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From: Ugur Bozkurt on 26 Jul 2010 01:34
> FSCANF and FPRINTF are specialized functions for 7 bit ASCII communication.
> What you describe sounds like 8 bit binary communication which is handled by
> FREAD and FWRITE. Try the following:
>
> >> echoudp('on',30000);
> >> u=udp('localhost',30000);
> >> fopen(u);
> >> fwrite(u,char([161,160,65,0,0,0,64,65,66,67]));
> >> tmp = char(fread(u, u.BytesAvailable,'char'))'
>
> tmp =
>
> ??A @ABC
>
> >> whos
> Name Size Bytes Class Attributes
>
> tmp 1x10 20 char
> u 1x1 242 udp
>
> >> uint8(tmp)
>
> ans =
>
> 161 160 65 0 0 0 64 65 66 67
>
>

It seems OK and I hope it will work.
Thanks for your help.
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