Venetian blinds and roller shutter motors - can a wireless remote control be retrofitted?

Damn! Seeing it like this, I should have also wired everything in the connection boxes before the painter plastered them... At least I would have had plenty of space ;-(

Hindsight is 20/20. It's not really better if it's already plastered, because if it breaks, you have electronic waste inside.
Please take a photo of the switch wiring including the Shelly, I have 2 roller shutters where I can't put it in the end box.

But definitely cheaper than a smart switch from a Gira or BuschJäger series.

I have installed many of the Shellys behind the switch. Tight but it works... you just have to connect them neatly and the cables shouldn't be too long.

Do you have normal doses installed or extra deep ones?

I'll put it this way ... I didn't order extra deep ones ... so I assume they're normal. If necessary, wedge out a little at the back.

I ordered a Shelly for myself. Let's see how I manage it... If anything, they have to be behind the switches for me... And preferably without much effort...

I removed a switch today. All necessary cables are there. Unfortunately, as an amateur, I just don't have enough space there. I will ask my electrician if he is up for it...