How do I know the type of device (Power meter, thermometer, etc.)?

[ChrisRahme]

The productModel field in the device JSON is sometimes helpful to find the type of a device (e.g. NSPanel, Sonoff 4CH).

But sometimes, this field is empty (" ") for different types of products (e.g. temperature sensor and non-Sonoff breakers). Is there any way (besides examining the JSON structure) to know for sure the type of a device?

[baugp]

use method getDevice(id) then check the extra.uiid field.
https://coolkit-technologies.github.io/eWeLink-API/#/en/UIIDProtocol
https://github.com/skydiver/ewelink-api/blob/master/src/data/devices-type-uuid.json