1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
|
// Copyright (C) 2017 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause
#include <QtBluetooth/qlowenergyadvertisingdata.h>
#include <QtBluetooth/qlowenergyadvertisingparameters.h>
#include <QtBluetooth/qlowenergycharacteristic.h>
#include <QtBluetooth/qlowenergycharacteristicdata.h>
#include <QtBluetooth/qlowenergydescriptordata.h>
#include <QtBluetooth/qlowenergycontroller.h>
#include <QtBluetooth/qlowenergyservice.h>
#include <QtBluetooth/qlowenergyservicedata.h>
#include <QtCore/qbytearray.h>
#ifndef Q_OS_ANDROID
#include <QtCore/qcoreapplication.h>
#else
#include <QtGui/qguiapplication.h>
#endif
#include <QtCore/qlist.h>
#include <QtCore/qloggingcategory.h>
#include <QtCore/qscopedpointer.h>
#include <QtCore/qtimer.h>
int main(int argc, char *argv[])
{
// QLoggingCategory::setFilterRules(QStringLiteral("qt.bluetooth* = true"));
#ifndef Q_OS_ANDROID
QCoreApplication app(argc, argv);
#else
QGuiApplication app(argc, argv);
#endif
//! [Advertising Data]
QLowEnergyAdvertisingData advertisingData;
advertisingData.setDiscoverability(QLowEnergyAdvertisingData::DiscoverabilityGeneral);
advertisingData.setIncludePowerLevel(true);
advertisingData.setLocalName("HeartRateServer");
advertisingData.setServices(QList<QBluetoothUuid>() << QBluetoothUuid::ServiceClassUuid::HeartRate);
//! [Advertising Data]
//! [Service Data]
QLowEnergyCharacteristicData charData;
charData.setUuid(QBluetoothUuid::CharacteristicType::HeartRateMeasurement);
charData.setValue(QByteArray(2, 0));
charData.setProperties(QLowEnergyCharacteristic::Notify);
const QLowEnergyDescriptorData clientConfig(QBluetoothUuid::DescriptorType::ClientCharacteristicConfiguration,
QByteArray(2, 0));
charData.addDescriptor(clientConfig);
QLowEnergyServiceData serviceData;
serviceData.setType(QLowEnergyServiceData::ServiceTypePrimary);
serviceData.setUuid(QBluetoothUuid::ServiceClassUuid::HeartRate);
serviceData.addCharacteristic(charData);
//! [Service Data]
//! [Start Advertising]
bool errorOccurred = false;
const QScopedPointer<QLowEnergyController> leController(QLowEnergyController::createPeripheral());
auto errorHandler = [&leController,&errorOccurred](QLowEnergyController::Error errorCode)
{
qWarning().noquote().nospace() << errorCode << " occurred: "
<< leController->errorString();
if (errorCode != QLowEnergyController::RemoteHostClosedError) {
qWarning("Heartrate-server quitting due to the error.");
errorOccurred = true;
QCoreApplication::quit();
}
};
QObject::connect(leController.data(), &QLowEnergyController::errorOccurred, errorHandler);
QScopedPointer<QLowEnergyService> service(leController->addService(serviceData));
leController->startAdvertising(QLowEnergyAdvertisingParameters(), advertisingData,
advertisingData);
if (errorOccurred)
return -1;
//! [Start Advertising]
//! [Provide Heartbeat]
QTimer heartbeatTimer;
quint8 currentHeartRate = 60;
enum ValueChange { ValueUp, ValueDown } valueChange = ValueUp;
const auto heartbeatProvider = [&service, ¤tHeartRate, &valueChange]() {
QByteArray value;
value.append(char(0)); // Flags that specify the format of the value.
value.append(char(currentHeartRate)); // Actual value.
QLowEnergyCharacteristic characteristic
= service->characteristic(QBluetoothUuid::CharacteristicType::HeartRateMeasurement);
Q_ASSERT(characteristic.isValid());
service->writeCharacteristic(characteristic, value); // Potentially causes notification.
if (currentHeartRate == 60)
valueChange = ValueUp;
else if (currentHeartRate == 100)
valueChange = ValueDown;
if (valueChange == ValueUp)
++currentHeartRate;
else
--currentHeartRate;
};
QObject::connect(&heartbeatTimer, &QTimer::timeout, heartbeatProvider);
heartbeatTimer.start(1000);
//! [Provide Heartbeat]
auto reconnect = [&leController, advertisingData, &service, serviceData]()
{
service.reset(leController->addService(serviceData));
if (!service.isNull())
leController->startAdvertising(QLowEnergyAdvertisingParameters(),
advertisingData, advertisingData);
};
QObject::connect(leController.data(), &QLowEnergyController::disconnected, reconnect);
const int retval = QCoreApplication::exec();
return errorOccurred ? -1 : retval;
}
|
