how to use udp in matlab

I tried to use udp in matlab with this code :

      u1 = udp('192.168.6.207', 8878, 'LocalPort', 8840);
      u2 = udp('192.168.6.207', 8840, 'LocalPort', 8878);

      fopen(u1);
      fopen(u2);

      a=[ char(240)];
      fprintf(u1,a);
      recStr = double(fscanf(u2));
      pause(.1);
      fclose(u1);
      delete(u1);
      clear u1;
      fclose(u2);
      delete(u2);
      clear u2;

but I get 63 instead of 240 . how can i fix this? any idea about my problem?

Thanks Hamid

[Geoff Hayes]

Hamid - if you remove the double around

 recStr = double(fscanf(u2));

and do instead

 recStr = fscanf(u2);

what is recStr?