Sidehistorik
...
At some point, ZenseHome added MQTT support for their system, so I created this:
Solution 1
| Gliffy Diagram | ||||||||
|---|---|---|---|---|---|---|---|---|
|
Pressing the Switch send a signal over 220V cable to the ZenseHome box, that post a message on a MQTT Tpoic, that Home Assistent picks up, and sends a toogle to the Hue Brige, that informs the Lamp over ZigBee..
Worked ok 
Solution 2
Later I introduced Node-RED:
...
This we started seeing som smaller periods, where the light would not work for some 1 minute... I was thinking that Node-RED or Home Assistant may be hanging due to Ressouces on the Laptop running it.
Solution 3
So I simplified - at this Time time ZenseHome has introduced Philips Hue support:
| Gliffy Diagram | ||||||
|---|---|---|---|---|---|---|
|
...
So I am back to the solution with Node-RED.
Conclusion
My only kind of conclosion is that the Hue interface in the ZenseBox is not working well, but that seems somewhat "farfetched" ...
Some of the "hanging" can for sure be pinpoint to the fact that the ZenseHome switches are + 10 years old - but there stille a significantly significantl improvement using ZenseHome MQTT going aound the Home Assistant (Nore-RED) path.
Another option that I not have tested, i using the Hue palette (Plug in) for Node-RED.