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# Copyright (C) 2022 The Qt Company Ltd.
# SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause
import struct
from enum import IntEnum
from PySide6.QtBluetooth import (QLowEnergyCharacteristic,
QLowEnergyController,
QLowEnergyDescriptor,
QLowEnergyService,
QBluetoothUuid)
from PySide6.QtQml import QmlNamedElement, QmlUncreatable
from PySide6.QtCore import (QByteArray, QDateTime, QRandomGenerator, QTimer,
Property, Signal, Slot, QEnum)
from bluetoothbaseclass import BluetoothBaseClass
from heartrate_global import simulator
# To be used on the @QmlElement decorator
# (QML_IMPORT_MINOR_VERSION is optional)
QML_IMPORT_NAME = "Shared"
QML_IMPORT_MAJOR_VERSION = 1
@QmlNamedElement("AddressType")
@QmlUncreatable("Enum is not a type")
class DeviceHandler(BluetoothBaseClass):
@QEnum
class AddressType(IntEnum):
PUBLIC_ADDRESS = 1
RANDOM_ADDRESS = 2
measuringChanged = Signal()
aliveChanged = Signal()
statsChanged = Signal()
def __init__(self, parent=None):
super().__init__(parent)
self.m_control = None
self.m_service = None
self.m_notificationDesc = QLowEnergyDescriptor()
self.m_currentDevice = None
self.m_foundHeartRateService = False
self.m_measuring = False
self.m_currentValue = 0
self.m_min = 0
self.m_max = 0
self.m_sum = 0
self.m_avg = 0.0
self.m_calories = 0.0
self.m_start = QDateTime()
self.m_stop = QDateTime()
self.m_measurements = []
self.m_addressType = QLowEnergyController.PublicAddress
self.m_demoTimer = QTimer()
if simulator:
self.m_demoTimer.setSingleShot(False)
self.m_demoTimer.setInterval(2000)
self.m_demoTimer.timeout.connect(self.updateDemoHR)
self.m_demoTimer.start()
self.updateDemoHR()
@Property(int)
def addressType(self):
if self.m_addressType == QLowEnergyController.RandomAddress:
return DeviceHandler.AddressType.RANDOM_ADDRESS
return DeviceHandler.AddressType.PUBLIC_ADDRESS
@addressType.setter
def addressType(self, type):
if type == DeviceHandler.AddressType.PUBLIC_ADDRESS:
self.m_addressType = QLowEnergyController.PublicAddress
elif type == DeviceHandler.AddressType.RANDOM_ADDRESS:
self.m_addressType = QLowEnergyController.RandomAddress
@Slot(QLowEnergyController.Error)
def controllerErrorOccurred(self, device):
self.error = "Cannot connect to remote device."
@Slot()
def controllerConnected(self):
self.info = "Controller connected. Search services..."
self.m_control.discoverServices()
@Slot()
def controllerDisconnected(self):
self.error = "LowEnergy controller disconnected"
def setDevice(self, device):
self.clearMessages()
self.m_currentDevice = device
if simulator:
self.info = "Demo device connected."
return
# Disconnect and delete old connection
if self.m_control:
self.m_control.disconnectFromDevice()
m_control = None
# Create new controller and connect it if device available
if self.m_currentDevice:
# Make connections
#! [Connect-Signals-1]
self.m_control = QLowEnergyController.createCentral(self.m_currentDevice.getDevice(), self)
#! [Connect-Signals-1]
self.m_control.setRemoteAddressType(self.m_addressType)
#! [Connect-Signals-2]
m_control.serviceDiscovered.connect(self.serviceDiscovered)
m_control.discoveryFinished.connect(self.serviceScanDone)
self.m_control.errorOccurred.connect(self.controllerErrorOccurred)
self.m_control.connected.connect(self.controllerConnected)
self.m_control.disconnected.connect(self.controllerDisconnected)
# Connect
self.m_control.connectToDevice()
#! [Connect-Signals-2]
@Slot()
def startMeasurement(self):
if self.alive:
self.m_start = QDateTime.currentDateTime()
self.m_min = 0
self.m_max = 0
self.m_avg = 0
self.m_sum = 0
self.m_calories = 0.0
self.m_measuring = True
self.m_measurements.clear()
self.measuringChanged.emit()
@Slot()
def stopMeasurement(self):
self.m_measuring = False
self.measuringChanged.emit()
#! [Filter HeartRate service 1]
@Slot(QBluetoothUuid)
def serviceDiscovered(self, gatt):
if gatt == QBluetoothUuid(QBluetoothUuid.ServiceClassUuid.HeartRate):
self.info = "Heart Rate service discovered. Waiting for service scan to be done..."
self.m_foundHeartRateService = True
#! [Filter HeartRate service 1]
@Slot()
def serviceScanDone(self):
self.info = "Service scan done."
# Delete old service if available
if self.m_service:
self.m_service = None
#! [Filter HeartRate service 2]
# If heartRateService found, create new service
if self.m_foundHeartRateService:
self.m_service = self.m_control.createServiceObject(QBluetoothUuid(QBluetoothUuid.ServiceClassUuid.HeartRate), self)
if self.m_service:
self.m_service.stateChanged.connect(self.serviceStateChanged)
self.m_service.characteristicChanged.connect(self.updateHeartRateValue)
self.m_service.descriptorWritten.connect(self.confirmedDescriptorWrite)
self.m_service.discoverDetails()
else:
self.error = "Heart Rate Service not found."
#! [Filter HeartRate service 2]
# Service functions
#! [Find HRM characteristic]
@Slot(QLowEnergyService.ServiceState)
def serviceStateChanged(self, switch):
if switch == QLowEnergyService.RemoteServiceDiscovering:
self.setInfo(tr("Discovering services..."))
elif switch == QLowEnergyService.RemoteServiceDiscovered:
self.setInfo(tr("Service discovered."))
hrChar = m_service.characteristic(QBluetoothUuid(QBluetoothUuid.CharacteristicType.HeartRateMeasurement))
if hrChar.isValid():
self.m_notificationDesc = hrChar.descriptor(QBluetoothUuid.DescriptorType.ClientCharacteristicConfiguration)
if self.m_notificationDesc.isValid():
self.m_service.writeDescriptor(m_notificationDesc,
QByteArray.fromHex(b"0100"))
else:
self.error = "HR Data not found."
self.aliveChanged.emit()
#! [Find HRM characteristic]
#! [Reading value]
@Slot(QLowEnergyCharacteristic, QByteArray)
def updateHeartRateValue(self, c, value):
# ignore any other characteristic change. Shouldn't really happen though
if c.uuid() != QBluetoothUuid(QBluetoothUuid.CharacteristicType.HeartRateMeasurement):
return
data = value.data()
flags = int(data[0])
# Heart Rate
hrvalue = 0
if flags & 0x1: # HR 16 bit little endian? otherwise 8 bit
hrvalue = struct.unpack("<H", data[1:3])
else:
hrvalue = struct.unpack("B", data[1:2])
self.addMeasurement(hrvalue)
#! [Reading value]
@Slot()
def updateDemoHR(self):
randomValue = 0
if self.m_currentValue < 30: # Initial value
randomValue = 55 + QRandomGenerator.global_().bounded(30)
elif not self.m_measuring: # Value when relax
random = QRandomGenerator.global_().bounded(5)
randomValue = self.m_currentValue - 2 + random
randomValue = max(min(randomValue, 55), 75)
else: # Measuring
random = QRandomGenerator.global_().bounded(10)
randomValue = self.m_currentValue + random - 2
self.addMeasurement(randomValue)
@Slot(QLowEnergyCharacteristic, QByteArray)
def confirmedDescriptorWrite(self, d, value):
if (d.isValid() and d == self.m_notificationDesc
and value == QByteArray.fromHex(b"0000")):
# disabled notifications . assume disconnect intent
self.m_control.disconnectFromDevice()
self.m_service = None
@Slot()
def disconnectService(self):
self.m_foundHeartRateService = False
# disable notifications
if (self.m_notificationDesc.isValid() and self.m_service
and self.m_notificationDesc.value() == QByteArray.fromHex(b"0100")):
self.m_service.writeDescriptor(self.m_notificationDesc,
QByteArray.fromHex(b"0000"))
else:
if self.m_control:
self.m_control.disconnectFromDevice()
self.m_service = None
@Property(bool, notify=measuringChanged)
def measuring(self):
return self.m_measuring
@Property(bool, notify=aliveChanged)
def alive(self):
if simulator:
return True
if self.m_service:
return self.m_service.state() == QLowEnergyService.RemoteServiceDiscovered
return False
@Property(int, notify=statsChanged)
def hr(self):
return self.m_currentValue
@Property(int, notify=statsChanged)
def time(self):
return self.m_start.secsTo(self.m_stop)
@Property(int, notify=statsChanged)
def maxHR(self):
return self.m_max
@Property(int, notify=statsChanged)
def minHR(self):
return self.m_min
@Property(float, notify=statsChanged)
def average(self):
return self.m_avg
@Property(float, notify=statsChanged)
def calories(self):
return self.m_calories
def addMeasurement(self, value):
self.m_currentValue = value
# If measuring and value is appropriate
if self.m_measuring and value > 30 and value < 250:
self.m_stop = QDateTime.currentDateTime()
self.m_measurements.append(value)
self.m_min = value if self.m_min == 0 else min(value, self.m_min)
self.m_max = max(value, self.m_max)
self.m_sum += value
self.m_avg = float(self.m_sum) / len(self.m_measurements)
self.m_calories = ((-55.0969 + (0.6309 * self.m_avg) + (0.1988 * 94)
+ (0.2017 * 24)) / 4.184) * 60 * self.time / 3600
self.statsChanged.emit()
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