Some news for those who would be interested to have AJAX Alarm linked to Openhab.
Latest beta version of pysiaalarm ( 2.0.9b5 ) : GitHub - eavanvalkenburg/pysiaalarm at dev is working. ( the master one didn’t work with my setup, I don’t know why ).
So I will modify the simple python script ( run.py ) to send the raw message to my mqttbroker.