Unsolved Problem with QSerialPort

[AngrySkarpeta]

Hi,
I tried to open port (i want to send letter 'F' to arduino via bluetooth) but immediately i get error "Semaphore limit exceeded " (it can be a little bit different because i get error in my language ).
Below i post part of the code

        serial.setPortName("COM6");
        if(!serial.open(QIODevice::ReadOnly)){
        QMessageBox::critical(this, tr("Error"), serial.errorString());
        return;}
               serial.setBaudRate(9600);
               serial.setDataBits(QSerialPort::Data8);
               serial.setParity(QSerialPort::NoParity);
               serial.setStopBits(QSerialPort::OneStop);
               serial.setFlowControl(QSerialPort::NoFlowControl);
                if (serial.isOpen() && serial.isWritable()){
                       qDebug() << "Serial is open";

It would be awesome if someon could help me.

[A Former User]

Hi! Have you tried to run one of the Qt Serial Port Examples?

[AngrySkarpeta]

@Wieland Yes i tried one of them, also tried project blubot from github. It seems to be problem not with code but with windows, does you ever encouter something like that?

[mrjj]

Hi
Did you try other function of BT ?
Are the board and the pc connected`?

You could also try
http://doc.qt.io/qt-5/qtbluetooth-btfiletransfer-example.html

[AngrySkarpeta]

Pc and arduino are connected :-) I was thinking about using qbluetooth but it seems to be excesive if i want just send letter ;-)

[mrjj]

@AngrySkarpeta
Well it might be overkill
but it´sounds like its not really connected but
without actual errors then its not possible to guess at all.
Could be a driver issue or trust issue.
You should use other tools to try to test if they are really paired.

[kuzulis]

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