable_indication(self.conn_handle, buttonless_uuid)
[2020-07-23 10:19:30.783] File "/usr/lib/python3.7/site-packages/wrapt/wrappers.py", line 606, in __call__
[2020-07-23 10:19:30.783] args, kwargs)
[2020-07-23 10:19:30.783] File "/usr/lib/python3.7/site-packages/pc_ble_driver_py/ble_driver.py", line 104, in wrapper
[2020-07-23 10:19:30.804] err_code = wrapped(*args, **kwargs)
[2020-07-23 10:19:30.804] File "/usr/lib/python3.7/site-packages/pc_ble_driver_py/ble_adapter.py", line 413, in enable_indication
[2020-07-23 10:19:30.804] self.driver.ble_gattc_write(conn_handle, write_params)
[2020-07-23 10:19:30.804] File "/usr/lib/python3.7/site-packages/wrapt/wrappers.py", line 606, in __call__
[2020-07-23 10:19:30.804] args, kwargs)
[2020-07-23 10:19:30.804] File "/usr/lib/python3.7/site-packages/pc_ble_driver_py/ble_driver.py", line 110, in wrapper
[2020-07-23 10:19:30.804] error_code=err_code,
[2020-07-23 10:19:30.804] pc_ble_driver_py.exceptions.NordicSemiException: Failed to ble_gattc_write. Error code: NRF_ERROR_SD_RPC_NO_RESPONSE
