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Xmodem through Compuserve

We are attemping to transfer a file using Xmodem through Compuserve.  We can successfully connect to Compuserve and login in using a UNIX based C program.  When we initiate the xmodem transfer, Compuserve only responds back with C's after each time we try to send the first packet of data.  We are using the xmodem/CRC-16 protocol and the receiver is using the same.  Is there anything obvious that we should be looking at to remedy this problem.
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dokada
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dokada
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femson7Commented:
Yes, the type of xmodem you're using and it's packet size, eg 1024, 512, etc...

Errr, ur using compuserve not as an internet gateway but more like a BBS? To where do you intend to upload the file? compuserve or another individual?
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dokadaAuthor Commented:
femson7,

   We are using compuserve as more like a BBS to upload to another individual.  We can do orig or 16 Xmodem with checksum or CRC and can send with 128 or 1024 packet size.
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femson7Commented:
Ok, like a BBS. You first upload it to compuserve then if the file upload is successful, the other individual will download the file from compuserve. Is my understanding correct?

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dokadaAuthor Commented:
femson7,
   Our process is totally automated... we send a file via xmodem and expect to receive a file back.  we are using c functions to do this.
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femson7Commented:
What I what to know and confirm is to *WHICH* computer does your C functions UPLOAD the file to? To compuserve's computers for later retrieval by another implementation of  *AUTOMATED* c function in the remote computer.

Or are you using only using COMPUSERVE as a way to connect, but your C functions directly (well not quite since you're passing compuserve's lines) uploads and downloads to/from your site?

I am terribly sorry if you're having a hard time understanding me, as english isn't my primary tongue. But I do hope you now know a little better on what I am asking about...

Happy Holidays.
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femson7Commented:
In anycase, assuming you're implementation of xmodem is fully compliant, there are things to consider, like handshaking, port speeds, packet size, etc.

For a complete discussion of the transfer protocols, I suggest you go get a copy of DSZModem... a complete distribution copy. A textfile is inside that discusses everything...
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femson7Commented:
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dokadaAuthor Commented:
Our problem was hard for us to define.  The document above helped. thanks.
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femson7Commented:
Hey, thanks! And happy holidays.
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