Ok… happened to see a few relevant threads this weekend. POE powered Zwave controllers. You should be able to just make a separate mesh for this structure.
I’ve (TubesZB) been selling in Ethernet/PoE connected zigbee coordinators for a while now, and every few so often I’d get a request for a Z-Wave version.
I’m sort of half way there now: Z-Wave PoE Kit
I’m now offering a kit that you can plug a Zooz ZAC93 or Razzberry Pro 7 into to use over PoE no pi required. Other pi gpio radios will likely work but the two above are tested and fit in the case I’ve designed.
I also have the pcb available which I ship with the required pins to be soldered on …
This week, we tweaked our Z-NET so that it would work with HA and we’re testing this now. Seems to work pretty well. Before we head too far down this road, we’re wondering if this is something that folks would be interested in?
In a nutshell, the Z-NET is functionally equivalent to a Z-Wave USB dongle except it works with a network connection instead. Originally, we developed this back in 2015 as a way to support outbuildings (barns, workshops and other structures) that were out of range of the…
I think you’d want the znet option running its own zwave JS instance on the unit itself, then add a 2nd zwave integration for the garage mesh in HA.