App Designer Interrupt while evaluating ... PrivateValueChangedFcn

Hello,

I've created an app to stream data over bluetooth and display the data on an App Designer GUI. I am by no means a matlab expert however, attached is my project which worked in the past and then x, y, and z changes have left me unsure why it doesn't work now. If I break a process by CTRL-C the program will actually resume and work semi-properly but that is not ideal. I'm only a few days from a final presentation and demo day, so any help is greatly appreciated. I also appreciate critiques to coding techniques so I may become a better matlab programmer.

Thank you!

Project exported from .mlapp to .m

Problems occur when I change tabs or toggle a switch after changing tabs.

Here are the error messages after I Ctrl-C because the program is not responding:

After changing tabs...

In PL3GUI/readData (line 279)
                data = fgetl(app.Bt);

In PL3GUI/TabGroupSelectionChanged (line 729)
            readData(app);

In appdesigner.internal.service.AppManagementService/tryCallback (line 330)
                    callback(app, event);

In
matlab.apps.AppBase>@(source,event)tryCallback(appdesigner.internal.service.AppManagementService.instance(),app,callback,requiresEventData,event) 
Error using matlab.ui.internal.WebTabGroupController/handlePropertyUpdate (line 97)
Interrupt while evaluating TabGroup SelectionChangedFcn.

After toggling a switch...

In
matlab.apps.AppBase>@(source,event)tryCallback(appdesigner.internal.service.AppManagementService.instance(),app,callback,requiresEventData,event) 
Error using matlab.ui.control.internal.controller.ComponentController/executeUserCallback (line 378)
Interrupt while evaluating ToggleSwitch PrivateValueChangedFcn.

[Kennet Thurman]

Solved it.

I created a workaround by checking active tab and switch state based on global variables instead of strcmpi(app.someSwitch.Value, 'On') => isequal(app.someSwitch, 1). I think the issue sprung from changing tab or switch state while it's inside of the loop which executes code when the state is high but changed low or vice versa. I changed a plethora of other things as well like nested functions into functions with return values and so on.

15 stressful hours later I'm good to go. Attached is the working code.