Every Colibri module has an unique Serial Number.
There are different version of this stickers some of them have a 1-D bar code and some have a 2-D bar code.
In addition to the Serial Number, you can also find information about the type of the processor, speed and HW version on the sticker.
It is possible to read the serial number from user space.
For all modules, the serial is available in
cat /proc/cpuinfo | grep Serial# orcat /proc/cpuinfo | grep Serial | cut -d ':' -f2
For device-tree enabled modules, the serial number is available in
The SysinfoLib, which is part of our free Toradex CE Libraries contains functions to query the serial number.