add rssi icon
Received Signal Strength Indicator
4 bars distance ~ 3 meters from access point
3 bars adjacent room (a wall in between)
look https://helpcenter.engeniustech.com/hc/en-us/articles/234761008-What-is-RSSI-and-its-acceptable-signal-strength-
and https://helpcenter.engeniustech.com/hc/en-us/articles/360015304031 as well