Bluetooth command failed (code: 3, error: Attribute can't be written)

[carbolymer]

I'm getting similar error to https://github.com/drndos/mikettle-ha/issues/3#issue-534502980 in my HA. So I went further and I'm trying to troubleshoot the root cause.

I'm trying to run demo.py but I'm getting the following error:

$ python demo.py connect AB:CD:EF:12:34:56 275
DEBUG:mikettle.mikettle:Init Mikettle with mac AB:CD:EF:12:34:56 and pid 275
Authenticating
Getting data from mi Kettle
Traceback (most recent call last):
  File "/tmp/mikettle/mikettle/demo.py", line 78, in <module>
    main()
  File "/tmp/mikettle/mikettle/demo.py", line 74, in main
    args.func(args)
  File "/tmp/mikettle/mikettle/demo.py", line 46, in connect
    print("FW: {}".format(kettle.firmware_version()))
  File "/tmp/mikettle/mikettle/mikettle/mikettle.py", line 99, in firmware_version
    self.auth()
  File "/tmp/mikettle/mikettle/mikettle/mikettle.py", line 181, in auth
    self._p.writeCharacteristic(_HANDLE_AUTH_INIT, _KEY1, "true")
  File "/tmp/mikettle/venv/lib/python3.9/site-packages/bluepy/btle.py", line 543, in writeCharacteristic
    return self._getResp('wr')
  File "/tmp/mikettle/venv/lib/python3.9/site-packages/bluepy/btle.py", line 407, in _getResp
    resp = self._waitResp(wantType + ['ntfy', 'ind'], timeout)
  File "/tmp/mikettle/venv/lib/python3.9/site-packages/bluepy/btle.py", line 368, in _waitResp
    raise BTLEGattError("Bluetooth command failed", resp)
bluepy.btle.BTLEGattError: Bluetooth command failed (code: 3, error: Attribute can't be written)

@djmalin, how did you fix your your issue? Any ideas what might be wrong?