MQTT 订阅范例

// Copyright (C) 2017 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause
#ifndef SUBSCRIPTIONWINDOW_H
#define SUBSCRIPTIONWINDOW_H
#include <QWidget>
#include <QtMqtt/QMqttMessage>
#include <QtMqtt/QMqttSubscription>
namespace Ui {
class SubscriptionWindow;
}
class SubscriptionWindow : public QWidget
{
    Q_OBJECT
public:
    explicit SubscriptionWindow(QMqttSubscription *sub, QWidget *parent = nullptr);
    ~SubscriptionWindow();
public slots:
    void updateMessage(const QMqttMessage &msg);
    void updateStatus(QMqttSubscription::SubscriptionState state);
private:
    Ui::SubscriptionWindow *ui;
    QMqttSubscription *m_sub;
};
#endif // SUBSCRIPTIONWINDOW_H