nrf52840 Dongle and ble_serial.py

[abhipray]

I am trying to run ble_serial.py in the ble_app_cli SDK example using the nrf52840 dongle. To do so, I tried flashing the connectivity firmware automatically via the nrfConnect Desktop Bluetooth Low Energy application. When I run the python script, I can connect and everything runs OK for 30 seconds although there is one exception: 

Exception: 'BLE_Serial' object has no attribute 'on_gattc_evt_exchange_mtu_rsp'

After 30 seconds, it loses connection and constantly tries to reconnect with no success. I have also tried flashing connectivity_1.2.3_usb_dfu_pkg.zip from the pc-ble-driver repo checking to see if it could be a version issue but the problem exists there as well. 

Any idea what could be going wrong?

[abhipray]

I haven't found the answers yet. Additionally, I had another question -- does the dongle store the peer bond information on its flash (like using the peer manage) or do we need to store it locally on the PC?

[tesc]

Hi,

You need to store it on the PC. The connectivity firmware is serializing the SoftDevice only, i.e. the BLE stack. Everything normally done by the SDK libraries must be done on the PC.

That means you must also store bonding data and take care of everything that peer manager would have done on an nRF SoC.

Regards,
Terje