67 lines
2.5 KiB
Python
67 lines
2.5 KiB
Python
# Copyright 2021-2022 Google LLC
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# https://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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# -----------------------------------------------------------------------------
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# Imports
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# -----------------------------------------------------------------------------
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import asyncio
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import sys
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import os
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import logging
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import random
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import struct
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from bumble.core import AdvertisingData
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from bumble.device import Device
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from bumble.transport import open_transport_or_link
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from bumble.profiles.battery_service import BatteryService
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# -----------------------------------------------------------------------------
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async def main():
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if len(sys.argv) != 3:
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print('Usage: python battery_server.py <device-config> <transport-spec>')
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print('example: python battery_server.py device1.json usb:0')
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return
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async with await open_transport_or_link(sys.argv[2]) as (hci_source, hci_sink):
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device = Device.from_config_file_with_hci(sys.argv[1], hci_source, hci_sink)
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# Add a Device Information Service and Battery Service to the GATT sever
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battery_service = BatteryService(lambda _: random.randint(0, 100))
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device.add_service(battery_service)
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# Set the advertising data
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device.advertising_data = bytes(
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AdvertisingData([
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(AdvertisingData.COMPLETE_LOCAL_NAME, bytes('Bumble Battery', 'utf-8')),
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(AdvertisingData.INCOMPLETE_LIST_OF_16_BIT_SERVICE_CLASS_UUIDS, bytes(battery_service.uuid)),
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(AdvertisingData.APPEARANCE, struct.pack('<H', 0x0340))
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])
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)
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# Go!
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await device.power_on()
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await device.start_advertising(auto_restart=True)
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# Notify every 3 seconds
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while True:
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await asyncio.sleep(3.0)
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await device.notify_subscribers(battery_service.battery_level_characteristic)
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# -----------------------------------------------------------------------------
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logging.basicConfig(level = os.environ.get('BUMBLE_LOGLEVEL', 'DEBUG').upper())
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asyncio.run(main())
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