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67 lines
2.5 KiB
Python
67 lines
2.5 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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# -----------------------------------------------------------------------------
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# Imports
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# -----------------------------------------------------------------------------
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from collections.abc import Callable
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from bumble import device
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from bumble import gatt
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from bumble import gatt_adapters
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from bumble import gatt_client
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# -----------------------------------------------------------------------------
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class BatteryService(gatt.TemplateService):
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UUID = gatt.GATT_BATTERY_SERVICE
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BATTERY_LEVEL_FORMAT = 'B'
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battery_level_characteristic: gatt.Characteristic[int]
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def __init__(self, read_battery_level: Callable[[device.Connection], int]) -> None:
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self.battery_level_characteristic = gatt_adapters.PackedCharacteristicAdapter(
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gatt.Characteristic(
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gatt.GATT_BATTERY_LEVEL_CHARACTERISTIC,
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properties=(
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gatt.Characteristic.Properties.READ
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| gatt.Characteristic.Properties.NOTIFY
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),
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permissions=gatt.Characteristic.READABLE,
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value=gatt.CharacteristicValue(read=read_battery_level),
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),
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pack_format=BatteryService.BATTERY_LEVEL_FORMAT,
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)
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super().__init__([self.battery_level_characteristic])
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# -----------------------------------------------------------------------------
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class BatteryServiceProxy(gatt_client.ProfileServiceProxy):
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SERVICE_CLASS = BatteryService
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battery_level: gatt_client.CharacteristicProxy[int] | None
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def __init__(self, service_proxy: gatt_client.ServiceProxy) -> None:
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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.GATT_BATTERY_LEVEL_CHARACTERISTIC
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):
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self.battery_level = gatt_adapters.PackedCharacteristicProxyAdapter(
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characteristics[0], pack_format=BatteryService.BATTERY_LEVEL_FORMAT
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)
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else:
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self.battery_level = None
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