Other issues of device networking

Why should I still need to re-enter the Wi-Fi password when I connect a new product?

My Smart device was not respond，it was uncontrollable?

Can the App supports add two devices which in two different networks?

Why I can only control the device when connected to my Wi-Fi, but not controlable through 4G or other Wi-Fi?

How to keep the device in the previous state after the power is restored?

Can multiple gateways be networked?

What are the requirements for a Bluetooth mesh device layout?

Since it is communicable for Bluetooth mesh device within a certain distance, can my neighbor control my Bluetooth mesh device？

When I manually power off and on the plug. The device will be removed from App.?

What should I do if the device is offline after a power outage or network disconnection, but cannot automatically reconnect to the network after network recovery or restore power?