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Not possible to remove pairing with a BLE accessory

See original GitHub issue

Currently it is not possible to remove a BLE pairing: PYTHONPATH=. python3 homekit/unpair.py --log DEBUG -f ble.json -a DW1

This fails:

2019-01-11 06:40:16,366 ble_implementation.py:0292 DEBUG body: bytearray(b'\x06\x01\x01\x00\x01\x04\x01$066c8ca0-72ff-4e79-a2fd-be6ec86c77c6')
2019-01-11 06:40:16,371 ble_implementation.py:0299 DEBUG cipher and mac ade106a4434ab390d675d9033c18a0bd4f56a0a4a1e03d1f720e837fe83cd4ef9fe587c7c3c91aadfc91b31bd8f7de28db3a2bf4f32df84f91f12a6a16717dbd75
2019-01-11 06:40:16,371 ble_implementation.py:0302 DEBUG write resulted in: None
2019-01-11 06:40:17,373 ble_implementation.py:0309 DEBUG reading characteristic
Traceback (most recent call last):
  File "homekit/unpair.py", line 44, in <module>
    controller.remove_pairing(args.alias)
  File "/home/jlusiardi/Dokumente/src/homekit_python/homekit/controller/controller.py", line 315, in remove_pairing
    response = session.request(pair_remove_char, pair_remove_char_id, HapBleOpCodes.CHAR_WRITE, request_tlv)
  File "/home/jlusiardi/Dokumente/src/homekit_python/homekit/controller/ble_implementation.py", line 312, in request
    raise RuntimeError('Read failed')
RuntimeError: Read failed

The code starts roughly at https://github.com/jlusiardi/homekit_python/blob/add_bluetooth/homekit/controller/controller.py#L286