soft device error: 0004 when paring with BLE HID peripheral

[dzervas]

I'm trying to get the BLE HID central to play (I just need the event report bytes). HID needs pairing and when I try to pair I get the following error and then the BT connection just times out:

Traceback (most recent call last):
  File "code.py", line 40, in <module>
  File "adafruit_ble/__init__.py", line 143, in pair
_bleio.BluetoothError: Unknown soft device error: 0004

The code I use is the following

import _bleio
import board
import time
# import usb_hid

from adafruit_ble import BLERadio
from adafruit_ble.advertising.standard import ProvideServicesAdvertisement
from adafruit_ble.services.standard.hid import HIDService

# keyboard = usb_hid.devices[0]

# keyboard.send_report()

ble = BLERadio()
bleHid = None

# _bleio.adapter.erase_bonding()
if ble.connected:
    for conn in ble.connections:
        conn.disconnect()
        # if HIDService in conn:
        #     bleHid = conn
        #     break

while True:
    if not bleHid:
        print("Scanning...")
        for adv in ble.start_scan(ProvideServicesAdvertisement, timeout=5, extended=True):
            print(f"Discovered '{adv.complete_name}'")

            conn = ble.connect(adv)
            if HIDService in conn:
                print("Found HID service advertisement!")
            else:
                conn.disconnect()
                continue

            if not conn.paired:
                print("Pairing...")
                conn.pair()
                print("Paired")

            print("Putting keyboard in boot report mode")
            print(conn[HIDService].protocol_mode)
            conn[HIDService].protocol_mode = 0
            print(conn[HIDService].protocol_mode)

            bleHid = conn

            break

        ble.stop_scan()

    while bleHid and bleHid.connected:
        # print(bleHid[HIDService].boot_keyboard_out)
        data = bleHid[HIDService].boot_keyboard_out
        # data = bleHid[HIDService].devices[0].report
        # print(conn._constructed_services)
        data_int = int.from_bytes(data, "big")
        # print(data_int)
        if data_int != 0:
            print(data)
        # time.sleep(0.2)

    time.sleep(0.2)

I tried # _bleio.adapter.erase_bonding() just in case the flash is full at the address that pairings take place but it didn't work (same exact error). I'm starting to think that this is a circuitpython error?

I'm on an nrf52840 btw and the peripheral is known to work flawlessly.

[dzervas]

I tried the same code on circuitpython 6.0.0-alpha3 downloaded from the website (I'm using a Particle Xenon) and I get the same error

[dhalbert]

I had a discord conversation with @dzervas about this previously, and will look at this at some point. I do not remember whether I implemented pairing as a central yet.