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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 random
import struct
import sys
import bumble.logging
from bumble import data_types
from bumble.core import AdvertisingData
from bumble.device import Device
from bumble.profiles.battery_service import BatteryService
from bumble.transport import open_transport
# -----------------------------------------------------------------------------
async def main() -> None:
if len(sys.argv) != 3:
print('Usage: python battery_server.py <device-config> <transport-spec>')
print('example: python battery_server.py device1.json usb:0')
return
async with await open_transport(sys.argv[2]) as hci_transport:
device = Device.from_config_file_with_hci(
sys.argv[1], hci_transport.source, hci_transport.sink
)
# Add a Battery Service to the GATT sever
battery_service = BatteryService(lambda _: random.randint(0, 100))
device.add_service(battery_service)
# Set the advertising data
device.advertising_data = bytes(
AdvertisingData(
[
data_types.CompleteLocalName('Bumble Battery'),
data_types.IncompleteListOf16BitServiceUUIDs(
[battery_service.uuid]
),
data_types.Appearance(
data_types.Appearance.Category.WEARABLE_AUDIO_DEVICE,
data_types.Appearance.WearableAudioDeviceSubcategory.EARBUD,
),
]
)
)
# Go!
await device.power_on()
await device.start_advertising(auto_restart=True)
# Notify every 3 seconds
while True:
await asyncio.sleep(3.0)
await device.notify_subscribers(
battery_service.battery_level_characteristic
)
# -----------------------------------------------------------------------------
bumble.logging.setup_basic_logging('DEBUG')
asyncio.run(main())
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