Awesome! Took some time, but I got it to work perferctly! Thanks

Please not that you'll need to install php 7.3 on Raspbian Buster

I've bought a cheap cable from ebay. For most smart meters you need to invert the RxD signal in the FTDI chip. Most of the China copies are read only, you cannot reprogram them. So in the end I bought a cable of €20 which is already programmed and has the right RJ11 connector on it. Works out of the ...

That's a good idea. I didn't even think of that.

I have exactly the same setup. And besides the delay, sometimes the wall switch is received by domoticz but the corresponding signal is not send to the fitting. When you then switch again, you first get another on signal before you can switch off again because of the wrong status caused by the first ...