[Solved]Lost Wifi settings after reboot

Kuzma30

I use in my app code from here
https://code.qt.io/cgit/qt/qtdeviceutilities.git/tree/examples/deviceutilities/settingsuiapp/DeviceUtilities/SettingsUI/Network
to make "Settings page".
I can set WiFi parameters. Its works fine, but when I reboot (Qt6.x Raspberry CM4 with boot2qt distro) I lost my WiFi settings and need re-enter it again.

In what place parameters saved and restored?

I also try example code from
https://doc.qt.io/QtDeviceUtilities-6.2/qnetworksettingsmanager.html#details

I put

#include <QtNetworkSettings/QNetworkSettingsManager>

and add in main

    wifiManager = new QNetworkSettingsManager(this);
wifiManager->connectBySsid("mySSID","my_passwod");

but get error

/home/qtemb/FertiGUI/main.cpp:568: error: invalid use of ‘this’ in non-member function
/home/qtemb/FertiGUI/main.cpp:568:47: error: invalid use of ‘this’ in non-member function
  568 |     wifiManager = new QNetworkSettingsManager(this);
      |                                               ^~~~

Axel Spoerl

@Kuzma30 said in Lost Wifi settings after reboot:
Generally: Please format your code, using the respective functions in the menu.
It makes things so much easier to read for those who want to help.

and add in main
wifiManager = new QNetworkSettingsManager(this);

The parent argument thisdoesn't refer to anything, because main is not a class member.

I don't know if this is the reason for loosing / not restoring the WiFi settings.
It's documented here, how to obtain the name of the settings file.

Kuzma30

I add this code to my class for system parameters

class MySystem : public QObject
{
    Q_OBJECT
....
Q_PROPERTY 
......
public:
    void connectWiFi()
        {
            auto wifiManager = new QNetworkSettingsManager(this);
            QString ssid = "mySSID";
            QString password = "myPassword";
            wifiManager->connectBySsid(ssid,password);
        }

and get error during linking

:-1: error: CMakeFiles/Ferti.dir/main.cpp.o: in function MySystem::connectWiFi()': /home/qtemb/FertiGUI/cpp/MySystem/mysystem.h:-1: error: undefined reference to QNetworkSettingsManager::QNetworkSettingsManager(QObject*)'
:-1: error: /home/qtemb/FertiGUI/cpp/MySystem/mysystem.h:47:(.text._ZN8MySystem11connectWiFiEv[_ZN8MySystem11connectWiFiEv]+0x58): undefined reference to `QNetworkSettingsManager::connectBySsid(QString const&, QString const&)'

JoeCFD

@Kuzma30 said in Lost Wifi settings after reboot:

QNetworkSettingsManager

You can not find the class QNetworkSettingsManager From here
https://doc.qt.io/qt-6/classes.html
Was it dropped in Qt6? I guess you are running Qt6 example.
What are your Qt version and OS?

Kuzma30

@JoeCFD said in Lost Wifi settings after reboot:

QNetworkSettingsManager

Qt 6.7.0 (boot2qt distro), OS linux

Axel Spoerl

@Kuzma30
But there's no QNetworkSettingsManagerin 6.7....

Kuzma30

@Axel-Spoerl
Agree (I don't know from where I get this files in my bsp). Now I rolling back to 6.6.
How to connect to WiFI nbetwork with SSID and password in v6.6?

Axel Spoerl

@Kuzma30
It was removed.
The reason, in a nutshell, is that the OS typically takes care of that and an application shouldn't manage its own network settings.

Kuzma30

@Axel-Spoerl
But this code works in QML 6.6 (Set button for enter password for SSID)

                QtButton{
                    id: setButton
                    text: qsTr("SET")
                    height: GUIParam.dialogButtonSize
                    onClicked: {
                        if (showSsid) {
                            NetworkSettingsManager.connectBySsid(ssidField.text, passField.text)
                            showSsid = false
                        } else {
                            NetworkSettingsManager.userAgent.setPassphrase(passField.text)
                        }
                        passphrasePopup.visible = false;
                    }
                }

Axel Spoerl

@Kuzma30
Can you post a screenshot of what it does, when it runs?

Kuzma30

@Axel-Spoerl

I make photo of procedure connecting to WiFi in my app. User can't access to system parameters.

Kuzma30

I am trying auto connect to wifi when main window loaded from ssid andd pass

    Component.onCompleted: {
        console.log("Check WiFi param")
        var ssid = param.getParameterValue("WIFI_SSID")

        if (ssid !== "none") {
            console.log("Power On WiFi")
            for (var i = 0; NetworkSettingsManager.interface(NetworkSettingsType.Wifi, i) !== null; i++) {
                var wifiInterface = NetworkSettingsManager.interface(NetworkSettingsType.Wifi, 0);
                wifiInterface.powered = true;
                pauseWiFi.start()
                console.log("power on")
            }
            NetworkSettingsManager.interfacesChanged();
            wifiSwitchTimer.start();
        }
    }
    Timer {
        id: pauseWiFi
        interval: 1000
        running: false
    }
    Timer {
        id: wifiSwitchTimer
        interval: 5000
        running: false
        onTriggered: {
            var ssid = param.getParameterValue("WIFI_SSID")

            var pass = param.getParameterValue("WIFI_PASSWORD")

            console.log("Connecting to WiFi " + ssid)
            NetworkSettingsManager.connectBySsid(ssid, pass)
        }
    }

But I get error

Tried to scan while not powered

Kuzma30

Updated code. More progress.

    Component.onCompleted: {
        NetworkSettingsManager.interfacesChanged()
        pauseWiFi.start()
    }
    Timer {
        id: pauseWiFi
        interval: 3000
        running: false
        onTriggered: {
            NetworkSettingsManager.services.type = NetworkSettingsType.Wifi;
            console.log("Check WiFi param")
            var ssid = param.getParameterValue("WIFI_SSID")

            if (ssid !== "none") {
                console.log("Power On WiFi")
                //sc.setWiFiOn()

                for (var i = 0; NetworkSettingsManager.interface(NetworkSettingsType.Wifi, i) !== null; i++) {
                    console.log("i="+i)
                    var wifiInterface = NetworkSettingsManager.interface(NetworkSettingsType.Wifi, i);
                    wifiInterface.powered = true;

                    console.log("power on")
                }

            }
            wifiSwitchTimer.start();
        }
    }
    Timer {
        id: wifiSwitchTimer
        interval: 5000
        running: false
        onTriggered: {
            var ssid = param.getParameterValue("WIFI_SSID")

            var pass = param.getParameterValue("WIFI_PASSWORD")

            console.log("Connecting to WiFi  \""+ ssid + "\"")

            NetworkSettingsManager.userAgent.setPassphrase(pass)
            NetworkSettingsManager.connectBySsid(ssid, pass)
            NetworkSettingsManager.interfacesChanged()
        }
    }

Now program poweron WiFi, NetworkSettingsManager.interface(NetworkSettingsType.Wifi, i) != null.
But result of connectBySsid() with correct ssid and pass - powered on WiFi but without connection.
I try code with and without NetworkSettingsManager.interfacesChanged() in the end. Same results.

Kuzma30

Final code, that working for me

   Component.onCompleted: {
        NetworkSettingsManager.interfacesChanged()
        pauseWiFi.start()
    }
    Timer {
        id: pauseWiFi
        interval: 3000
        running: false
        onTriggered: {
            NetworkSettingsManager.services.type = NetworkSettingsType.Wifi;
            console.log("Check WiFi param")
            var ssid = param.getParameterValue("WIFI_SSID")

            if (ssid !== "none") {
                console.log("Power On WiFi")
                for (var i = 0; NetworkSettingsManager.interface(NetworkSettingsType.Wifi, i) !== null; i++) {
                    console.log("i="+i)
                    var wifiInterface = NetworkSettingsManager.interface(NetworkSettingsType.Wifi, i);
                    wifiInterface.powered = true;

                    console.log("power on")
                }

            }
            wifiSwitchTimer.start();
        }
    }
    property var connectingService: null
    Timer {
        id: wifiSwitchTimer
        interval: 5000
        running: false
        onTriggered: {
            var ssid = param.getParameterValue("WIFI_SSID")

            var pass = param.getParameterValue("WIFI_PASSWORD")

            console.log("Connecting to WiFi  \""+ ssid + "\"")

            for (var index = 0; index < 10; index++) {
                if (NetworkSettingsManager.services.itemFromRow(index).name===ssid){
                    console.log("Found SSID at index = "+ index)
                    root.connectingService = NetworkSettingsManager.services.itemFromRow(index)
                }
            }
            root.connectingService.connectService();
            NetworkSettingsManager.userAgent.setPassphrase(pass)
            vpntimer.start();
        }

    }
        Timer{
            id: vpntimer
            interval: 5000
            running: false
             onTriggered: {
                 console.log("Start VPN")
                 processWrapper.executeCommand("systemctl start openvpn-client@client")
             }
        }