I bought an “Ecowitt Shelly SBWS-90CM” and connected it to HA via BThome. Everything looks fine, but the rainfall measurements are not correct. I am attaching some pictures… Does anyone else have a similar problem? How can I fix this, please?
The measurements are for the same month from Shelly and HA.
Thank you.
FYI @ShellyIoT #shelly #BThome @bthome
I think the issue you are facing is the fact that the rain sensor itself is cummulative, so the data you see in HA are always going up (or at least thats how it is when its connected through Zigbee, but I presume it is the same through BT)
Shelly app “hides” this from you and gives you delta information for the specified day. To do this in HA you can create a new Utility meter helper (either in yaml or through UI - probably easiest) and have it reset daily, see more info here: Utility Meter - Home Assistant
I personally have one for hour, day, month and year each 
