If the device dont provide local connection, there is nothing home assistant can do about it. Some device will also send data to the cloud even it is locally controlled by HA.
Thanks to laziness of the device manufacturers, a lot of them either expose some data endpoints locally, or just use Zigbee which can be easily paired to be used local-only.
Those that require Wi-Fi access can be filtered on the router to disable internet access.
depends on the device.
If the device dont provide local connection, there is nothing home assistant can do about it. Some device will also send data to the cloud even it is locally controlled by HA.
Thanks to laziness of the device manufacturers, a lot of them either expose some data endpoints locally, or just use Zigbee which can be easily paired to be used local-only.
Those that require Wi-Fi access can be filtered on the router to disable internet access.