I included include(src/qextserialport.pri) in my pro file and added src directry to my project

I created one Dialog(Member to main class) to configure serial port and I popup from main Window an I used the following code in OK button

Qt Code: 
  1. void SerianConnectionDialog::on_btnOK_clicked()
  2. {
  3.     if (!port->isOpen()) {
  4.         port->setPortName(ui->portBox_2->currentText());
  5.         port->open(QIODevice::ReadWrite);
  6.     }
  7.  
  8.     //If using polling mode, we need a QTimer
  9.     if (port->isOpen() && port->queryMode() == QextSerialPort::Polling)
  10.         timer->start();
  11.      this->accept();
  12. }
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In My main class I concted the ready read of function


Qt Code: 
  1. void MainWindow::connectSerialPort()
  2. {
  3.  
  4.     if(QDialog::Accepted== dlg.exec())
  5.     {
  6.  
  7.  
  8.         this->port= dlg.port;
  9.         ui->led->turnOn(port->isOpen());
  10.  
  11.         timer->setInterval(40);
  12.  
  13.         connect(timer, SIGNAL(timeout()), SLOT(onReadyRead()));
  14.         connect(port, SIGNAL(readyRead()), SLOT(onReadyRead()));
  15.     }
  16. }
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And I coded to display data in a texedit

Qt Code: 
  1. void MainWindow::onReadyRead()
  2. {
  3.     if (port->bytesAvailable()) {
  4.         ui->textEdit->moveCursor(QTextCursor::End);
  5.         ui->textEdit->insertPlainText(QString::fromLatin1(port->readAll()));
  6.          ui->textEdit->insertPlainText(QString::fromLatin1("\n"));
  7.     }
  8. }
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But not showing any data from device. Any error in my code ?

The port showing open in Main class but not getting data to textbox
when I run CoolTerm application it showing the data correctly