Zwave extension over ethernet?

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Is there any way of encapsulating and transmitting zwave over ethernet?

I have powerline adapters that span out to my out buildings but its out of zwave range by the time I've gone through 2 walls and the open space.

Also, another zwave question... when pairing devices, will they pair via a repeater or only via the hub? (ie I need to take them to the hub to pair)

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No way of encapsulating, but assuming you have some place out there relatively weatherproof with power you could put another hub out there and bring back the device via HubMesh. As for you second question, most devices can be paired in place using Network Wide Inclusion mode (should be transparent to you unless using a secondary stick) - locks and devices that pair in whisper mode are the notable exceptions to this.

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EDITED: There really are not many Z-Wave over IP or such devices (see next post by @Tony for two options). Other workarounds generally focus on:

  1. Using a dedicated Z-Wave repeater on either side of the gap as they tend to have the best possible range. For their "simplicity" they are usually a bit more expensive than an outlet or plug, but not too expensive. I have not seen one rated for outdoor exposure so they usually have to go inside or in a box (which will decrease the signal).
  2. Using outdoor Z-Wave outlets that also have a repeating function. Generally tough enough to be directly outside and exposed, provide an outlet you can use, and are not too expensive, but with a bit less range than a dedicated repeater.
  3. Using a set of OTHER devices to mesh it together. This varies, but in Hubitat's case it could readily be another hub located in the building (if it has networking) and using hub mesh (as @thebearmay mentioned). I spotted some similar discussions for other types of devices where people put raspberry pis with Z-Wave dongles in different areas and "converted" everything to MQTT for passing it between them... but that would not be needed with the hub mesh.
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Z-Wave over IP gateways are available; Homseer sells a plug & play solution called Z-net that has been around for a while https://products.z-wavealliance.org/products/1252 and has been updated with a 700-series version Z-NET Z-Wave Network Controller Interface – HomeSeer . At $300/pair it is kind of pricey and is designed for their ecosystem.

Silicon Labs even provides a set of instructions on how to roll your own using a Raspberry Pi and Z-Wave dongle: Installing and Running the Z/IP Gateway - latest - Z-Wave Silicon Labs (silabs.com)

Integrating that into HEwould be yet another piece of work..

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