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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
# -----------------------------------------------------------------------------
from __future__ import annotations
import dataclasses
import enum
import struct
from collections.abc import Callable, Sequence
from typing import Any
from typing_extensions import Self
from bumble import att, core, device, gatt, gatt_adapters, gatt_client, utils
# -----------------------------------------------------------------------------
class HeartRateService(gatt.TemplateService):
UUID = gatt.GATT_HEART_RATE_SERVICE
HEART_RATE_CONTROL_POINT_FORMAT = 'B'
CONTROL_POINT_NOT_SUPPORTED = 0x80
RESET_ENERGY_EXPENDED = 0x01
heart_rate_measurement_characteristic: gatt.Characteristic[HeartRateMeasurement]
body_sensor_location_characteristic: gatt.Characteristic[BodySensorLocation]
heart_rate_control_point_characteristic: gatt.Characteristic[int]
class BodySensorLocation(utils.OpenIntEnum):
OTHER = 0
CHEST = 1
WRIST = 2
FINGER = 3
HAND = 4
EAR_LOBE = 5
FOOT = 6
@dataclasses.dataclass
class HeartRateMeasurement:
heart_rate: int
sensor_contact_detected: bool | None = None
energy_expended: int | None = None
rr_intervals: Sequence[float] | None = None
class Flag(enum.IntFlag):
INT16_HEART_RATE = 1 << 0
SENSOR_CONTACT_DETECTED = 1 << 1
SENSOR_CONTACT_SUPPORTED = 1 << 2
ENERGY_EXPENDED_STATUS = 1 << 3
RR_INTERVAL = 1 << 4
def __post_init__(self) -> None:
if self.heart_rate < 0 or self.heart_rate > 0xFFFF:
raise core.InvalidArgumentError('heart_rate out of range')
if self.energy_expended is not None and (
self.energy_expended < 0 or self.energy_expended > 0xFFFF
):
raise core.InvalidArgumentError('energy_expended out of range')
if self.rr_intervals:
for rr_interval in self.rr_intervals:
if rr_interval < 0 or rr_interval * 1024 > 0xFFFF:
raise core.InvalidArgumentError('rr_intervals out of range')
@classmethod
def from_bytes(cls, data: bytes) -> Self:
flags = data[0]
offset = 1
if flags & cls.Flag.INT16_HEART_RATE:
heart_rate = struct.unpack_from('<H', data, offset)[0]
offset += 2
else:
heart_rate = struct.unpack_from('B', data, offset)[0]
offset += 1
if flags & cls.Flag.SENSOR_CONTACT_SUPPORTED:
sensor_contact_detected = flags & cls.Flag.SENSOR_CONTACT_DETECTED != 0
else:
sensor_contact_detected = None
if flags & cls.Flag.ENERGY_EXPENDED_STATUS:
energy_expended = struct.unpack_from('<H', data, offset)[0]
offset += 2
else:
energy_expended = None
rr_intervals: Sequence[float] | None = None
if flags & cls.Flag.RR_INTERVAL:
rr_intervals = tuple(
struct.unpack_from('<H', data, i)[0] / 1024
for i in range(offset, len(data), 2)
)
return cls(
heart_rate=heart_rate,
sensor_contact_detected=sensor_contact_detected,
energy_expended=energy_expended,
rr_intervals=rr_intervals,
)
def __bytes__(self) -> bytes:
flags = 0
if self.heart_rate < 256:
data = struct.pack('B', self.heart_rate)
else:
flags |= self.Flag.INT16_HEART_RATE
data = struct.pack('<H', self.heart_rate)
if self.sensor_contact_detected is not None:
flags |= self.Flag.SENSOR_CONTACT_SUPPORTED
if self.sensor_contact_detected:
flags |= self.Flag.SENSOR_CONTACT_DETECTED
if self.energy_expended is not None:
flags |= self.Flag.ENERGY_EXPENDED_STATUS
data += struct.pack('<H', self.energy_expended)
if self.rr_intervals is not None:
flags |= self.Flag.RR_INTERVAL
data += b''.join(
[
struct.pack('<H', int(rr_interval * 1024))
for rr_interval in self.rr_intervals
]
)
return bytes([flags]) + data
def __init__(
self,
read_heart_rate_measurement: Callable[
[device.Connection], HeartRateMeasurement
],
body_sensor_location: HeartRateService.BodySensorLocation | None = None,
reset_energy_expended: Callable[[device.Connection], Any] | None = None,
):
self.heart_rate_measurement_characteristic = (
gatt_adapters.SerializableCharacteristicAdapter(
gatt.Characteristic(
uuid=gatt.GATT_HEART_RATE_MEASUREMENT_CHARACTERISTIC,
properties=gatt.Characteristic.Properties.NOTIFY,
permissions=gatt.Characteristic.Permissions(0),
value=gatt.CharacteristicValue(read=read_heart_rate_measurement),
),
HeartRateService.HeartRateMeasurement,
)
)
characteristics: list[gatt.Characteristic] = [
self.heart_rate_measurement_characteristic
]
if body_sensor_location is not None:
self.body_sensor_location_characteristic = (
gatt_adapters.EnumCharacteristicAdapter(
gatt.Characteristic(
uuid=gatt.GATT_BODY_SENSOR_LOCATION_CHARACTERISTIC,
properties=gatt.Characteristic.Properties.READ,
permissions=gatt.Characteristic.READABLE,
value=body_sensor_location,
),
cls=self.BodySensorLocation,
length=1,
)
)
characteristics.append(self.body_sensor_location_characteristic)
if reset_energy_expended:
def write_heart_rate_control_point_value(
connection: device.Connection, value: bytes
) -> None:
if value == self.RESET_ENERGY_EXPENDED:
if reset_energy_expended is not None:
reset_energy_expended(connection)
else:
raise att.ATT_Error(self.CONTROL_POINT_NOT_SUPPORTED)
self.heart_rate_control_point_characteristic = (
gatt_adapters.PackedCharacteristicAdapter(
gatt.Characteristic(
uuid=gatt.GATT_HEART_RATE_CONTROL_POINT_CHARACTERISTIC,
properties=gatt.Characteristic.Properties.WRITE,
permissions=gatt.Characteristic.WRITEABLE,
value=gatt.CharacteristicValue(
write=write_heart_rate_control_point_value
),
),
pack_format=HeartRateService.HEART_RATE_CONTROL_POINT_FORMAT,
)
)
characteristics.append(self.heart_rate_control_point_characteristic)
super().__init__(characteristics)
# -----------------------------------------------------------------------------
class HeartRateServiceProxy(gatt_client.ProfileServiceProxy):
SERVICE_CLASS = HeartRateService
heart_rate_measurement: gatt_client.CharacteristicProxy[
HeartRateService.HeartRateMeasurement
]
body_sensor_location: (
gatt_client.CharacteristicProxy[HeartRateService.BodySensorLocation] | None
)
heart_rate_control_point: gatt_client.CharacteristicProxy[int] | None
def __init__(self, service_proxy: gatt_client.ServiceProxy) -> None:
self.service_proxy = service_proxy
self.heart_rate_measurement = (
gatt_adapters.SerializableCharacteristicProxyAdapter(
service_proxy.get_required_characteristic_by_uuid(
gatt.GATT_HEART_RATE_MEASUREMENT_CHARACTERISTIC
),
HeartRateService.HeartRateMeasurement,
)
)
if characteristics := service_proxy.get_characteristics_by_uuid(
gatt.GATT_BODY_SENSOR_LOCATION_CHARACTERISTIC
):
self.body_sensor_location = gatt_adapters.EnumCharacteristicProxyAdapter(
characteristics[0], cls=HeartRateService.BodySensorLocation, length=1
)
else:
self.body_sensor_location = None
if characteristics := service_proxy.get_characteristics_by_uuid(
gatt.GATT_HEART_RATE_CONTROL_POINT_CHARACTERISTIC
):
self.heart_rate_control_point = (
gatt_adapters.PackedCharacteristicProxyAdapter(
characteristics[0],
pack_format=HeartRateService.HEART_RATE_CONTROL_POINT_FORMAT,
)
)
else:
self.heart_rate_control_point = None
async def reset_energy_expended(self) -> None:
if self.heart_rate_control_point is not None:
return await self.heart_rate_control_point.write_value(
HeartRateService.RESET_ENERGY_EXPENDED
)
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