@Kaoth I’ve uploaded 2.5.2-SNAPSHOT version of binding with support for writes, please test (you need to go over download procedure again).
Most of things gets mapped to ints so you need to work a bit with sitemaps. It works for analogs and binary I/O. I have no possibility to test multistate objects.
Anyone else interested in OH3 testing - please stand up! 
Best,
Łukasz