1.要使用qt藍牙模塊, 項目的 .pro要聲明使用
2.有了lambda函數后，不用再一個個聲明和創建具名槽函數的感覺挺好，就是代碼成一坨了
3.雖然說是低功耗藍牙，但還是要記得用完后斷開和外設店連接，之前忘記斷開，一晚上一個紐扣電池的點就被耗光了
4.GATT Profile 簡介
- 搜尋附近全部的藍牙設備
- 根據搜尋出的藍牙設備信息，篩選出要連接的藍牙設備進行連接
- 建立連接后，去獲取該藍牙設備等services列表，根據約定好的服務uuid篩選出自己需要的服務
- 發現對應的服務后，根據約定好的服務下characteristic特性id,創建特征對象，並監聽特征對象內容的變化
- 向客戶端特征配置對象寫入特征生效消息，開始接收外圍藍牙設備。
bluedevice.h:
#ifndef BLUEDEVICE_H #define BLUEDEVICE_H #include <QObject> #include<QBluetoothDeviceDiscoveryAgent> #include<QBluetoothDeviceInfo> #include<QBluetoothUuid> #include<QBluetoothServiceInfo> #include<QLowEnergyController> #include<QLowEnergyService> #include<QLowEnergyDescriptor> class BlueDevice: public QObject{ Q_OBJECT public: BlueDevice(); QString getAddress(QBluetoothDeviceInfo device) const; private: QList<QBluetoothDeviceInfo> device_list; //存放搜索到到藍牙設備列表 QBluetoothDeviceDiscoveryAgent *m_deviceDiscoveryAgent; //設備搜索對象 QLowEnergyController *m_controler; //單個藍牙設備控制器 QLowEnergyService *m_service; //服務對象實例 }; #endif // BLUEDEVICE_H
bluedevice.cpp:
#include "bluedevice.h" #include <QDebug> #include<QTimer> BlueDevice::BlueDevice() { qDebug() << "enter bludedevice constructor...."; m_deviceDiscoveryAgent = new QBluetoothDeviceDiscoveryAgent(this); m_deviceDiscoveryAgent->setLowEnergyDiscoveryTimeout(5000); //每次發現新設備時觸發 connect(m_deviceDiscoveryAgent, &QBluetoothDeviceDiscoveryAgent::deviceDiscovered, this ,[this]() { qDebug() << "find a new bluebooth device"; }); //藍牙設備搜索完成后，篩選出目標設備進行連接，並進行相關信號與槽函數的綁定 connect(m_deviceDiscoveryAgent,&QBluetoothDeviceDiscoveryAgent::finished, this, [this]() { device_list = this->m_deviceDiscoveryAgent->discoveredDevices(); //遍歷顯示設備詳情 QList<QBluetoothDeviceInfo>::iterator it; for(it=device_list.begin(); it != device_list.end(); it++) { // 外圍藍牙設備對象 QBluetoothDeviceInfo tmp_device = *it; QString device_name = tmp_device.name(); //qDebug() <<"device name:::" << device_name; //qDebug() << "device address:::" << this->getAddress(tmp_device); //打印搜索出來的全部低功耗藍牙 if (tmp_device.coreConfigurations() & QBluetoothDeviceInfo::LowEnergyCoreConfiguration) { qDebug() << " low Energy device ...."; qDebug() <<"22222device name:::" << device_name; } //正則匹配目標設備， QString pattern_str = "^Eric.*"; //qt中正則匹配任意個字符，需要使用.*而不是* QRegExp rx(pattern_str); if(!rx.exactMatch(device_name)) { continue; } qDebug() <<"device name:::" << device_name; qDebug() << "device address:::" << this->getAddress(tmp_device); // 創建藍牙設備控制器對象 m_controler = new QLowEnergyController(tmp_device, this); // 監聽目標設備連接成功消息，連接成功后，搜索目標設備等服務列表 connect(m_controler, &QLowEnergyController::connected, this, [this](){ qDebug() << "m_controler connected ......"; //必須要在連接建立后 執行開始尋找service的函數 //之前調試，就是因為沒有在設備連接后主動請求獲取服務列表信息，后續監聽便沒有觸發 m_controler->discoverServices(); }); // 監聽發現服務消息，如果服務的uuid 為約定好的要使用服務類型，則進行后續處理 connect(m_controler,&QLowEnergyController::serviceDiscovered, this, [this](QBluetoothUuid serviceUuid) { if(serviceUuid == QBluetoothUuid( quint16(0xffd0))) { //我們用的服務類型是0xffd0對應的uuid //發現匹配的服務后，使用控制器對象創建服務對象 m_service = m_controler->createServiceObject(serviceUuid,this); if(m_service) { // 服務對象創建成功后，堅挺服務狀態變化，如果狀態變成已發現，則進行后續服務下特征對象獲取 connect(m_service,&QLowEnergyService::stateChanged, this, [this]() { qDebug() << "service state change" << m_service->state() << ",||||||"; //發現服務, 建立characteristic對象實例 if(m_service->state() == QLowEnergyService::ServiceDiscovered) { QLowEnergyCharacteristic hrChar = m_service->characteristic(QBluetoothUuid(quint16(0xfff6))); if(!hrChar.isValid()) { qDebug() << "characteristic fff6 error:::"; } // 設置特征對象可用 //enable the chracteristic notification by write 0x01 to client characteristic configuration QLowEnergyDescriptor m_notificationDesc = hrChar.descriptor(QBluetoothUuid::ClientCharacteristicConfiguration); if (m_notificationDesc.isValid()) { if(hrChar.properties() & QLowEnergyCharacteristic::Notify) { qDebug() << ""; } m_service->writeDescriptor(m_notificationDesc, QByteArray::fromHex("0100")); } } }); // 通過監聽特征對象的變化，不斷獲得鞋墊壓力數據。 connect(m_service,&QLowEnergyService::characteristicChanged, this, [this](QLowEnergyCharacteristic c,QByteArray value) { qDebug() << "characteristicChanged state change::" <<c.uuid()<< ",||||||"; qDebug() << "value length::" << value.length(); qDebug() << "value length::" << value; QByteArray sub_1 = value.mid(0,2); QByteArray sub_2 = value.mid(2,2); QByteArray sub_3 = value.mid(4,2); bool ok; // num 1,2,3 分別對應三個壓力感應點的壓力值 int num_1 = QString(sub_1.toHex()).toInt(&ok,16); qDebug() << "num_1:::" << num_1; int num_2 = QString(sub_2.toHex()).toInt(&ok,16); qDebug() << "num_1:::" << num_2; int num_3 = QString(sub_3.toHex()).toInt(&ok,16); qDebug() << "num_1:::" << num_3; } ); // 觸發服務詳情發現函數 ，不要忘記調用 m_service->discoverDetails(); } } }); connect(m_controler,&QLowEnergyController::discoveryFinished, this, [this]() { qDebug() << "finish service discovery"; }); //連接外圍設備 m_controler->connectToDevice(); //QTimer *timer = new QTimer(this); //connect(timer, &QTimer::timeout, this, [this](){ qDebug() <<"state:::" << this->m_controler->state();}); //timer->start(1000); } }); // 開始外圍設備搜索 m_deviceDiscoveryAgent->start(); } // mac和其他系統上address獲取有少許差異，參見官方文檔 QString BlueDevice::getAddress(QBluetoothDeviceInfo device) const { #ifdef Q_OS_MAC // On OS X and iOS we do not have addresses, // only unique UUIDs generated by Core Bluetooth. return device.deviceUuid().toString(); #else return device.address().toString(); #endif } //void BlueDevice::getNewService(QBluetoothServiceInfo info) { // qDebug() << "ppppp uuuuuuuuuu"; //}