I have not looked at the PHP-code at all. It seems to be a module for some German smart home product/service: Home — IP-Symcon :: Automatisierungssoftware
Any updates? 
Did anyone have any luck with integrating these Bose speakers? The manufacturer has shut down the developer portal.
Bose Developer Portal Closure
Dear Community,
As we plan ahead for upcoming Bose product releases, we wanted to let you know that we’ve made the decision to no longer support the Developer Portal. While we love the passion and creativity of our developer community and all it has contributed, we’ve chosen to focus our resources on future products and programs.
We’d like to extend our sincere thanks to everyone who shared and participated in this community over the years.
The Bose Dev Portal team
x2
Makes me want to sell up and move to another brand with more support.