How I could send AT command and Key character to QserialPort?

Dang Vu

Hi everyone! i'am Vu( VietNammese!) i have a project with moden 3G-Module GSM! and i wan't to send AT command to ComPort( enviroment WinDown8), i have a example "Terminal" in QT example( QT Creator 5.7) this link about project: http://doc.qt.io/qt-5/qtserialport-terminal-example.html . And to day, i want send AT command auto, i don't much push the "Key enter" when i over the command! one a code in mainwindown.cpp ( line 156):

void MainWindow::writeData(const QByteArray &data)
{
    serial->write(data);
}

I much press the key Enter when i over the one command! I don't know how to send the Key chacracter Ctrl+Z and character " Enter". same like: "serial->write("\n") or "serial->write('10')... Thanks for read!

mostefa

Hi @Dang-Vu

Not sure i understand what do you want, but if you want to send command automatically without press any key you can use QTimer,

Take a look at QTimer doc:

http://doc.qt.io/qt-5/qtimer.html#details

you can use for example:

QTimer *timer = new QTimer(this);
connect(timer, SIGNAL(timeout()), this, SLOT(writeData()));
timer->start(1000);

Here you send AT command every seconds,

Hope this can help you,

J.Hilk

@Dang-Vu

Hello Dang-Vu and welcome,

I'm afraid I don't really understand your question/problem,

but to catch for example the "Enter-Key" beeing pressed in your programm,
you can reimplement the function keyPressEvent:

protected:
void keyPressEvent(QKeyEvent *ev){
    if (ev->type() == Qt::Key_Return || ev->type() == Qt::Key_Enter){
         //Do Stuff
    }
}

Dang Vu

@mostefa Firt of all, Thanks for you reply! about "auto", which mean i want

serial->write("AT");
serial->waitForBytesWritten(1000);
serial->waitForReadyRead(1000);

serial->write("AT+CMGW=1");
serial->waitForBytesWritten(1000);
serial->waitForReadyRead(1000);

in here, i want to send a Key Enter and keystrokes Ctrl+Z to ComPort,.... serial->write("QTKEY::Enter"); because when i over every command, i must the press Enter to send AT to serial! examp: AT Enter
AT+CMGW=1 Enter

Dang Vu

@J.Hilk said in How I could send AT command and Key character to QserialPort?:

he "Enter-Key" beeing pressed in your programm,
you can reimplement the function keyPressEvent:
protected:
void keyPressEvent(QKeyEvent *ev){
if (ev->type() == Qt::Key_Return || ev->type() == Qt::Key_Enter){
//Do Stuff

you stand me! ecxactly, i want send the Qt::Key_Enter to COM16. Now, i send the command serial->write(data); you can see here link: http://doc.qt.io/qt-5/qtserialport-terminal-example.html ......when i write the AT command in Qplantext( black Desktop in center Widget) i must press the Enter to complete! example: AT Enter
Now, i want to send the Enter key by code: serial->write("Enter Key" ); Thanks for your reply

Zakaria Chahboun

in c++ the CTRL+Z is '\x1A' character.

//your code here
char ctr_z = '\x1A';