forked from auracaster/bumble_mirror
111 lines
3.8 KiB
Python
111 lines
3.8 KiB
Python
# Copyright 2021-2022 Google LLC
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# https://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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"""Generic Access Profile"""
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# -----------------------------------------------------------------------------
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# Imports
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# -----------------------------------------------------------------------------
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import logging
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import struct
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from typing import Optional, Tuple, Union
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from bumble.core import Appearance
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from bumble.gatt import (
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TemplateService,
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Characteristic,
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CharacteristicAdapter,
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DelegatedCharacteristicAdapter,
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UTF8CharacteristicAdapter,
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GATT_GENERIC_ACCESS_SERVICE,
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GATT_DEVICE_NAME_CHARACTERISTIC,
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GATT_APPEARANCE_CHARACTERISTIC,
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)
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from bumble.gatt_client import ProfileServiceProxy, ServiceProxy
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# -----------------------------------------------------------------------------
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# Logging
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# -----------------------------------------------------------------------------
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logger = logging.getLogger(__name__)
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# -----------------------------------------------------------------------------
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# Classes
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# -----------------------------------------------------------------------------
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# -----------------------------------------------------------------------------
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class GenericAccessService(TemplateService):
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UUID = GATT_GENERIC_ACCESS_SERVICE
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def __init__(
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self, device_name: str, appearance: Union[Appearance, Tuple[int, int], int] = 0
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):
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if isinstance(appearance, int):
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appearance_int = appearance
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elif isinstance(appearance, tuple):
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appearance_int = (appearance[0] << 6) | appearance[1]
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elif isinstance(appearance, Appearance):
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appearance_int = int(appearance)
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else:
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raise TypeError()
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self.device_name_characteristic = Characteristic(
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GATT_DEVICE_NAME_CHARACTERISTIC,
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Characteristic.Properties.READ,
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Characteristic.READABLE,
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device_name.encode('utf-8')[:248],
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)
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self.appearance_characteristic = Characteristic(
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GATT_APPEARANCE_CHARACTERISTIC,
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Characteristic.Properties.READ,
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Characteristic.READABLE,
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struct.pack('<H', appearance_int),
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)
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super().__init__(
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[self.device_name_characteristic, self.appearance_characteristic]
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)
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# -----------------------------------------------------------------------------
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class GenericAccessServiceProxy(ProfileServiceProxy):
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SERVICE_CLASS = GenericAccessService
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device_name: Optional[CharacteristicAdapter]
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appearance: Optional[DelegatedCharacteristicAdapter]
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def __init__(self, service_proxy: ServiceProxy):
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self.service_proxy = service_proxy
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if characteristics := service_proxy.get_characteristics_by_uuid(
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GATT_DEVICE_NAME_CHARACTERISTIC
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):
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self.device_name = UTF8CharacteristicAdapter(characteristics[0])
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else:
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self.device_name = None
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if characteristics := service_proxy.get_characteristics_by_uuid(
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GATT_APPEARANCE_CHARACTERISTIC
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):
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self.appearance = DelegatedCharacteristicAdapter(
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characteristics[0],
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decode=lambda value: Appearance.from_int(
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struct.unpack_from('<H', value, 0)[0],
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),
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)
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else:
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self.appearance = None
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