unsigned int echoNumber = 0;
    for (unsigned int echoNumber = 0; echoNumber<500; ++echoNumber)
    {
        QByteArray echoString = QString("ECHO_NUMBER_%1").arg(echoNumber).toLocal8Bit();
        QByteArray cmdString = "ECHO " + echoString + "\r";
        qint64 bytesWritten = m_impl->serialPort->write(cmdString);

        if (bytesWritten == -1)
        {
            LOG("spamEcho").error() << QString("writeError error %1").arg(m_impl->serialPort->error());
        }
        else if (bytesWritten != cmdString.size())
        {
            LOG("spamEcho").error() << QString("writeError (write all) error %1").arg(m_impl->serialPort->error());
        }

        else if (!m_impl->serialPort->waitForBytesWritten(5000))
        {
            LOG("spamEcho").error() << QString("write timed out error %1").arg(m_impl->serialPort->error());
        }

        QByteArray readData;
        while (readData.size() < echoString.size()+5 && m_impl->serialPort->waitForReadyRead(300))
        {
            QByteArray newData = m_impl->serialPort->readAll();
            LOG("spamEcho").error() << "current read : " << QString(newData);
            readData.append(newData);
        }
        if (m_impl->serialPort->error())
        {
            LOG("spamEcho").error() << QString("Read Error : %1").arg(m_impl->serialPort->error());
        }

        if (readData[readData.size() - 1] != '\r'
            || readData.left(readData.size() - 5) != echoString)
        {
            LOG("spamEcho").error() << "Received " << QString(readData) << " instead of "
                << QString(echoString);
        }
        else {
            LOG("spamEcho").info() << "OK : received: " << QString(readData);
        }
    }