Magic text:Wifi/cell signal strength

The Wifi/Cell tower signal strength (written as [wifi_strength] and [cell_signal_strength]) can be used for example to determine the strength of the signal between your device and the router/tower (this can vary depending on the thickness of walls, the distance to the router/tower and several other various factors).
The scale of these values can be confusing : they range from -127 to 0 which might not be obvious on how to use.
The better the strength, the 
closer you will be to 0 the weaker the strength the closer you will be to -127: if you are standing next to the source, you'd typically be around -35. If you have a weak connection to a cell tower, you'd get around -110 to -115.
-127 means you are not connected to the source you are trying to measure. 2147483647 means the magic text broke for some reason..

Example Usage

Triggers
Regular interval (Interval: 00:00:30)

Actions IF (compare values([wifi_strength] < -80)) Connect to network (wifi1) Wifi connected (wifi2) Connect to network (wifi2) Wifi connected (wifi1) End if

Constraints
Geofence (Inside area : home)

Local variables
No variables