QLowEnergyService:: writeCharacteristic takes a long time, how can it be shortened?

[Jerome522]

The following is my code that takes about 100ms or more between qDebug1 and qDebug2. Even if I reduce the amount of data sent, the time spent is not significantly reduced. How should I handle this?

int CommBluebooth::SendDataEx(const QByteArray i_data)
{
int maxBytes = 200;
int frames = (i_data.count() - 1) / maxBytes + 1;
for (int i = 0; i < frames; i++)
{
if (i_data.isNull() || i_data.isEmpty() || !IsConnect())
{
return 0;
}

    int         sendlen = (i + 1 == frames) ? (i_data.count() -  (i * maxBytes)): maxBytes;
    QByteArray  sendData = i_data.mid(i * maxBytes, sendlen);
    if (m_service != nullptr)
    {
        QString str;
        str += QString("<%1> - ").arg(QTime::currentTime().toString("HH:mm:ss.zzz"));
        qDebug()<<"bluetooth strat sending："  << str;
        m_service->writeCharacteristic(m_writeCharacteristic, sendData, m_blueboothParam->writeMode);
        QString str2;
        str2 += QString("<%1> - ").arg(QTime::currentTime().toString("HH:mm:ss.zzz"));
        qDebug()<<"Bluetooth transmission completed："  << str2;
    }
}
return i_data.size();

}