I’m working with KNX systems and encounter lack of decent touch panels, so in last installation we have installed Crestron TSW panels just because of SIP support and visual design. Still, it’s software are badly designed(e.g. subpage switching is done via controller unit), has unreasonable price and proprietary, so, not hackable.
SIP is used also by doorbells systems like Mobotix/BasIP so it’s common case in smart home installations.
I’m also working on my own open-source project to control KNX bus values from single board computers using TP/UART, so, I was looking for software to use with SBC/Linux and discovered yours. Didn’t install it yet but demo case I tried in Android app is impressive.
So, will keep an eye on your software.