“If it times out the polling frequency does not matter. Perhaps Xiaomi also did something to prevent third party control for the vacuum cleaner. I’m seeing more and more proof of Xiaomi actively doing stuff like that.”
Not yet, stil have local acces up till now and with current firmware. Newest app+firmware change the API to run via cloud acces for the newest devices, but if you use old app it still fine. Problem was in your app and it just need reinstall to make it work again.
Edit: perhaps you can add styj02ym to the list,
DeviceID 308796824
Model viomi.vacuum.v7
