Where can I find smart home accessories (via RS-485 and beyond)?

Question

Electronics

I am engaged in the project of my future “smart apartment”. I chose Wiren Board 5 as a controller, most of the devices will communicate with it via the RS-485 bus. On the manufacturer's website, you can pick up sensors, relays - there are not so many problems with this, but still the choice is limited. Moreover, not only complex devices are missing, but also banal things - for example, switches for lighting.
Two-position switches for a smart home are not suitable, you need to take push buttons (or something more tricky). It is not possible to find them from every manufacturer and not in every store. Question - where?
Even worse, if you do dimming - there are dimmer controllers on sale, but they are designed to connect directly to the lamps, without any “smartness” controlling them in parallel. I have the perfect control in my head: a dial that can be pressed like a button (to toggle between on and off), yet can be rotated both clockwise and counterclockwise to control brightness. I have not yet seen anything even close to similar - I will be glad if someone helps me find it. It is unlikely that you will be able to do something decent looking with your own hands. Or is there no other way?
In general, it would be very interesting for me to find stores (ideally, of course, offline in St. Petersburg, but at least online stores too) that have smart home devices in their assortment - so far I find only closed box solutions, or exclusively wireless devices . Or at least manufacturers who have something similar (buttons, knobs, sensors, relays, valves with RS-485 support).
Even if you just tell how you did it, if you have such experience, it will be very useful.

Answer 1

RS-485
Smart home devices with ModBus RTU interface (sensors, relay modules, LED strip light dimmers, etc.)

from here

Answer 2

Two-position switches for a smart home are not suitable, you need to take push buttons (or something more tricky). It is not possible to find them from every manufacturer and not in every store. Question - where?

Come on? Legrand sells them anywhere.
Everything has already been thought of before us. such a control is called an incremental encoder with a button. If you wish, you can build such an element into the housing from the dimmer, I didn’t find ready-made solutions from a swoop, look for yourself.
You will search for a long time, and what you find - you will not like it for the price. And you understand that each such device must be powered from the network, otherwise it will not work? That is, your desired button with RS-485 will contain the actual button, microcontroller, interface converter and power supply? Isn't it easier to buy a couple of I / O blocks for a wiren board and connect ordinary buttons directly to them via low-voltage wiring?