qt wifi mesh 中节点自组网代码

以下是一个基于 Qt 的 WiFi Mesh 自组网示例代码：

#include <QCoreApplication>
#include <QNetworkConfigurationManager>
#include <QNetworkSession>
#include <QProcess>
#include <QTimer>
#include <QSocketNotifier>
#include <QDebug>

// WiFi Mesh 自组网示例代码

#define CONFIG_FILE "/etc/wpa_supplicant.conf"
#define CONFIG_TEMPLATE "ctrl_interface=/var/run/wpa_supplicant\n\
update_config=1\n\
\n\
network={\n\
    ssid=\"%1\"\n\
    mode=1\n\
    frequency=2412\n\
    proto=RSN\n\
    key_mgmt=WPA-PSK\n\
    pairwise=CCMP\n\
    group=CCMP\n\
    psk=\"%2\"\n\
}"

class Node : public QObject
{
    Q_OBJECT
public:
    Node(const QString& name, const QString& ssid, const QString& password);

public slots:
    void start();
    void stop();

private slots:
    void readStdout();
    void readStderr();
    void processError(QProcess::ProcessError error);
    void processFinished(int exitCode, QProcess::ExitStatus exitStatus);
    void networkSessionOpened();
    void networkSessionClosed();
    void socketActivated(int fd);

private:
    QString m_name;
    QString m_ssid;
    QString m_password;
    QString m_configFilePath;
    QProcess m_process;
    QNetworkConfigurationManager m_networkConfigManager;
    QNetworkSession* m_networkSession;
    QTimer m_timer;
    QSocketNotifier* m_socketNotifier;
};

Node::Node(const QString& name, const QString& ssid, const QString& password)
    : QObject(nullptr)
    , m_name(name)
    , m_ssid(ssid)
    , m_password(password)
    , m_configFilePath(QString("/etc/wpa_supplicant-%1.conf").arg(name))
    , m_process(this)
    , m_networkConfigManager(this)
    , m_networkSession(nullptr)
    , m_timer(this)
    , m_socketNotifier(nullptr)
{
    connect(&m_process, &QProcess::readyReadStandardOutput, this, &Node::readStdout);
    connect(&m_process, &QProcess::readyReadStandardError, this, &Node::readStderr);
    connect(&m_process, static_cast<void(QProcess::*)(int, QProcess::ExitStatus)>(&QProcess::finished), this, &Node::processFinished);
    connect(&m_process, &QProcess::errorOccurred, this, &Node::processError);
    connect(&m_networkConfigManager, &QNetworkConfigurationManager::onlineStateChanged, this, &Node::networkSessionClosed);
    connect(&m_timer, &QTimer::timeout, this, &Node::start);
}

void Node::start()
{
    if (m_networkSession && m_networkSession->isOpen()) {
        qDebug() << "Node" << m_name << "is already connected to the network";
        return;
    }

    qDebug() << "Starting node" << m_name << "...";

    // Write the configuration file for this node
    QFile configFile(m_configFilePath);
    if (configFile.open(QIODevice::WriteOnly | QIODevice::Text)) {
        QTextStream out(&configFile);
        out << QString(CONFIG_TEMPLATE).arg(m_ssid).arg(m_password);
        configFile.close();
    } else {
        qCritical() << "Error writing configuration file for node" << m_name;
        return;
    }

    // Start the wpa_supplicant process
    QStringList arguments;
    arguments << "-Dnl80211" << "-c" << m_configFilePath;
    m_process.start("wpa_supplicant", arguments);

    // Wait for the process to start and create the control socket
    if (m_process.waitForStarted()) {
        m_socketNotifier = new QSocketNotifier(m_process.handle(), QSocketNotifier::Read, this);
        connect(m_socketNotifier, &QSocketNotifier::activated, this, &Node::socketActivated);
    } else {
        qCritical() << "Error starting wpa_supplicant for node" << m_name;
    }

    // Wait for the network session to be opened
    if (!m_networkSession) {
        m_networkSession = new QNetworkSession(m_networkConfigManager.defaultConfiguration(), this);
        connect(m_networkSession, &QNetworkSession::opened, this, &Node::networkSessionOpened);
        connect(m_networkSession, &QNetworkSession::closed, this, &Node::networkSessionClosed);
    } else {
        networkSessionOpened();
    }
}

void Node::stop()
{
    qDebug() << "Stopping node" << m_name << "...";

    // Stop the wpa_supplicant process
    m_process.terminate();
    if (!m_process.waitForFinished(5000)) {
        m_process.kill();
    }

    // Delete the configuration file for this node
    QFile::remove(m_configFilePath);

    // Close the network session
    if (m_networkSession) {
        m_networkSession->close();
    }
}

void Node::readStdout()
{
    qDebug() << "Node" << m_name << "stdout:" << m_process.readAllStandardOutput();
}

void Node::readStderr()
{
    qWarning() << "Node" << m_name << "stderr:" << m_process.readAllStandardError();
}

void Node::processError(QProcess::ProcessError error)
{
    qCritical() << "Node" << m_name << "process error:" << error << m_process.errorString();
}

void Node::processFinished(int exitCode, QProcess::ExitStatus exitStatus)
{
    qDebug() << "Node" << m_name << "process finished with exit code" << exitCode << "and exit status" << exitStatus;
}

void Node::networkSessionOpened()
{
    qDebug() << "Node" << m_name << "network session opened:" << m_networkSession->isOpen();
}

void Node::networkSessionClosed()
{
    qDebug() << "Node" << m_name << "network session closed:" << !m_networkSession->isOpen();
    m_networkSession = nullptr;
    m_socketNotifier = nullptr;
    m_timer.start(1000);
}

void Node::socketActivated(int fd)
{
    char buffer[1024];
    int length = read(fd, buffer, sizeof(buffer));
    if (length > 0) {
        qDebug() << "Node" << m_name << "control socket message:" << QString::fromUtf8(buffer, length);
    }
}

int main(int argc, char *argv[])
{
    QCoreApplication a(argc, argv);

    // Start the nodes
    Node node1("node1", "mesh", "password");
    Node node2("node2", "mesh", "password");
    Node node3("node3", "mesh", "password");
    node1.start();
    node2.start();
    node3.start();

    // Stop the nodes after 10 seconds
    QTimer::singleShot(10000, &node1, &Node::stop);
    QTimer::singleShot(10000, &node2, &Node::stop);
    QTimer::singleShot(10000, &node3, &Node::stop);

    return a.exec();
}

#include "main.moc"

在上面的示例代码中，我们定义了一个 Node 类，它代表一个 WiFi Mesh 网络中的节点。在 Node 类的构造函数中，我们传入了节点的名称、SSID 和密码，同时生成了一个节点专用的 wpa_supplicant 配置文件。在 Node 类的 start() 方法中，我们启动了 wpa_supplicant 进程，并且等待它创建控制套接字。我们还创建了一个 QNetworkSession 对象，用于连接到 WiFi 网络，等待连接成功后，我们就可以使用这个节点了。在 Node 类的 stop() 方法中，我们停止了 wpa_supplicant 进程，并且删除了节点专用的 wpa_supplicant 配置文件。