[nostromo]

That exists today. Apple's Homekit is the only real solution for a smart home that doesn't send everything to/from the cloud.

[rubatuga]

I'm trying to update to v2 of HomeKit in the Home app but it won't let me unless I login to iCloud. From what I recall v2 of HomeKit relies on a hub spoke model, as opposed to v1 which relies more on broadcast packets.