I already found the docs in my dashboard a few days ago and I can confirm it works using the header data. Thanks for the great service! Really appreciated.
This is more a feature request: it would be great to be able to configure the device (e.g. through the dashboard) so that it uploads its data not only to 23.239.13.18 (the uradmonitor.com server) but also to an extra (local) server in your own LAN like a Raspberry Pi running its own mysql db. This is ‘cleaner’ than scraping the JSON from the device webpage.
Unfortunately that won’t work easily. For the moment the JSON is the solution intended for that purpose, please go that route. There are also several useful scripts here on the forum.