BLE bonding/pairing with pc-ble-driver-py

RE: BLE bonding/pairing with pc-ble-driver-py

james s — Wed, 17 Oct 2018 14:55:55 GMT

I've solved it now, I needed to delete the bond information from the peripheral device which I was connecting to between tests. This is why it wasn't sending a ble_gap_evt_sec_params_request.

Thanks for your help!

RE: BLE bonding/pairing with pc-ble-driver-py

james s — Wed, 17 Oct 2018 09:38:21 GMT

I'm calling it from the main function of the program, after a connection has been established. I'm developing a central application using the heart_rate_collector example as a starting point, and I'm trying to extend its functionality to include pairing / bonding.

RE: BLE bonding/pairing with pc-ble-driver-py

Jørgen Holmefjord — Wed, 17 Oct 2018 09:10:54 GMT

This error code is described in the API documentation:

This function is only used to reply to a BLE_GAP_EVT_SEC_PARAMS_REQUEST, calling it at other times will result in an NRF_ERROR_INVALID_STATE.

Where did you call it from? Are you developing a central or peripheral application using pc-ble-driver-py?

RE: BLE bonding/pairing with pc-ble-driver-py

james s — Wed, 17 Oct 2018 07:54:30 GMT

Hi Jørgen, thanks for getting back to me.

I've had a look at the documentation you linked to and I'm still having issues with my program. To setup bonding my code is currently:

self.sec_params = BLEGapSecParams(bond=True,
                                  mitm=False,
                                  lesc=False,
                                  keypress=False,
                                  io_caps=BLEGapIOCaps.none,
                                  oob=False,
                                  min_key_size=7,
                                  max_key_size=16,
                                  kdist_own=self.kdist_own,
                                  kdist_peer=self.kdist_peer)

self.adapter.driver.ble_gap_authenticate(self.conn_handle, self.sec_params)
self.evt_sync.wait(evt="sec_params")
self.adapter.driver.ble_gap_sec_params_reply(self.conn_handle,
                                             BLEGapSecStatus.success,
                                             None)

But this fails with the message "pc_ble_driver_py.exceptions.NordicSemiException: Failed to ble_gap_sec_params_reply. Error code: 8"

I have also tried running:

collector.adapter.authenticate(conn_handle, bond=True)

But this failed with the same error. Is there something I'm missing that's causing this?

Thanks,

James

RE: BLE bonding/pairing with pc-ble-driver-py

Jørgen Holmefjord — Tue, 16 Oct 2018 12:56:02 GMT

Hi,

You should have a look at the API documentation of the softdevice functions mentioned in the implementation of Authenticate and Encrypt methods, and check how they are used in the SDK examples:

Best regards,
Jørgen