I have all setup on my LAN, router is LinkSys WRT3200ACM, running latest Home Assistant on RP3 with SSL / DuckDNS service, accessing it from the Internet and so on, UPS making sure no power outages, … BUT… when the Internet from my ISP goes down then I get the panic attack!
So I was thinking for some 4G (LTE) failover device to plug maybe between the cable and router and to allow 4G connection only when no internet from my ISP. I am just not sure for the best way and device (brand) to go for and how to set it up. Because charges will apply when on 4G I need it really connects only when ISP Internet is down.
Is anyone familiar or has experience with such setup? And how about utilizing Google FI Sim cards for such device? 10$ per 1 GB of data.