Unable to send and receive images between 2 Raspberry connected to Zigbee via UART.

[J.Hilk]

@mrjj uh, I should read the opening post more clearly,

You're right, that is most likely the issue, ZigBee is a low data transfer protocol and from what my quick google search told me, limited to about 100 - 200 bytes, which fits exactly here

for a quick and dirty test, we could split the test byte array and send it delayed, that should work

void serial::on_pushButton_2_clicked()
{
        static QByteArray ba;
           int index(0);
           ba.fill('A', 1000);
           if(serialPort->isOpen()==true){
               QTimer *t = new QTimer();
               auto sendSection = [=,&index]()->void{
                   serialPort->write(ba.data() + index * 100, 100);
                   index ++;
                   if(index == 10)
                       t->deleteLater();
               };
               QObject::connect(t, &QTimer::timeout, sendSection);
               t->start(1000);
        //       quint64 send = serialPort->write(ba);
               qDebug()<< ba.size()<<"size_send:";
           }
}

[Rika]

@mrjj @J-Hilk Sorry for my late reply. The problem is when I try to send from PC with Realterm (Pc is also connected to Zigbee), on Pi4 I still get pictures.