NEW GUIDE – Network Interface Failover using FONA:
Use FONA as an internet connection failover device for highly available services
Do you hate it when the internet goes down in your area? Do you want to be notified when your internet goes down when you are away from home? Do you have a project that needs 100% internet availability where you would need to be notified of service disruption?
This guide will show you how use FONA as a secondary cellular connection to the internet with automatic failover and real time notifications.
I built a home security system to set off an alarm and notify me in the event of an intruder break in. The home security system requires an internet connection to route a message to my phone when the house is under attack. In the event of an internet outage someone could break into my house without my knowledge. To resolve this issue, I wrote a service to monitor my primary internet connection. When the service detects an internet outage it will automatically reroute all outbound traffic over a cellular network using the Adafruit FONA. A message will then be sent to my phone over the data plan to let me know my that my data plan is actively being used to route traffic. Once the primary internet connection is available, the data plan will no longer be used and all traffic will be automatically routed back to the primary interface.
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