Configure your smart switch module to work with Tasmota open source firmware.
Shelly EM not reporting data · Issue #14261 · arendst/Tasmota · GitHub
New Device Procedure
Controlling multiple devices with the Sonoff NSPanel and Tasmota - James Ridgway
Shelly EM Phase Calibration · arendst Tasmota · Discussion #16486 · GitHub
Support for Shelly 3EM · arendst Tasmota · Discussion #13515 · GitHub
RevK®'s ramblings: Solar install, part 2 (tasmota/shelly EM)
Shelly 1PM - Tasmota
Shelly EM-120A, Energy Meter, shelly em
Support for Shelly 2 and Shelly 1 ? · Issue #2789 · arendst/Tasmota · GitHub
Shelly Plus 1PM Power Monitoring Switch Module (SNSW-001P16EU) Configuration for Tasmota
Shelly 1 Switch Module Configuration for Tasmota
Shelly Dimmer 2 Dimmer Module Configuration for Tasmota
Shelly 1PM - Tasmota
Issue with Shelly 2.5 (on latest Tasmota firmware) with button switch & control light · arendst Tasmota · Discussion #14476 · GitHub