Tag Archives: kannel

Persistent paths for dynamic device file

This post is related to playSMS and Kannel, how to configure Kannel when you know that the device file names aren’t persistent.


When USB GSM modem plugged to a server Linux kernel assigned dynamic device file /dev/ttyUSB*, such as /dev/ttyUSB0 or /dev/ttyUSB1. For example, USB GSM modem with 2 ports will then be assigned to /dev/ttyUSB0 for port 1 and /dev/ttyUSB1 for port 2.

Problem starts when we unplug the GSM modem and re-plug back afterwards. Linux kernel will then assign different device file to it, was /dev/ttyUSB0 now /dev/ttyUSB2 and was /dev/ttyUSB1 now /dev/ttyUSB3.

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