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I got a Sonoff RF gateway and flashed it with Tasmota. Now all the normal 433Mhz devices work 'as is'. My doorbell is unchanged, a 3 year battery life and costs 10 bucks.

The doorbell sound does ring on a custom device. An esp32 with an I2S class D amplifier that can play an an arbitrary mp3 from a web server with an mqtt command:

https://github.com/mianos/doorbell2/tree/main/src

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I've got a similar setup with a SDR tuned to 433Mhz using rtl_433. Really useful as the range is massive and it picks up all kind of devices; temperature sensors, weather stations, tyre pressure sensors.

I had a little SDR connected to an LXD container at first but I found the positioning was not really optimal.

What is also fun, is being able to use those little RF remotes and program node-red flows to, say, run the aircon (controlled with Tasmota IR box) for 20 minutes when I go to bed and another to turn off the lights. Much better than having to open the phone.

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