Bluetooth - fread issues after flushinput

Good mornig,

I use an accelerometer wich computes values every 0.01 second. In order to develop an application with app designer, I made a code that display the gravitationnal field around -0.98 G. The data is collected from an arduino and goes trough bluetooth to Matlab.

When I don't flush the input incoming from the arduino, my application is too slow then there is a delay between the moment I shake the accelerometer and its display in the application.

So I put a flushinput, the problem mentionned above has been cleared but another appeared.

As you can see there are several errors when I display the data:

This is my code:

properties (Access = public)
        myTimer = timer('StartDelay', 0, 'Period', 0.01, 'TasksToExecute', Inf, 'ExecutionMode', 'fixedRate');
        obj1;
        anim;
        i = 0; % Description
        etat= 0; % Description
    end
    
    
methods (Access = private)
    
function results = drawnow(app,src,event)
         if app.etat == 1
                    y= fread(app.obj1,1, 'float');
                    addpoints(app.anim,app.i,y)
                    app.i= app.i+1;
                    app.UIAxes.XLim = [app.i-20, app.i+20];
                    drawnow
                    app.Label.Text = string(y);
                    flushinput(app.obj1);
                    if app.i>200
                        stop(app.myTimer)
                    end
         end 

function ConnexionButtonPushed(app, event)
    % Find a Bluetooth connection object.
    app.obj1 = instrfind('Type', 'bluetooth', 'Name', 'Bluetooth-HC-06:1', 'Tag', '');
    % Create the Bluetooth connection object 
    app.obj1 = Bluetooth('HC-06', 1);
    fopen(app.obj1);
    app.Label.Text = "connecté";
    app.etat=1;
end

end

    % Callbacks that handle component events
    methods (Access = private)
        % Code that executes after component creation
        function startupFcn(app)
                app.myTimer.TimerFcn= {@app.drawnow};
                start(app.myTimer)
                app.anim = animatedline('Color','k','LineWidth',1,'Parent',app.UIAxes);        
        end
        end

My question is:

How to avoid the wrong data?