Re: Insertion of character inside a TCP frame

Hi Stephane

you may want to have a look at *babel* and maybe *cl-pack* for encoding and
decoding.  I am sure there are others around and some of them may suffer
from some bit rot.

All the best

Marco

On Tue, Jul 16, 2024 at 9:49 AM Christophe Rhodes <[email protected]> wrote:

> "steph.tougard via Sbcl-help" <[email protected]> writes:
>
> > For those who don't know, SMPP is a binary protocol over TCP to send
> > SMS. Unlike SMPP or HTTP, each frame is sent or received between the
>
> SMPP is a binary protocol, but your Lisp code uses characters and
> strings.  This means that there will be an encoding step on the Lisp
> side, to convert from characters to binary.
>
> In most lisps nowadays, the default encoding scheme is probably utf-8,
> which encodes the ASCII repertoire (the first 128 characters of Unicode)
> as single bytes, but uses multiple bytes for all other characters.
>
> I would guess that the string that you are attempting to send contains a
> character with char-code greater than 127, and that your stream is set
> up to convert characters using utf-8.
>
> You are using usocket, which does not allow users to specify external
> formats directly.  You could try setting
> sb-ext:*default-external-format* to :latin-1 before starting your
> server, or you could send binary (rather than string) data to your
> socket, performing the character to binary conversion yourself rather
> than making it implicit.
>
> Christophe
>
>
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>


-- 
Marco Antoniotti, Professor                   tel. +39 - 02 64 48 79 01
DISCo, University of Milan-Bicocca U14 2043   http://dcb.disco.unimib.it
Viale Sarca 336
I-20126 Milan (MI) ITALY

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