How to connect using UDP to my pic32 and get an answer from it - qt

Question

I want to connet with Qt on windows to my PIC32 UDP server. With a test program in C, I can connect and get the answer, but with Qt it is impossible. What am I doing wrong ?
As you can see I use an ACTIVE WAITING with the while, and my slot doesn't seems to be triggered. Maybe you can see my mistake here ? I hate active waiting....
Here is my code on Qt :
void MuTweezer::run()
{
QHostAddress sender;
quint16 senderPort;
QByteArray datagram;
qint64 pendingBytes;
int cpt = 0;
// Message to send
QByteArray message("Hello that's charly");
// m_imuRcvSocket.bind(10000); why is it for in a client side !?
// SEEMS to NOT BE TRIGGERED
connect(&m_imuRcvSocket, SIGNAL(readyRead()), this, SLOT(recu()));
while(m_isRunning && cpt++ < 10)
{
// send the initial message
qint64 bytesSent= m_imuRcvSocket.writeDatagram(message, QHostAddress("192.168.0.15"), 10000);
cout << "Bytes sent : " << bytesSent << endl;
// We wait the answer from the server
while(!m_imuRcvSocket.hasPendingDatagrams());
// If there is no datagram available, this function returns -1
if((pendingBytes = m_imuRcvSocket.pendingDatagramSize()) == -1)
continue;
datagram.resize(pendingBytes);
m_imuRcvSocket.readDatagram(datagram.data(), datagram.size(),
&sender, &senderPort);
cout << "================="
<< "\nMessage from <" << sender.toString().toStdString().substr(7) << "> on port " << senderPort
<< "\nString : " << datagram.data()
<< "\nSize: " << pendingBytes << " Bytes (characters)\n"
<< "=================" <<
endl;
}
}
Here is my code on the PIC32, as you can see, once I receive a message, I send the answer, it allows me to make a bidirectionnal communication :
if(!UDPIsOpened(mySocket)){
DBPRINTF("Socket CLOSED");
continue; // go back to loop beginning
}
DBPRINTF("Socket OPEN");
if(!(lengthToGet = UDPIsGetReady(mySocket)))
continue;
// get the string
// UDPGetArray : returns the number of bytes successfully read from the UDP buffer.
if((lengthWeGot = UDPGetArray(message, lengthToGet)))
UDPDiscard(); // Discards any remaining RX data from a UDP socket.
/* Modifie it and send it back */
if(UDPIsPutReady(mySocket)){
message[20]= 'Z';
message[21]= 'i';
message[22]= 'b';
message[23]= 'o';
UDPPutArray(message, lengthWeGot);
UDPFlush();
}
Any idea ?

Answer 1

Try to use waitForBytesWritten and waitForReadyRead:
// to receive datagrams, the socket needs to be bound to an address and port
m_imuRcvSocket.bind();
// send the initial message
QByteArray message("Hi it's Charly");
qint64 bytesSent= m_imuRcvSocket.writeDatagram(message,
QHostAddress("200.0.0.3"),
10000);
bool datagramWritten = m_imuRcvSocket.waitForBytesWritten();
// add code to check datagramWritten
datagram.resize(50); // random size for testing
bool datagramReady = m_imuRcvSocket.waitForReadyRead() && m_imuRcvSocket.hasPendingDatagrams();
// add code to check datagramReady
m_imuRcvSocket.readDatagram(datagram.data(),
datagram.size(),
&sender,
&senderPort);
cout << "================="
<< "\nMessage from <" << sender << "> on port " << senderPort
<< "\nString : " << datagram
<< "\nSize: " << pendingBytes << " Bytes (characters)\n"
<< "=================" <<
endl;
A better alternative would be to use signals and slots as described in the documentation of QUdpSocket

Answer 2

if you plan to use the microprocessor as a client with UDP you need the MAC address of the destination machine otherwise it will not work. This one took me 4 hours to figure out.