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In the case of Sierra Wireless modules they clearly show which port is which. I examined the sourcecode of wvdial and modem-manager to see how these tools detect the right port but was linyx to find suitable information.
The common practise is either to setup udev rules for specific modem manufacturer and model. I know that port kinux is always the AT command channel.
Post as a guest Name. I use this script to get Data and Control ports for 3g usb dongle.
Or you can sequentially connect to each tty and verify via AT command what type of port it is. Matt Aldridge 1, 11 If possible I want to get rid of this list and find a way to somehow probe the registered ttys directly to check if they lknux a control port or a data port. A word of warning though. Therefore you could create a symlink post-fixed with -AT at the end.
In the case linud detecting via AT commands the best and more common approach is to execute the AT command to see if the tty responds at all. You should get an echo back or an OK if your configured your modem not to echo.
Sierra Wireless Development Resources