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133 lines
4.8 KiB
Python
133 lines
4.8 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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import asyncio
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import math
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import random
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import struct
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# -----------------------------------------------------------------------------
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# Imports
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# -----------------------------------------------------------------------------
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import sys
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import time
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import bumble.logging
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from bumble import data_types
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from bumble.core import AdvertisingData
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from bumble.device import Device
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from bumble.profiles.device_information_service import DeviceInformationService
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from bumble.profiles.heart_rate_service import HeartRateService
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from bumble.transport import open_transport
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from bumble.utils import AsyncRunner
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# -----------------------------------------------------------------------------
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async def main() -> None:
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if len(sys.argv) != 3:
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print('Usage: python heart_rate_server.py <device-config> <transport-spec>')
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print('example: python heart_rate_server.py device1.json usb:0')
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return
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async with await open_transport(sys.argv[2]) as hci_transport:
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device = Device.from_config_file_with_hci(
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sys.argv[1], hci_transport.source, hci_transport.sink
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)
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# Keep track of accumulated expended energy
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energy_start_time = time.time()
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def reset_energy_expended():
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nonlocal energy_start_time
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energy_start_time = time.time()
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# Add a Device Information Service and Heart Rate Service to the GATT sever
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device_information_service = DeviceInformationService(
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manufacturer_name='ACME',
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model_number='HR-102',
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serial_number='7654321',
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hardware_revision='1.1.3',
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software_revision='2.5.6',
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system_id=(0x123456, 0x8877665544),
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)
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heart_rate_service = HeartRateService(
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read_heart_rate_measurement=lambda _: HeartRateService.HeartRateMeasurement(
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heart_rate=100 + int(50 * math.sin(time.time() * math.pi / 60)),
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sensor_contact_detected=random.choice((True, False, None)),
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energy_expended=random.choice(
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(int((time.time() - energy_start_time) * 100), None)
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),
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rr_intervals=random.choice(
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(
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(
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random.randint(900, 1100) / 1000,
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random.randint(900, 1100) / 1000,
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),
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None,
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)
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),
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),
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body_sensor_location=HeartRateService.BodySensorLocation.WRIST,
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reset_energy_expended=lambda _: reset_energy_expended(),
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)
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device.add_services([device_information_service, heart_rate_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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[
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data_types.CompleteLocalName('Bumble Heart'),
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data_types.IncompleteListOf16BitServiceUUIDs(
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[heart_rate_service.uuid]
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),
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data_types.Appearance(
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data_types.Appearance.Category.HEART_RATE_SENSOR,
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data_types.Appearance.HeartRateSensorSubcategory.GENERIC_HEART_RATE_SENSOR,
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),
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]
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)
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)
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# Notify subscribers of the current value as soon as they subscribe
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def on_subscription(connection, notify_enabled, indicate_enabled):
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if notify_enabled or indicate_enabled:
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AsyncRunner.spawn(
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device.notify_subscriber(
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connection,
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heart_rate_service.heart_rate_measurement_characteristic,
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)
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)
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heart_rate_service.heart_rate_measurement_characteristic.on(
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'subscription', on_subscription
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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(
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heart_rate_service.heart_rate_measurement_characteristic
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)
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# -----------------------------------------------------------------------------
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bumble.logging.setup_basic_logging('DEBUG')
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asyncio.run(main())
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