Disconnect from ble device in app designer

Hi everyone,

I am trying to disconnect from a ble device in app desginer, but somehow "clear app.ble" or "clear ble" does not work. I am still connected after that. Does anybody know how to disconnect properly?

[Geoff Hayes]

@Niklas Maximilian Busse - can you disconnect from the ble device outside of App Designer (like from the command line)? Can you show us the code where you create the connection? Is the variable/member really named ble like the ble function?

[Niklas Maximilian Busse]

In the function ConnectButtonPushed I connect to the ble device and assign it to the app property app.Device:

% Button pushed function: ConnectButton
        function ConnectButtonPushed(app, event)
            printOut(app, "Try to connect...")
            app.ConnectButton.Enable = "off"
            try
                clear app.Device
            catch
            end
            index = app.DevicesListBox.Value
            address = app.DeviceList.addresses(index)
            name = app.DeviceList.names(index)
            try
                device = ble(address)
                app.Device = device
                msg = 'Connected to device ' + name + ' with address: ' + address
                showConnectedButtons(app)
                app.DeviceInfo.Value = [msg]
            catch exception
                msg = getReport(exception, 'basic', 'hyperlinks','off')
            end
            printOut(app, msg)
            app.ConnectButton.Enable = "on"
            
        end

Property:

    properties (Access = private)
        Device ble % Description

And here I want to clear the variable but I think it does not get the right variable:

                % Button pushed function: DisconnectButton
        function DisconnectButtonPushed(app, event)
            clear app.Device
            printOut(app, "Disconnected")
            app.DevicesListBox.Items = [""]
            app.SelectedTextArea.Value = [""]
            showNotConnectedButtons(app)

        end

I dont know how to address the right variable, its the same problem for the console.

[Geoff Hayes]

@Niklas Maximilian Busse - how does

properties (Access = private)
    Device ble % Description

? Are you defining two properties, one called Device and the other ble? I see the code

clear app.Device

but you indicate that it doesn't work. Is that because when you try to re-connect, you get an error saying "already connected" (or something similar)? Have you tried just setting

app.Device = [];

which I've seen in the forum but I'm not sure if that will work as expected.

I was able to connect to a device (from the command line) and the clear seemed to work (in that I could then re-connect to the same device). I didn't try from within an app though.

[Niklas Maximilian Busse]

Thanks for your replies, I think I found a solution which is similar to your proposal. in the declaration of the property, I dont define the data type

    properties (Access = private)
        Device

so I can set it to "" when I want to disconnect:

    function onDeviceDisconnect(app)
        app.Device = "";