Serial read misses to read data from the serial port

[mania]

anda_skoa:I read the data using readall which returns 0 bytes as the return value

nBytesReceived1=m_serialportCoProcessor->readAll();
qDebug()<<"rec1"<<nBytesReceived1.count();

How did you determine that your code snippet doesn't show.

Again, using readAll() will give you both the check and the data in one go

const QByteArray data = m_serialportCoProcessor->readAll();
// check if there was data available
if (data.count() > 0){
   // do something with the data
   qDebug() << "received" << data.count() << "bytes";
}

const QByteArray data = m_serialportCoProcessor->readAll();
// check if there was data available
if (data.count() > 0){
   // do something with the data
   qDebug() << "received" << data.count() << "bytes";
}

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Cheers,
_