Configure your smart switch module to work with Tasmota open source firmware.
Shelly 1 - Tasmota
Tinkering with Tasmota sensors
ESP32 Based Devices
Push Button on Shelly Devices · Issue #4914 · arendst/Tasmota · GitHub
Shelly Plus 1
Shelly 1PM - Tasmota
Shelly Plus - new Shelly series with product with new features
Which image to flash a Shelly 1 Plus · arendst Tasmota · Discussion #19736 · GitHub
EU Devices