Excellent question, thanks
The great starting point is this Workroom project:
Components for this project can be purchased as pre-installed set:
If you have individual components you will find out more information about the Core Module here:
Once properly programmed (Base unit + Remote unit), you will receive Clown.Talk (JSON) messages (like temperature and humidity) on virtual serial port from the Base Unit connected to Raspberry Pi.
We do not have full support of all Alpha items in the firmware yet but we will introduce it probably between Christmas and New Year eve
Regarding multiple Core Modules - it is obviously soon planned feature with high priority. I cannot say now when it will happen because we already wanted to introduce some basic security features with 1-to-many communication model.
I think the best thing I can do over the Christmas time is to publish some firmware skeleton on GitHub and you will be able to observe development and possibly participate at least by testing it - does it sound right ?