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Z-Wave Long Range and its mile-long capabilities will arrive next year - Ars Technica
(arstechnica.com)
Home Assistant is open source home automation that puts local control and privacy first. Powered by a worldwide community of tinkerers and DIY enthusiasts. Perfect to run on a Raspberry Pi or a local server. Available for free at home-assistant.io
Depends on the device.
If it is AC powered, it acts as a repeater. If it is battery powered, it is only a node, not a repeater.
So, like ZigBee, thanks.