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# Imports 17# ----------------------------------------------------------------------------- 18import asyncio 19import sys 20import os 21import logging 22from bumble.colors import color 23from bumble.device import Device 24from bumble.transport import open_transport 25from bumble.profiles.battery_service import BatteryServiceProxy 26 27 28# ----------------------------------------------------------------------------- 29async def main(): 30 if len(sys.argv) != 3: 31 print('Usage: battery_client.py <transport-spec> <bluetooth-address>') 32 print('example: battery_client.py usb:0 E1:CA:72:48:C4:E8') 33 return 34 35 print('<<< connecting to HCI...') 36 async with await open_transport(sys.argv[1]) as (hci_source, hci_sink): 37 print('<<< connected') 38 39 # Create and start a device 40 device = Device.with_hci('Bumble', 'F0:F1:F2:F3:F4:F5', hci_source, hci_sink) 41 await device.power_on() 42 43 # Connect to the peer 44 target_address = sys.argv[2] 45 print(f'=== Connecting to {target_address}...') 46 async with device.connect_as_gatt(target_address) as peer: 47 print(f'=== Connected to {peer}') 48 battery_service = peer.create_service_proxy(BatteryServiceProxy) 49 50 # Check that the service was found 51 if not battery_service: 52 print('!!! Service not found') 53 return 54 55 # Subscribe to and read the battery level 56 if battery_service.battery_level: 57 await battery_service.battery_level.subscribe( 58 lambda value: print( 59 f'{color("Battery Level Update:", "green")} {value}' 60 ) 61 ) 62 value = await battery_service.battery_level.read_value() 63 print(f'{color("Initial Battery Level:", "green")} {value}') 64 65 await peer.sustain() 66 67 68# ----------------------------------------------------------------------------- 69logging.basicConfig(level=os.environ.get('BUMBLE_LOGLEVEL', 'DEBUG').upper()) 70asyncio.run(main()) 71