Serial Data Logging From Arduino Using App Builder

Hello,

I am trying to read a simple string "Hello World" from Arduino in MATLAB via serial port in application programmed using App Builder tool. For Arduino, I am using following piece of code:

%%%%%%%%%%%%%%%%%%%%%%%% ARDUINO CODE %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

void setup() {
  // initialize serial communication at 9600 bits per second:
  Serial.begin(9600);
}

// the loop routine runs over and over again forever:
void loop() 
{
  Serial.println("Hello World");
  delay(1000);        // delay in between reads for stability
}

My Application is somewhat like the one in the link app_gui.png. The MATLAB Code View for this application is as under:

classdef My_matlab_app < matlab.apps.AppBase

    % Properties that correspond to app components
    properties (Access = public)
        UIFigure                    matlab.ui.Figure
        ConnectButton               matlab.ui.control.Button
        DisconnectButton            matlab.ui.control.Button
        DataRXTextAreaLabel         matlab.ui.control.Label
        DataRXTextArea              matlab.ui.control.TextArea
        ArduinoSerialDataReadLabel  matlab.ui.control.Label
        Lamp                        matlab.ui.control.Lamp
        COMPortsDropDownLabel       matlab.ui.control.Label
        COMPortsDropDown            matlab.ui.control.DropDown
        FixandRefreshButton         matlab.ui.control.Button
    end

    

    methods (Access = private)

        % Code that executes after component creation
        function startupFcn(app)
            
           app.COMPortsDropDown.Items=seriallist;
           %comPort = seriallist;
%            formatSpec = "Port Available: %s";
%            str = sprintf(formatSpec,comPort);
%            app.DataRXTextArea.Value = str;
           app.Lamp.Color = 'r';                         
        end

        % Button pushed function: ConnectButton
        function ConnectButtonPushed(app, event)
           display('Connected');  
           %msgbox('Arduino Connected!');
%            uf = uitextarea;
%            tarea = uitextarea(uf);
%            tarea.Value = 'Connected!';
%            answer = 'Arduino is Connected';
%            app.DataRXTextArea.Value = answer;         
          delete(instrfindall); 

           comPort = seriallist;
           %a = arduino(comPort,'Uno');
           s = serial(comPort);
           formatSpec = "Port Available: %s";
           str = sprintf(formatSpec,comPort);
           app.DataRXTextArea.Value = str;
           app.DataRXTextArea.Value = newline;
           app.Lamp.Color = 'g'; 
           
           fopen(s);
           serial_str = fscanf(s,'%s',500);
           app.DataRXTextArea.Value = serial_str;
        end

        % Button pushed function: DisconnectButton
        function DisconnectButtonPushed(app, event)
            display('Disconnected');  
           %msgbox('Arduino Connected!');
           app.DataRXTextArea.Value = 'Disconnected!';
           app.Lamp.Color = 'r';
           fclose(serial(seriallist));
           clear serial(seriallist);
        end

        % Value changed function: DataRXTextArea
        function DataRXTextAreaValueChanged(app, event)
            changingvalue = event.Value;
            app.ArduinoSerialDataReadLabel.Text = char(string(changingvalue)+"%");
            
        end

        % Button pushed function: FixandRefreshButton
        function FixandRefreshButtonPushed(app, event)
            app.DataRXTextArea.Value = 'Fixed and Refreshed!';
           
            delete(instrfindall);
        end

        % Button down function: UIFigure
        function UIFigureButtonDown(app, event)
            
        end
    end

    % App initialization and construction
    methods (Access = private)

        % Create UIFigure and components
        function createComponents(app)

            % Create UIFigure
            app.UIFigure = uifigure;
            app.UIFigure.Position = [100 100 558 347];
            app.UIFigure.Name = 'UI Figure';
            app.UIFigure.ButtonDownFcn = createCallbackFcn(app, @UIFigureButtonDown, true);

            % Create ConnectButton
            app.ConnectButton = uibutton(app.UIFigure, 'push');
            app.ConnectButton.ButtonPushedFcn = createCallbackFcn(app, @ConnectButtonPushed, true);
            app.ConnectButton.Position = [27 233 100 23];
            app.ConnectButton.Text = 'Connect';

            % Create DisconnectButton
            app.DisconnectButton = uibutton(app.UIFigure, 'push');
            app.DisconnectButton.ButtonPushedFcn = createCallbackFcn(app, @DisconnectButtonPushed, true);
            app.DisconnectButton.Position = [147 232 100 23];
            app.DisconnectButton.Text = 'Disconnect';

            % Create DataRXTextAreaLabel
            app.DataRXTextAreaLabel = uilabel(app.UIFigure);
            app.DataRXTextAreaLabel.HorizontalAlignment = 'right';
            app.DataRXTextAreaLabel.Position = [14 167 59 22];
            app.DataRXTextAreaLabel.Text = 'Data (RX)';

            % Create DataRXTextArea
            app.DataRXTextArea = uitextarea(app.UIFigure);
            app.DataRXTextArea.ValueChangedFcn = createCallbackFcn(app, @DataRXTextAreaValueChanged, true);
            app.DataRXTextArea.Position = [88 13 458 178];

            % Create ArduinoSerialDataReadLabel
            app.ArduinoSerialDataReadLabel = uilabel(app.UIFigure);
            app.ArduinoSerialDataReadLabel.FontSize = 18;
            app.ArduinoSerialDataReadLabel.FontWeight = 'bold';
            app.ArduinoSerialDataReadLabel.Position = [168 284 224 23];
            app.ArduinoSerialDataReadLabel.Text = 'Arduino Serial Data Read';

            % Create Lamp
            app.Lamp = uilamp(app.UIFigure);
            app.Lamp.Position = [307 242 20 20];

            % Create COMPortsDropDownLabel
            app.COMPortsDropDownLabel = uilabel(app.UIFigure);
            app.COMPortsDropDownLabel.HorizontalAlignment = 'right';
            app.COMPortsDropDownLabel.Position = [344 241 65 22];
            app.COMPortsDropDownLabel.Text = 'COM Ports';

            % Create COMPortsDropDown
            app.COMPortsDropDown = uidropdown(app.UIFigure);
            app.COMPortsDropDown.Items = {};
            app.COMPortsDropDown.Position = [424 241 100 22];
            app.COMPortsDropDown.Value = {};

            % Create FixandRefreshButton
            app.FixandRefreshButton = uibutton(app.UIFigure, 'push');
            app.FixandRefreshButton.ButtonPushedFcn = createCallbackFcn(app, @FixandRefreshButtonPushed, true);
            app.FixandRefreshButton.Position = [88 200 100 23];
            app.FixandRefreshButton.Text = 'Fix and Refresh';
        end
    end

    methods (Access = public)

        % Construct app
        function app = My_matlab_app

            % Create and configure components
            createComponents(app)

            % Register the app with App Designer
            registerApp(app, app.UIFigure)

            % Execute the startup function
            runStartupFcn(app, @startupFcn)

            if nargout == 0
                clear app
            end
        end

        % Code that executes before app deletion
        function delete(app)

            % Delete UIFigure when app is deleted
            delete(app.UIFigure)
        end
    end
end

I wanna read 500 values outta serial port in the text field with "Hello World" appended to next line for 500 values (or any number I want). That is, upon pressing "Connect Button", there should be displayed "Port Available: COM <any port>" and then from new line onwards in text area, "Hello World" should be printed at each new line in text area. Therefore, I need a simple hyperterminal type application for serial read from Arduino. I am using Arduino Uno in my case. Any help would be appricated, please.