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.
dokadaAsked:
Who is Participating?
I wear a lot of hats...

"The solutions and answers provided on Experts Exchange have been extremely helpful to me over the last few years. I wear a lot of hats - Developer, Database Administrator, Help Desk, etc., so I know a lot of things but not a lot about one thing. Experts Exchange gives me answers from people who do know a lot about one thing, in a easy to use platform." -Todd S.

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?
0
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.
0
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?

0
Powerful Yet Easy-to-Use Network Monitoring

Identify excessive bandwidth utilization or unexpected application traffic with SolarWinds Bandwidth Analyzer Pack.

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.
0
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.
0
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...
0
femson7Commented:
0

Experts Exchange Solution brought to you by

Your issues matter to us.

Facing a tech roadblock? Get the help and guidance you need from experienced professionals who care. Ask your question anytime, anywhere, with no hassle.

Start your 7-day free trial
dokadaAuthor Commented:
Our problem was hard for us to define.  The document above helped. thanks.
0
femson7Commented:
Hey, thanks! And happy holidays.
0
It's more than this solution.Get answers and train to solve all your tech problems - anytime, anywhere.Try it for free Edge Out The Competitionfor your dream job with proven skills and certifications.Get started today Stand Outas the employee with proven skills.Start learning today for free Move Your Career Forwardwith certification training in the latest technologies.Start your trial today
Networking Hardware-Other

From novice to tech pro — start learning today.