Can someone let me know if I am in the right forum and if not point me in the right directions . The brother is thinking of using the below which is I believe is an open source for building automation (commercial)
To remotely connect and control you need a front end similar to below, NET-X which is compatible with KNX. Each one of these I believe comes blank and has to be customised and cost approx €8K each. He is looking to see if its possible/ more cost effective to buy his own box and get someone to write the necessary software.
There are other front end boxes out there that are cheaper but are more geared for the domestic market