Other issues of device networking

What is the specification of the Wi-Fi password when adding devices?

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?

The gateway is next to the device, but the device is still always offline?

Why should I manually enter the Wi-Fi name when adding a device?

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

How to deal with issues with distribution network after Apple system is upgraded to iOS 13?

How many devices can be paired to the Bluetooth mesh network at most?

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