mainwindow.h Example File

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  #ifndef MAINWINDOW_H
  #define MAINWINDOW_H

  #include <QButtonGroup>
  #include <QMainWindow>
  #include <QModbusServer>

  class QLineEdit;

  namespace Ui {
  class MainWindow;
  class SettingsDialog;
  }


  class SettingsDialog;

  class MainWindow : public QMainWindow
  {
      Q_OBJECT

  public:
      explicit MainWindow(QWidget *parent = nullptr);
      ~MainWindow();

  private Q_SLOTS:
      void on_connectButton_clicked();
      void onStateChanged(int state);

      void coilChanged(int id);
      void discreteInputChanged(int id);
      void bitChanged(int id, QModbusDataUnit::RegisterType table, bool value);

      void setRegister(const QString &value);
      void updateWidgets(QModbusDataUnit::RegisterType table, int address, int size);

      void on_connectType_currentIndexChanged(int);

      void handleDeviceError(QModbusDevice::Error newError);

  private:
      void initActions();
      void setupDeviceData();
      void setupWidgetContainers();

      Ui::MainWindow *ui;
      QModbusServer *modbusDevice;

      QButtonGroup coilButtons;
      QButtonGroup discreteButtons;
      QHash<QString, QLineEdit *> registers;
      SettingsDialog *m_settingsDialog;
  };

  #endif // MAINWINDOW_H