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