1# Copyright 2021-2022 Google LLC 2# 3# Licensed under the Apache License, Version 2.0 (the "License"); 4# you may not use this file except in compliance with the License. 5# You may obtain a copy of the License at 6# 7# https://www.apache.org/licenses/LICENSE-2.0 8# 9# Unless required by applicable law or agreed to in writing, software 10# distributed under the License is distributed on an "AS IS" BASIS, 11# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 12# See the License for the specific language governing permissions and 13# limitations under the License. 14 15 16# ----------------------------------------------------------------------------- 17# Imports 18# ----------------------------------------------------------------------------- 19from ..gatt_client import ProfileServiceProxy 20from ..gatt import ( 21 GATT_BATTERY_SERVICE, 22 GATT_BATTERY_LEVEL_CHARACTERISTIC, 23 TemplateService, 24 Characteristic, 25 CharacteristicValue, 26 PackedCharacteristicAdapter, 27) 28 29 30# ----------------------------------------------------------------------------- 31class BatteryService(TemplateService): 32 UUID = GATT_BATTERY_SERVICE 33 BATTERY_LEVEL_FORMAT = 'B' 34 35 def __init__(self, read_battery_level): 36 self.battery_level_characteristic = PackedCharacteristicAdapter( 37 Characteristic( 38 GATT_BATTERY_LEVEL_CHARACTERISTIC, 39 Characteristic.READ | Characteristic.NOTIFY, 40 Characteristic.READABLE, 41 CharacteristicValue(read=read_battery_level), 42 ), 43 pack_format=BatteryService.BATTERY_LEVEL_FORMAT, 44 ) 45 super().__init__([self.battery_level_characteristic]) 46 47 48# ----------------------------------------------------------------------------- 49class BatteryServiceProxy(ProfileServiceProxy): 50 SERVICE_CLASS = BatteryService 51 52 def __init__(self, service_proxy): 53 self.service_proxy = service_proxy 54 55 if characteristics := service_proxy.get_characteristics_by_uuid( 56 GATT_BATTERY_LEVEL_CHARACTERISTIC 57 ): 58 self.battery_level = PackedCharacteristicAdapter( 59 characteristics[0], pack_format=BatteryService.BATTERY_LEVEL_FORMAT 60 ) 61 else: 62 self.battery_level = None 63