Hi,
I have migrated my OpenHAB installation to version 2.5 and I do have an adapted version of the plugin running. Learning new shutters should work as well. The jar file can be found at http://www.danielweisser.de/org.openhab.binding.somfycul-2.5.0.jar
The source is somehow based on https://github.com/weisserd/openhab2-addons/tree/binding-somfycul - somehow because of the current changes of OpenHAB to version 3 (Development of openHAB 3.0.0 and 2.5.x) I do not have all changes on my current branch on github.
The baud rate is now configurable and my settings look as follows:
somfycul:culdevice:cul [ port="/dev/ttyACM0", baudrate="9600" ]