Disconnecting the Target device from the nRF52 DK after performing dfu over ble

[Vardhan Bhargava]

Hi,

I am using a nRF52 DK board and programming in python.

After performing a successful DFU over BLE i want my Target device to be disconnected from the nRF board so that i can check if the device is advertising again or not.

Is there a function or statement in python that helps disconnecting from a device connected through BLE?

[Einar Thorsrud]

Hi,

Can you elaborate a bit what you are doing? How are you using Python?

[Vardhan Bhargava]

Hi,

I am using the __main__.py program in nrfutil which is used to perform DFU over BLE. 

I need to upgrade the firmware of a custom board through my nRF52 DK board.

After upgrading the firmware, I need to do a few other things for which i need the element to be disconnected from the nRF52 board.

I am able to perform DFU through BLE but i am not able to disconnect from the element.

Is there a function that allows us to disconnect from the device which is connected through BLE?

[Einar Thorsrud]

I see. pc-nrfutil uses pc-ble-driver-py (you can see most of it in dfu_transport_ble.py). You can use self.adapter.disconnect(self.conn_handle) to disconnect, as is done in the close function.

[Vardhan Bhargava]

ble_backend = DfuTransportBle(serial_port=str(port),

target_device_name=str(name),

target_device_addr=str(TARGET_DEV_ADDRESS))

ble_backend.register_events_callback(DfuEvent.PROGRESS_EVENT, update_progress)

dfu = Dfu(zip_file_path = filename, dfu_transport = ble_backend, connect_delay = 3)

if logger.getEffectiveLevel() > logging.INFO:

with click.progressbar(length=dfu.dfu_get_total_size()) as bar:

global_bar = bar

dfu.dfu_send_images()

else:

dfu.dfu_send_images()

click.echo("Device programmed with Application.")

This is the code for performing DFU over BLE. It does not return a conn_handle anywhere for me to send it as a parameter in the close function.

[Einar Thorsrud]

Yes, you would have to modify nrfutil to do it this way. Alternatively, and simpler: why don't you simply let the nrfutil program finish since you anyway want to disconnect and then do your work later? nrfutil will disconnect before it finishes after a DFU upgrade anyway, so you get that for free.