linux qt bluetoothctl蓝牙主动配对和被动配对demo

在Linux系统上使用Qt进行蓝牙主动配对和被动配对可以使用bluez库和bluetoothctl工具。下面是一个简单的示例代码：

### 主动配对

#include <QProcess>

void pairBluetoothDevice(const QString& deviceAddress, const QString& pinCode)
{
    QProcess process;
    process.start("bluetoothctl");

    if (!process.waitForStarted())
        return;

    process.write("connect " + deviceAddress.toUtf8() + "\n");
    process.waitForReadyRead();

    process.write("pair " + deviceAddress.toUtf8() + "\n");
    process.waitForReadyRead();

    process.write(pinCode.toUtf8() + "\n");
    process.waitForReadyRead();

    process.write("exit\n");
    process.waitForFinished();
}

### 被动配对

#include <QBluetoothLocalDevice>
#include <QBluetoothDeviceDiscoveryAgent>
#include <QBluetoothDevice>
#include <QBluetoothUuid>

class BluetoothManager : public QObject
{
    Q_OBJECT

public:
    BluetoothManager(QObject *parent = nullptr)
        : QObject(parent)
    {
        m_localDevice = new QBluetoothLocalDevice(this);
        connect(m_localDevice, &QBluetoothLocalDevice::pairingFinished, this, &BluetoothManager::onPairingFinished);

        m_discoveryAgent = new QBluetoothDeviceDiscoveryAgent(this);
        connect(m_discoveryAgent, &QBluetoothDeviceDiscoveryAgent::deviceDiscovered, this, &BluetoothManager::onDeviceDiscovered);
        connect(m_discoveryAgent, &QBluetoothDeviceDiscoveryAgent::finished, this, &BluetoothManager::onDeviceDiscoveryFinished);

        m_localDevice->setHostMode(QBluetoothLocalDevice::HostDiscoverable);
        m_discoveryAgent->start();
    }

private slots:
    void onPairingFinished(const QBluetoothAddress& address, QBluetoothLocalDevice::Pairing pairing)
    {
        if (pairing == QBluetoothLocalDevice::Paired)
            qDebug() << "Device paired successfully: " << address.toString();
        else
            qDebug() << "Device pairing failed: " << address.toString();
    }

    void onDeviceDiscovered(const QBluetoothDeviceInfo& device)
    {
        if (device.coreConfigurations() & QBluetoothDeviceInfo::LowEnergyCoreConfiguration)
        {
            qDebug() << "Found BLE device: " << device.name() << " (" << device.address().toString() << ")";

            if (device.name() == "My BLE Device")
            {
                qDebug() << "Pairing with the device...";

                m_discoveryAgent->stop();

                if (!m_localDevice->pairingStatus(device.address()))
                    m_localDevice->requestPairing(device.address(), QBluetoothLocalDevice::Paired);
            }
        }
    }

    void onDeviceDiscoveryFinished()
    {
        qDebug() << "Device discovery finished.";
    }

private:
    QBluetoothLocalDevice* m_localDevice;
    QBluetoothDeviceDiscoveryAgent* m_discoveryAgent;
};

注意：被动配对需要先启用本地蓝牙设备的可发现性，然后才能进行设备发现和配对。此外，被动配对通常用于低功耗蓝牙（BLE）设备，而不是传统的蓝牙设备。