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I don't see the original casio, just advcasio.
It looks like it's working, but data put into the webapp doesn't do anything on the watch. It doesn't throw an error at least, lol
Edit: oh, two S's. I'll try later, cheers
Edit2: I had a thought, and tried the advcasio config software through a regular browser instead of gadgetbridge and it worked. So, solved I guess lol. Although having normal weather access for other watch faces would be nice eventually.
Not the answer to you question but
I managed to have weather working on the "advanced casio clock" with the API key of openweathermap.org and syncing from its own web app.
The syncing method is not ideal, but it can be re-coded ;)