Why is there any upload and download data generated when the smart device is in standby?

Explain:
When a networked smart device is in standby, in order to ensure that the device can normally link with the network, a very small amount of data will be generated, which is a normal phenomenon.
In addition, for example, when the ambient appliance is in standby, the ambient temperature and humidity will be reported to the server, so the numerical change of the temperature and humidity can be seen only in the Xiaomi Home APP;
For example, camera monitoring products, set to save video or monitor alarm, etc., will upload video for users to view on the APP.
Other smart devices can also refer to the above explanation, so that users don’t have to worry about normal use.