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# Copyright 2021-2022 Google LLC
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# https://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
# -----------------------------------------------------------------------------
# Imports
# -----------------------------------------------------------------------------
from collections.abc import Callable
from bumble import device, gatt, gatt_adapters, gatt_client
# -----------------------------------------------------------------------------
class BatteryService(gatt.TemplateService):
UUID = gatt.GATT_BATTERY_SERVICE
BATTERY_LEVEL_FORMAT = 'B'
battery_level_characteristic: gatt.Characteristic[int]
def __init__(self, read_battery_level: Callable[[device.Connection], int]) -> None:
self.battery_level_characteristic = gatt_adapters.PackedCharacteristicAdapter(
gatt.Characteristic(
gatt.GATT_BATTERY_LEVEL_CHARACTERISTIC,
properties=(
gatt.Characteristic.Properties.READ
| gatt.Characteristic.Properties.NOTIFY
),
permissions=gatt.Characteristic.READABLE,
value=gatt.CharacteristicValue(read=read_battery_level),
),
pack_format=BatteryService.BATTERY_LEVEL_FORMAT,
)
super().__init__([self.battery_level_characteristic])
# -----------------------------------------------------------------------------
class BatteryServiceProxy(gatt_client.ProfileServiceProxy):
SERVICE_CLASS = BatteryService
battery_level: gatt_client.CharacteristicProxy[int]
def __init__(self, service_proxy: gatt_client.ServiceProxy) -> None:
self.service_proxy = service_proxy
self.battery_level = gatt_adapters.PackedCharacteristicProxyAdapter(
service_proxy.get_required_characteristic_by_uuid(
gatt.GATT_BATTERY_LEVEL_CHARACTERISTIC
),
pack_format=BatteryService.BATTERY_LEVEL_FORMAT,
)
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