Instrument control toolbox UDP problems!

[jlcortex]

Hi, i need help please!

i am trying to connect flightgear to matlab throuhgt UDP
in order to test the PID closed loops of my autopilot.

I have noticed than i am not receiving data from flightgear
to matlab, in the other way it works ok.

I have simplied the problem to next experiment:

I have opened two instances of matlab,
I have created UDP object and opened port in both matlabs

>> u = udp('127.0.0.1', 5500)
>> fopen(u)

the same for both instances,

then i send a string in one of matlab instance:

>> fprintf(u, 'Aqui estamos');

and i try to get data in the other matlab instance:

>> fscanf(u)

and the result is :

Warning: A timeout occurred before the Terminator was reached.

ans =

''

Do someone knows what is incorrect in my experiment?

i am not a software expert and it seems very simple but i am expending a lot of time!
Thanks
Jose Luis