LiteOS open API interface does not have the following () functions?

If you are writing to a friend at this time, the phone ringing, you go to answer the phone, and then continue to write after you have answered the phone, the ringing of the phone during this process can be called which function

The main application modules of Huawei's power Internet of Things solution include ()? (multiple choice)

The main function of gateway access authentication is to authenticate the identity of the gateway and prevent unauthorized access by illegal devices.

In the field of smart home, smart ONT can also be based on USB Dongle extension, providing a variety of Basic Access CapA, Bilities for the Internet of Things, including Zig-bye/Z-wave. Through the unification of access standards, it will be possible to integrate smart devices from different manufacturers.