As far as communications between the hub and the RPI, that’s what the initial link that @nayelyz posted was about. Here it is again:
You do have to sign up for a developer account (it will look like it’s only for companies, but individuals can do that also) and do some initializing stuff in the cloud in order to get your hub to accept the communications. But after that the process between the hub and your local server can run locally. But ask any questions in that other thread, the people there will be able to give you much more help than I can.
