TOHKBD in general works. It seems as if setting the Keyboard Layout in the normal Jolla Settings now affects the layout of the TOHKBD. I have set it to German, and now can write umlauts with the TOHKBD. on the other hand it seems as if it is using a "real" German layout now, so for example the "-" key on my QWERTZ TOHKBD doesn't write a "-", but a "ß" (as it would be on a standard PC Keyboard for the key at that position). So the printed layout on the TOHKBD doesn't match up exactly with the Layout that is used.

All this was tested on SFOS 1.1.9.28 using the latest 0.4.2 of the tohkbd software