Hints to design threaded serial-reader/writer interface ?

[oldFox64]

Already created a GUI-program that reads & writes (mostly writes) through serial port with an event loop. I managed more or less that the GUI be responsive but logically the right way is to use threads. So my intention is to move the reading & writing of serial port on a separate thread.

What I have until now:

class SerialIO : public QThread
{
    Q_OBJECT
 
public:
    SerialIO(QObject *parent = 0);
    ~SerialIO();
    void run();                     
    void addData(const QByteArray); //to out_buffer
    const QByteArray getData();     //from in_buffer
 
signals:
    //not sure...
    void readyToSend();    
    void readyToRecv();
 
public slots:
    void send();
    void recv();    
 
private:
    QSerialPort *serial;
    QBuffer out_buffer;
    QBuffer in_buffer;
 
 
};

class SerialIO : public QThread
{
    Q_OBJECT
    
public:
    SerialIO(QObject *parent = 0);
    ~SerialIO();
    void run();                     
    void addData(const QByteArray); //to out_buffer
    const QByteArray getData();     //from in_buffer

signals:
    //not sure...
    void readyToSend();    
    void readyToRecv();

public slots:
    void send();
    void recv();    

private:
    QSerialPort *serial;
    QBuffer out_buffer;
    QBuffer in_buffer;
    

};

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As the main task is to write a file through the serial port, my idea is to inject the file line by line, filling the buffer and the thread class will send it at his own pace. What I receive are ACK's basically.