
Ok, it took me 2 hours to find that I had only forwarded UDP traffic in my router... but other that that

All of my devices are controlled on&off, can be dimmed and colors changed AND reading of sensors works like a charm.
A very minor thing is that Computer(aka Alexa)-Volume-Up/Down does not work, but Computer-Volume-On/Off does, to activate a script that triggers an IR blaster. But all in all a great success! Thank you!