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Ok so to my understanding, /dev/ttyS1 is a serial port on my device and it is connected to a GSM modem (that is what the company claims).
So I want to be able to "converse" with that modem and send in some AT instructions.
I was told I could use "chat" or "screen" but I have tried everything in chat and I can't get it to talk to me. "screen" does not exist on Angstrom and since I do not have an internet connection on the device, I don't know how to get it on there.
When I had a similar problem, I got everything working on a desktop Linux machine using WvDial. When everything was working, I looked at the options and commands WvDial was using and then wrote chat scripts to do the same thing. I trimmed lines from the chat scripts until I had the minimal script needed to get the modem working. Then I moved those scripts to the target and everything worked.
Your other option is to install Ubuntu on the single board computer (SBC). If you just install Linux without the GUI (GNOME), it might fit.