1.要使用qt蓝牙模块, 项目的 .pro要声明使用
2.有了lambda函数后，不用再一个个声明和创建具名槽函数的感觉挺好，就是代码成一坨了
3.虽然说是低功耗蓝牙，但还是要记得用完后断开和外设店连接，之前忘记断开，一晚上一个纽扣电池的点就被耗光了
4.GATT Profile 简介
- 搜寻附近全部的蓝牙设备
- 根据搜寻出的蓝牙设备信息，筛选出要连接的蓝牙设备进行连接
- 建立连接后，去获取该蓝牙设备等services列表，根据约定好的服务uuid筛选出自己需要的服务
- 发现对应的服务后，根据约定好的服务下characteristic特性id,创建特征对象，并监听特征对象内容的变化
- 向客户端特征配置对象写入特征生效消息，开始接收外围蓝牙设备。
bluedevice.h:
1 #ifndef BLUEDEVICE_H 2 #define BLUEDEVICE_H
3 #include <QObject>
4 #include<QBluetoothDeviceDiscoveryAgent>
5 #include<QBluetoothDeviceInfo>
6 #include<QBluetoothUuid>
7 #include<QBluetoothServiceInfo>
8 #include<QLowEnergyController>
9 #include<QLowEnergyService>
10 #include<QLowEnergyDescriptor>
11 class BlueDevice: public QObject{ 12 Q_OBJECT 13 public: 14
15 BlueDevice(); 16 QString getAddress(QBluetoothDeviceInfo device) const; 17 private: 18 QList<QBluetoothDeviceInfo> device_list; //存放搜索到到蓝牙设备列表
19 QBluetoothDeviceDiscoveryAgent *m_deviceDiscoveryAgent; //设备搜索对象
20 QLowEnergyController *m_controler; //单个蓝牙设备控制器
21 QLowEnergyService *m_service; //服务对象实例
22 }; 23
24 #endif // BLUEDEVICE_H
bluedevice.cpp:
1 #include "bluedevice.h"
2 #include <QDebug>
3 #include<QTimer>
4
5 BlueDevice::BlueDevice() { 6 qDebug() << "enter bludedevice constructor...."; 7
8 m_deviceDiscoveryAgent = new QBluetoothDeviceDiscoveryAgent(this); 9 m_deviceDiscoveryAgent->setLowEnergyDiscoveryTimeout(5000); 10
11 //每次发现新设备时触发
12 connect(m_deviceDiscoveryAgent, &QBluetoothDeviceDiscoveryAgent::deviceDiscovered, this ,[this]() { 13 qDebug() << "find a new bluebooth device"; 14 }); 15
16 //蓝牙设备搜索完成后，筛选出目标设备进行连接，并进行相关信号与槽函数的绑定
17 connect(m_deviceDiscoveryAgent,&QBluetoothDeviceDiscoveryAgent::finished, this, [this]() { 18 device_list = this->m_deviceDiscoveryAgent->discoveredDevices(); 19
20 //遍历显示设备详情
21 QList<QBluetoothDeviceInfo>::iterator it; 22 for(it=device_list.begin(); it != device_list.end(); it++) { 23
24 // 外围蓝牙设备对象
25 QBluetoothDeviceInfo tmp_device = *it; 26 QString device_name = tmp_device.name(); 27 //qDebug() <<"device name:::" << device_name; 28 //qDebug() << "device address:::" << this->getAddress(tmp_device); 29
30 //打印搜索出来的全部低功耗蓝牙
31 if (tmp_device.coreConfigurations() & QBluetoothDeviceInfo::LowEnergyCoreConfiguration) { 32 qDebug() << " low Energy device ...."; 33 qDebug() <<"22222device name:::" << device_name; 34 } 35
36 //正则匹配目标设备，
37 QString pattern_str = "^Eric.*"; //qt中正则匹配任意个字符，需要使用.*而不是*
38 QRegExp rx(pattern_str); 39 if(!rx.exactMatch(device_name)) { 40 continue; 41 } 42 qDebug() <<"device name:::" << device_name; 43 qDebug() << "device address:::" << this->getAddress(tmp_device); 44
45 // 创建蓝牙设备控制器对象
46 m_controler = new QLowEnergyController(tmp_device, this); 47
48 // 监听目标设备连接成功消息，连接成功后，搜索目标设备等服务列表
49 connect(m_controler, &QLowEnergyController::connected, this, [this](){ 50 qDebug() << "m_controler connected ......"; 51 //必须要在连接建立后 执行开始寻找service的函数 52 //之前调试，就是因为没有在设备连接后主动请求获取服务列表信息，后续监听便没有触发
53 m_controler->discoverServices(); 54 }); 55
56 // 监听发现服务消息，如果服务的uuid 为约定好的要使用服务类型，则进行后续处理
57 connect(m_controler,&QLowEnergyController::serviceDiscovered, this, [this](QBluetoothUuid serviceUuid) { 58 if(serviceUuid == QBluetoothUuid( quint16(0xffd0))) { //我们用的服务类型是0xffd0对应的uuid 59
60 //发现匹配的服务后，使用控制器对象创建服务对象
61 m_service = m_controler->createServiceObject(serviceUuid,this); 62 if(m_service) { 63
64 // 服务对象创建成功后，坚挺服务状态变化，如果状态变成已发现，则进行后续服务下特征对象获取
65 connect(m_service,&QLowEnergyService::stateChanged, this, [this]() { 66 qDebug() << "service state change" << m_service->state() << ",||||||"; 67
68 //发现服务, 建立characteristic对象实例
69 if(m_service->state() == QLowEnergyService::ServiceDiscovered) { 70 QLowEnergyCharacteristic hrChar = m_service->characteristic(QBluetoothUuid(quint16(0xfff6))); 71 if(!hrChar.isValid()) { 72 qDebug() << "characteristic fff6 error:::"; 73 } 74 // 设置特征对象可用 75 //enable the chracteristic notification by write 0x01 to client characteristic configuration
76 QLowEnergyDescriptor m_notificationDesc = hrChar.descriptor(QBluetoothUuid::ClientCharacteristicConfiguration); 77 if (m_notificationDesc.isValid()) { 78 if(hrChar.properties() & QLowEnergyCharacteristic::Notify) { 79 qDebug() << ""; 80 } 81 m_service->writeDescriptor(m_notificationDesc, QByteArray::fromHex("0100")); 82 } 83 } 84 }); 85
86 // 通过监听特征对象的变化，不断获得鞋垫压力数据。
87 connect(m_service,&QLowEnergyService::characteristicChanged, this, 88 [this](QLowEnergyCharacteristic c,QByteArray value) { 89 qDebug() << "characteristicChanged state change::" <<c.uuid()<< ",||||||"; 90 qDebug() << "value length::" << value.length(); 91 qDebug() << "value length::" << value; 92
93 QByteArray sub_1 = value.mid(0,2); 94 QByteArray sub_2 = value.mid(2,2); 95 QByteArray sub_3 = value.mid(4,2); 96
97 bool ok; 98 // num 1,2,3 分别对应三个压力感应点的压力值
99 int num_1 = QString(sub_1.toHex()).toInt(&ok,16); 100 qDebug() << "num_1:::" << num_1; 101 int num_2 = QString(sub_2.toHex()).toInt(&ok,16); 102 qDebug() << "num_1:::" << num_2; 103 int num_3 = QString(sub_3.toHex()).toInt(&ok,16); 104 qDebug() << "num_1:::" << num_3; 105
106 } 107 ); 108
109 // 触发服务详情发现函数 ，不要忘记调用
110 m_service->discoverDetails(); 111 } 112 } 113 }); 114
115 connect(m_controler,&QLowEnergyController::discoveryFinished, this, [this]() { 116 qDebug() << "finish service discovery"; 117 }); 118
119 //连接外围设备
120 m_controler->connectToDevice(); 121
122 //QTimer *timer = new QTimer(this); 123 //connect(timer, &QTimer::timeout, this, [this](){ qDebug() <<"state:::" << this->m_controler->state();}); 124 //timer->start(1000);
125 } 126 }); 127
128 // 开始外围设备搜索
129 m_deviceDiscoveryAgent->start(); 130
131 } 132
133 // mac和其他系统上address获取有少许差异，参见官方文档
134 QString BlueDevice::getAddress(QBluetoothDeviceInfo device) const
135 { 136 #ifdef Q_OS_MAC 137 // On OS X and iOS we do not have addresses, 138 // only unique UUIDs generated by Core Bluetooth.
139 return device.deviceUuid().toString(); 140 #else
141 return device.address().toString(); 142 #endif
143 } 144
145 //void BlueDevice::getNewService(QBluetoothServiceInfo info) { 146 // qDebug() << "ppppp uuuuuuuuuu"; 147 //}