So you have a Button Controller instance set up to control one device based on events from the others? The two things to check in that case:
Do button events come in from the "trigger" device as you expect (check "Events" on the device detail page for it to see); and
Do commands to the "target" device work as expected (you can manually run them from the device detail page to see).
Enabling logging for the app (Button Controller) will also give you an idea of what it is doing (or not) and when.
From your screenshots, the logs suggest the button event is getting generated, but looking at "Events" will tell you for sure. Be sure also to hit "Done" in Button Controller to save your changes if you haven't (and create the necessary event subscriptions).
Hello.
The problem has been solved. Thank you so much for your help.
It was not a software, configuration or hardware problem.
It was mainly a human problem (shame on me). Indeed, the duration of a click on the Wave i4 switch is very short and I was pressing the button too long (maybe 1/10s too long) according to my previous habits.