Encryption on nRF52840 with CircuitPython

[smoothy]

Using a BLE characteristic on a CircuitPython peripheral with

Code: Select all

read_perm = Attribute.ENCRYPT_WITH_MITM, 

https://docs.circuitpython.org/projects ... _WITH_MITM

Reading that characteristic from the nRF Connect app after pairing, gives the following error

Error 137 (0x89): GATT AUTH FAIL

The nRF52840 has encryption hardware which I assume CircuitPython enables. Are there additional steps my code should take to make this encrypted characteristic work? Is there additional documentation or source code on using encrypted characteristics in CircuitPython?

Additional info:

• The peripheral's code calls pair() on elements of ble.connections which results in a prompt to pair and bonding on the nRF Connect app
• Everything works with Attribute.OPEN
• The nRF Connect app is just for development, ultimately another CircuitPython device will act as the BLE controller

[smoothy]

Is there a way to set a passkey, PIN or Out-of-Band data in adafruit_ble?

Encryption without MITM protection works on the nRF52840, but MITM protection requires a shared passkey or Out-of-Band data. How can this be configured in CircuitPython?

[adafruit_support_mike]

[moved to the CircuitPython forum]

[danhalbert]

We have not implemented this yet. We just have regular bonding/pairing, sorry.