Lora Geofence Alert

Recently I came across "Geofence & Lora". Both are not a new technology.
But is new to me and I want to explore a little bit further.

So I combine Lora and Geofencing and build a Lora Geofencing Alert.

Basically, it consists of 2 unit. Home Lora unit and Remote Lora unit with GPS module.
The Remote Lora with send its current longitude and latitude to home Lora unit. At the same time
It will do the calculation to determine whether the Remote Lora unit is within the designated
polygon boundary. A LCD on the Remote Lora will display "Within boundary" or "Out of bound"

The Home Lora unit will send the Received longitude and Latitude from Remote Lora unit to server via home router, send Acknowledge to Remote Lora unit and calculate to determine whether the Remote Lora unit is within the designated polygon boundary as well. If out of bound, it will WhatsApp message "Out of bound" to designated phone.