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It sounds like you need to run a DHCP server on your AP to hand out addresses in the 10.0.0.0/24 range. This should make sure it sends an empty Option 3 value so no default gateway is sent to the phone. This will let the phone know it can only reach devices in the 10.0.0.0/24 range via this network and it should keep it's current default route. E.g. to do ...


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It was intentionally omitted for security reason, you do not want anyone (hacker or intruder when integrated with other smart home like Alexa and others) to open the door.


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