Unsolved Unable to send and receive images between 2 Raspberry connected to Zigbee via UART.
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@J-Hilk
Do you know if write blocks ?
QByteArray ba; // local
ba.fill('A', 1000);
if(serialPort->isOpen()==true){
serialPort->write(ba); // blocks here ? as ba is by reference -
Send:
#include "ui_serial.h" #include <QDebug> #include <QBuffer> #include <QPixmap> #include <QFile> serial::serial(QWidget *parent) : QMainWindow(parent), ui(new Ui::serial) { ui->setupUi(this); serialPort = new QSerialPort(this); serialPort->setPortName("ttyAMA0"); serialPort->setBaudRate(QSerialPort::Baud115200); serialPort->setDataBits(QSerialPort::Data8); serialPort->setStopBits(QSerialPort::OneStop); serialPort->setFlowControl(QSerialPort::NoFlowControl); serialPort->open(QIODevice::ReadWrite); if (serialPort->isOpen() == true){ qDebug() <<"Port Opened...."; connect(serialPort, SIGNAL(readyRead()), this, SLOT(on_readdata())); } } void serial::on_pushButton_2_clicked() { QFile* imageFile = new QFile("/home/pi/Desktop/image.jpg"); imageFile->open(QIODevice::ReadOnly); QByteArray ba = imageFile->readAll(); imageFile->close(); delete imageFile; if(serialPort->isOpen()==true){ serialPort->write(ba); qDebug()<<ba.size()<<"size_send:"; } }
Rec:
#include "serial.h" #include "ui_serial.h" #include <QtSerialPort/QSerialPort> #include <QDebug> #include <QBuffer> #include <QPixmap> #include <QFile> #include <QMessageBox> serial::serial(QWidget *parent) : QMainWindow(parent), ui(new Ui::serial) { ui->setupUi(this); serialPort = new QSerialPort(this); serialPort->setPortName("ttyAMA0"); serialPort->setBaudRate(QSerialPort::Baud115200); serialPort->setDataBits(QSerialPort::Data8); serialPort->setStopBits(QSerialPort::OneStop); serialPort->setFlowControl(QSerialPort::NoFlowControl); serialPort->open(QIODevice::ReadWrite); if (serialPort->isOpen() == true){ qDebug() <<"Port Opened...."; connect(serialPort, SIGNAL(readyRead()), this, SLOT(on_readdata())); } } serial::~serial() { delete ui; serialPort->close(); } void serial::on_readdata() { ba.append( serialPort->readAll()); qDebug()<<ba.size()<<"sizeeeee:"; if (ba.size() == 31021) { QFile newDoc("/home/pi/Desktop/imagexx.jpg"); if(newDoc.open(QIODevice::WriteOnly)){ newDoc.write(ba); } newDoc.close(); } // ui->label->setText(ba); // QPixmap b; // if(b.loadFromData(ba,"JPG")){ // ui->label->setPixmap(b); // } }
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@mrjj IIRC, it's passed on to the OS during the write call and that copies the data. But I'm not entirely sure 😬
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@J-Hilk
Yeah i was wondering since its a board if that still happens as it would
make sense we get cut if not.@Rika
Can you try thisvoid serial::on_pushButton_2_clicked() { static QByteArray ba; ba.fill('A', 1000); if(serialPort->isOpen()==true){ serialPort->write(ba); qDebug()<<ba.size()<<"size_send:"; } }
and tell me if we still only get up to 190 bytes with the sizeeeee message.
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@mrjj I tried, still only get 190.
16 sizeeeee:
32 sizeeeee:
64 sizeeeee:
64 sizeeeee:
14 sizeeeee: -
@Rika
Good testing.
So even it says
qDebug()<<ba.size()<<"size_send:";
1000 size_send
you only get
5 lines of
16 sizeeeee:
32 sizeeeee:
64 sizeeeee:
64 sizeeeee:
14 sizeeeee:
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@mrjj Sometimes 4 lines, sometimes 7 lines, but the total is 190 bytes. With 500-A, received only 230
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@Rika
Ok
if we do
ba.fill('A', 10);
do you then get all ? -
@mrjj yes.
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@Rika
So it seems data get cut over some size.What Os is running on the boards ?
Also maybe Zigbee has some sort of max transfer size ?
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@mrjj I use raspbian. I tried using a PC connected to zigbee and sent photos to my Pi4 + Zigbee with Realterm, my Pi4 received the photos. I think the error is in the program sends the data.
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well, lets narrow it down,
write returns a quint64 with the actual number of bytes written to the serialport, what does that return ?void serial::on_pushButton_2_clicked() { static QByteArray ba; ba.fill('A', 1000); if(serialPort->isOpen()==true){ quint64 send = serialPort->write(ba); qDebug()<<send << " of" << ba.size()<<"size_send:"; } }
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@J-Hilk 1000 of 1000 size.
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@Rika well,
to make sure your 2nd application is not simply very late in its creation/startup process, try clicking the button a 2nd time, see if something changes :DAfter that, time for a serial port listing device, to check what is actually transferred
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@J-Hilk
When i goggle Zigbee , i do see max payload mentioned.
Do you think that could be the cause here ?
I never used Zigbee so not sure if its even an issue. -
@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:"; } }
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