Transmission integration not working

I’ve added Transmission through the Integration page, a bunch of sensors and switches show up. However they never change state, even when Transmission is downloading or has finished torrents, the number stays at 0.

I’m running Transmission on OSMC-based rpi3 if that makes any difference, the webui of Transmission is accessible.

Any ideas what might be the problem? There’s no errors in HA log output.