I’ve been testing today. I thought i found something but unfortunately it doesn’t seem to be the case. I attached the debugger in VSCode like in RF2 kaku It was quite difficult to get the right breakpoints to see what was going on. When I set qos to 2 in MQTT I can send multiple messages and process each one by stepping through the debugger.
I modified my home assistant config to send qos and verified this by creating a subscriber in Node-red. (MQTT Explorer doesn’t show qos correctly) and verified the right qos value was sent.
However when selecting a scene in HA not all RF commands are received. 
I’m testing with the latest stable 0.9.8 release or should I use DEV branch?
KR
Bert