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Do any of these standards give confidence on how much functionality will work when on an isolated network?

I'm never sure what will break if i don't give it internet access :/

Matter is supposed to be a local IP protocol. Explicitly does not specify a cloud protocol. But it is an IP protocol and many devices that interact with a network may expect internet access and not work without (eg hubs and voice assistants). YMMV on controlling matter without such devices.

Speaking for myself not my employer.

Zigbee and zwave products basically guarantee this, but I really hope the matter logo makes it clear what required a cloud.

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