Hy, I solved my problem an do a mysensors bridge for somfy rts.

I post the lib and the sample on the jeedom forum : https://www.jeedom.com/forum/viewtopic.php?f=35&t=21456 its in french but I can translate if needed
All the code and description inside the sample is in english

hello
the links to "The Transport messages " and "The MySensors Core messages" are brocken

thank you for your answere @mfalkvidd