The cloud has the data from the stick and this can be accessed by an API. The data there is updated every 5 mins.
The inverter has all the data, and with a working approach, can provide data on a more frequent basis.
Modes of access into the stick include scraping the status page (limit info), listening to the server A/B, and accessing the internal server via Modbus.
This is the latest WiFi dongle. I don’t have any experience with this. However, as a first step access into the stick settings page will be required.
It may well be that the S3-WiFi-ST does not have a settings page.