How to do network connection the proper way?

[Sasler]

I'm been struggling with network connection on the Symbian device (I'm currently testing it an a N8). I can get the network connection on the Qt Simulator just fine (also Maemo works), but not on the N8 nor different remote devices (like the N97).

I've been trying to find a wiki page or something that would give a sample how to do network connection properly on a Symbian device with Qt, but I haven't found any good ones. Can anyone please point me to a page?

What I need is this:

1. Find out if there is an existing connection
2. If not, check that the device is not in Offline mode
3. If not, establish connection
4. Check for connection errors

Cheers

[teknikko]

Which way you want to do your network connection.

By http or with tcp protocol.

Do you want to connect with your application on internet
(as http:///www... way) or on the local network as (connect to
local ip as : 192.168.1.1:4444) or how.

[Sasler]

Which way you want to do your network connection.

By http or with tcp protocol.

Do you want to connect with your application on internet
(as http:///www... way) or on the local network as (connect to
local ip as : 192.168.1.1:4444) or how.

I'm using normal http protocol to get data from the internet. But it's the connection manager thing I'm interested in. To see if the device is already connected to the internet or should a connection be opened.

[teknikko]

With my E71 device, i have found, that when i am connected with browser to internet
allready with my E71 device, the device is not asking any more about connection
procedures when i am connected to "internet" or to "local network" with my own made application.

But as you are using http protocol to connect to "internet", i am not able to help
you on your case.

"With socket you are able to connect any where from your phone as :192.168.1.55",
as far you just know the "numerical" ip address where to connect from you phone.

Sure, local differencies are between local carriers (=telephone or internet operators).

[Sasler]

OK, let me be a little bit more specific and show what I've been trying. Here is the code to check whether there is an existing network connection (this works in Qt Simulator and Maemo/N900, but not in N8 which always return false even when there is a connection present):

    QNetworkConfigurationManager mgr;
    QList<QNetworkConfiguration> activeConfigs = mgr.allConfigurations(QNetworkConfiguration::Active);
    if (activeConfigs.count() > 0) {
        return true;
    } else {
        return false;
    }

And here is how I try to open the connection:

            QNetworkConfigurationManager mgr;
            QNetworkConfiguration ap = mgr.defaultConfiguration();
            QNetworkSession* session = new QNetworkSession(ap);
            session->open();
            if (session->waitForOpened(1000)) {
//                do something
            } else {
                qDebug() << session->errorString();
            }

When I run this, I can see that the device (N8) is making an connection (in this case a WLAN connection), but I get the following error:

Unknown session error.

Again, this works in Maemo/N900.

So is this all wrong for Symbian? Should I do this differently and how?


Cheers

[rahulvala]

If it is running in N900 Maemo device and not in the Symbian N8.

Then one thing click in my mind is :

have you added NetworkServices in Symbian Capabilities ?

Like below :

symbian:TARGET.CAPABILITY = NetworkServices

Best regards,

[Sasler]

OK, I found CS001619 - Opening a network connection in Qt and I did the following modifications:

    if (m_session->waitForOpened()) {
        qDebug() << "Session Open";
    } else {
        qDebug() << m_session->errorString();
    }

This is what I get:

The specified configuration cannot be used.

Any thoughts?

Cheers

[Sasler]

If it is running in N900 Maemo device and not in the Symbian N8.

Then one thing click in my mind is :

have you added NetworkServices in Symbian Capabilities ?

Like below :

symbian:TARGET.CAPABILITY = NetworkServices

Best regards,

I have this:

symbian {
    TARGET.UID3 = 0xef50b89f
    TARGET.CAPABILITY = NetworkServices ReadUserData
    TARGET.EPOCSTACKSIZE = 0x14000
    TARGET.EPOCHEAPSIZE = 0x020000 0x800000
    ICON = icon.svg
}

[Sasler]

Now I tried this:

    QNetworkAccessManager *manager = new QNetworkAccessManager(this);
    connect(manager, SIGNAL(finished(QNetworkReply*)),
            this, SLOT(getData(QNetworkReply*)));

    manager->get(QNetworkRequest(QUrl("http://qt.nokia.com")));

And in getData I have:

    if (reply->error() == QNetworkReply::NoError) {
//      do something
    } else {  
        qDebug() << reply->errorString();
    }

The error I get is this:

Host qt.nokia.com not found

If the device is not connected, I see "Connecting MyWLAN" appearing twice and then the afore mentioned error. If it's already connected to the WLAN, it just gives the error immediately.

Any help would be greatly appreciated.

Cheers

[Sasler]

I just created a new project with exactly the same network things and it works!

In the very beginning of my original project I was missing the TARGET.CAPABILITY = NetworkServices in the symbian section of my pro file. I did add that early on, but it didn't help. However, after reading this I wanted to test it in a new project and that works.

But now my question is how can I fix this on my old project (which has quite a lot of code)? That is, if CAPABILITY = NetworkServices was missing in the initial testing, how can I get it work?

Cheers

[divanov]

make distclean
qmake
make
?

[Sasler]

make distclean
qmake
make
?

Thanks, that was it!