A feature that I really would like to have implemented is a way to let the temp and/or humidity values in the App also trigger an alarm in the phone.
Lets say you want to monitor temperature remote then it would be great to have the phone tell you if the TH is reading a too high or low value or at least trigger an alarm in the phone when it switches the rely.
Currently I'm testing to monitor the temp in the radiator water in the house to see if I can use this to see if the pellets burner stops.
I programed the TH with ESPEasy and linked it to Domoticz instead, this way I can monitor temp and set any alarms I need and control the Sonoff with Http-commands with WiFi.
Lock here for ESPEasy software: https://www.letscontrolit.com/wiki/index.php/ESPEasy
And ex. here for flashing or just search "ESPEasy Sonoff" on Google : http://rutg3r.nl/sonoff/
Never seen the Sonoff software so I don't think it's out there so if you reprog the Sonoff you can't go back. Unless ITEAD releases the software but with the price on the Sonoff you can just chuck it in the bin and buy a new unflashed on.