Since this morning (2021-09-15) the API always returns a null states object when querying the "/states/all" endpoint. The timestamp in the response seems to be OK, the response time is OK too.
There seems to be an issue with the server, it was 502 bad gateway for the entire site yesterday. Since the website is up again today, I hope mods are working on it and hopefully it gets fixed soon
If it can help pinpointing the issue, it was working this morning (20121-09-16) at approximately 9:30 CEST for a short period of time, but it's broken again.
I rezognize the short period (few minutes - same time Amsterdam-Central Time) that data came through via API. Since than no data received. API log states 'socket hang up' (lots of them in last month) and 16:56 Service 502 again.