[ionif]

Okay! Some success, I got this example running and communicating with Kodi: https://github.com/MattCheely/elm-port-examples. It uses Node as well as Elm which is kinda strange but I'm working on understanding it now and hopefully I can get a pure Elm solution running soon.

That's expected, that's the whole point of ports

This might be helpful:
https://github.com/elm-community/js-inte...n-examples

This might also be worth a read https://guide.elm-lang.org/interop/ports.html 

Ah thanks, yeah I'm slowly understanding the ecosystem of elm; its a little strange to me. I read the documentation you linked and I'm going to get the examples you linked running on my laptop next. Adapting those should be next.