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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
# -----------------------------------------------------------------------------
import asyncio
import sys
import bumble.logging
from bumble.colors import color
from bumble.device import Device
from bumble.hci import Address
from bumble.profiles.battery_service import BatteryServiceProxy
from bumble.transport import open_transport
# -----------------------------------------------------------------------------
async def main() -> None:
if len(sys.argv) != 3:
print('Usage: battery_client.py <transport-spec> <bluetooth-address>')
print('example: battery_client.py usb:0 E1:CA:72:48:C4:E8')
return
print('<<< connecting to HCI...')
async with await open_transport(sys.argv[1]) as hci_transport:
print('<<< connected')
# Create and start a device
device = Device.with_hci(
'Bumble',
Address('F0:F1:F2:F3:F4:F5'),
hci_transport.source,
hci_transport.sink,
)
await device.power_on()
# Connect to the peer
target_address = sys.argv[2]
print(f'=== Connecting to {target_address}...')
async with device.connect_as_gatt(target_address) as peer:
print(f'=== Connected to {peer}')
battery_service = peer.create_service_proxy(BatteryServiceProxy)
# Check that the service was found
if not battery_service:
print('!!! Service not found')
return
# Subscribe to and read the battery level
if battery_service.battery_level:
await battery_service.battery_level.subscribe(
lambda value: print(
f'{color("Battery Level Update:", "green")} {value}'
)
)
value = await battery_service.battery_level.read_value()
print(f'{color("Initial Battery Level:", "green")} {value}')
await peer.sustain()
# -----------------------------------------------------------------------------
bumble.logging.setup_basic_logging('DEBUG')
asyncio.run(main())
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