How to get Radicale running

Does anyone here have Radicale running on OpenWrt?

After adding all the options in Luci that were offered with "Add", the server seems to be running. However, there are a few problems:

  1. The server is only accessible via an SSH tunnel. Is this probably because I have configured one for OpenWrt according to the documentation?
  2. Users encrypted with htpsswd cannot log in.

There is no documentation for OpenWrt available, so I'm a bit lost.