I am using QSerialPort Module for communicating with the Esp32 When the Esp32 requests the data Qt application gives the data it will work fine for around 4 hours but after some time Qserialport close unexpectedly.

However, When I Disconnect and reconnect Qserialport it will work again for around 4 hours and this cycle repeats.

Does anyone have any idea what's going on...

Here is my Code for the serial port.

m_serialport::m_serialport(QObject *parent)
: QObject{parent}
{

}

void m_serialport::init_Serial_Port()
{
m_serial = new QSerialPort();
}

uint8_t m_serialport::Open_Serial_Port()
{
m_serial->setPortName(Serial_Port_Settings.Port);
qDebug() << m_serial->setBaudRate(Serial_Port_Settings.baud);
m_serial->setDataBits(Serial_Port_Settings.dataBits);
m_serial->setParity(Serial_Port_Settings.parity);
m_serial->setStopBits(Serial_Port_Settings.stopBits);
m_serial->setFlowControl(QSerialPort::NoFlowControl);

if (m_serial->open(QIODevice::ReadWrite)) {

    return QSerialPort::NoError;

} else {

    Serial_Port_Error_String = m_serial->errorString();

    return QSerialPort::DeviceNotFoundError;

}

return QSerialPort::DeviceNotFoundError;

}

void m_serialport::Close_Serial_Port()
{
m_serial->close();
}

int ack_count =0;
QByteArray data ="";

void m_serialport::Read__data()
{

qDebug() << "Serial running " << QThread::currentThread();

QByteArray serial_data = m_serial->readAll();

qDebug() << " data =  " << serial_data;
qDebug() << " last =  " << serial_data[serial_data.size()-1];

if(serial_data[serial_data.size()-1] == '#')
{
    serial_data[serial_data.size()-1] = ' ';
    if(serial_data[0] == '@')
    {
        data = serial_data;
    }
    else
    {
        data.append(serial_data);
    }
    data[0] = ' ';

    QJsonObject data_json ;

    QJsonDocument jsonDocument = QJsonDocument::fromJson(data);

    if (!jsonDocument.isNull() && jsonDocument.isObject())
    {
        data_json = jsonDocument.object();
    }
    qDebug() << data_json;
  
    if(data_json.contains("Request") == true  && data_json.value("Request").toString() == "DATA")
    {
    
          // logic portion that will collect data from JSON object and make packet 

                QJsonValue value = jsonDoc.object().value(key);
                if( jsonDoc.object().value(key).isObject())
                {    qDebug() << "Key = " << key << "is group ";
                    foreach(const QString& key1, jsonDoc.object().value(key).toObject().keys()) {
                        QJsonValue value1 = jsonDoc.object().value(key).toObject().value(key1);
                        qDebug() << "Key = " << key1 << ", Value = " << value1.toString();
                    }
                }
                else
                {
                    qDebug() << "Key = " << key << ", Value = " << value.toString();
                }
            
            m_serial->write(jsonDoc.toJson(QJsonDocument::Compact) + '\0');
        

    }
    else
    {
        DATA_Read->Add_Modbus_write_string(data);
    }
}
else
{
    if(serial_data[0] == '@')
    {
        data = serial_data;
    }
    else if(serial_data[0] != '@')
    {
        data.append(serial_data);
    }
}

}