Unsuccessfull read: MatLab-Arduino Bluetooth Communication via HC-05 device

I'm trying to understand why my code returns the message "Warning: Unsuccessful read: A timeout occurred before the Terminator was reached.'Bluetooth' unable to read all requested data." when i set a baud rate different from 9600 in the Arduino Sketch, for my bluetooth istance.

My code below

bt=Bluetooth('HC05',1);
fopen(bt);
stop_rec=0;
h=animatedline('Marker','o');
data=[];
i=1;
while(stop_rec==0)
    tic;
   a=fscanf(bt,'%s');
   ind=find(a==';');
   data(i,:)=[str2double(a(1:ind-1)),str2double(a(ind+1:end))];
   addpoints(h,i,data(i,1));
   drawnow
   i=i+1;
   flushinput(bt)
   flushoutput(bt)
   if(i>500)
       stop_rec=1;
   end
   toc;
end
fclose(bt);

Answer 1

[Urmila Rajpurohith]

Hi

The initialization process on the Arduino board takes a few seconds. "fopen" does not wait until the initialization process finishes.Adding a pause between "fopen" and the following commands may resolve the issue.The input of "pause()" depends on the hardware. Usually, a few seconds would be long enough.

Hope this helps!