I need to provide a basic geolocation service for my clients. I built a location service based on the phone geolocation. It works great, not a problem. My problem is that some of my clients don't have an internet connection.
I know there is a company like Geotab that can provide these types of services.
If I want to build my own (very basic one), how can I make my DIY (Arduino based) GPS communicate with my web servers?