valetudo: Map not shown ("no map data")

On my Gen1 which I received recently, I cannot get the maps working. Controlling the robot works pretty much as intended (although I don’t really understand the manual control mode), but no matter how often I let it clean, I never get any map. I’ve set up a small <1m² test parkour for the bot.

Due to the lack of logging, which is the only easy way to assess Valetudo’s behavior, I cannot tell what’s going wrong. I’ve tried the builds from the release page (0.8.2 and 0.9.0), a Dustbuilder image and even one with the original Valetudo (which didn’t work at all).

To me it seems like there is map data (last_map for instance is not an empty file), but Valetudo won’t receive it via the dustcloud fake service (at least I think Valetudo doesn’t read the files directly but receives something via the socket on 808x). That’s also the reason for the map files not being copied to userX. I’m not sure whether the map should’ve been copied to /mnt/data/valetudo/last_map, the code isn’t completely clear on that.

In any case, I’d like to get into debugging this problem, really, but for someone like me who rather NOT touches node.js, some logging would be nice to have. Perhaps you can tell me where to start hacking?

P.S.: I can unfortunately not tell more information about what firmware it has after the factory reset, as mirobo ... info yields the infamous “vacuum not connected to cloud” error message.