Your Linux Data Center Experts

Usually when I insert my Sprint cellular wireless card it shows up on /dev/ttyUSB3, but the other day it showed up on ttyUSB6. When you insert the card it creates 10 ttyUSB files, and I just want my card to work. So, I wrote a small python program (based off code I have previously written for talking to serial devices). Read on for how I solved it.

The correct device will respond to “AT” with “OK”, just like an ancient Hayes modem. So, I took some code I had that talks to serial devices fairly conservatively but without getting hung up waiting for a response that will never come, and just walk through the likely devices looking for one that responds to AT with OK.

I've made this code available at ftp://ftp.tummy.com/pub/tummy/sprintfind including an example of it's use in my connection script.

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