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As a temporary workaround, consider connecting your IoT devices to a WiFi router that isn't connected to the Internet.

• Arizhel 9y ago
  No, put them on a VLAN that doesn't have internet access.
  • falcolas 9y ago
    That requires a lot more knowledge than most folks have. On the other hand, give them a separate router, and they can probably do that. But they probably won't do it in either case.