Shelly HT accepts the following extra parameters on it's /settings endpoint:
Parameters
Parameter Type Description
actions hash For setting actions, see /settings/actions
temperature_units string Either C or F
temperature_threshold number Temperature delta (in °C) which triggers an update, 0..15
humidity_threshold number Humidity delta (in %) which triggers an update, 0..100
external_power bool Set if external power supply is installed
temperature_offset number Temperature offset (in °C), -50..50
humidity_offset number Humidity offset (in %), -50..50