Hello folks,
Here is a brand new Somfy Protexial integration I developed so I can interact with my good old security system through Home Assistant.
I initially developed it to support the a Protexial system but I strongly suspect it may also work for other Somfy systems which doesn’t support Tahoma such as Protexiom and maybe some others.
As of today it lets you control the alarm system, as well as attached covers and lights.
You can find it here: GitHub - the8tre/somfy-protexial: Integration Home Assistant pour centrale SOMFY Protexial
Or even more straight forward: 
Enjoy !