Connected a retractive 2 way centre off switch and a LED dimmer, wired similarly to a Fibaro dimmer, this means i can control dimming and on/off either by the app, a scene or via the physical switch which I think is important.
If anything like Fibaro its very straightforward as wired in parallel, fingers crossed!!
We have created some guides for Fibaro wiring, so hope to do the same for Shelly
This is the one for the Fibaro dimmer
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Seb