Developing our own IOT router based on Linux. Will use wlan0 as primary with a 4G/LTE (wwan0) interface as secondary. We want 4G to takeover in the event of low wireless signal and/or loss of internet over wlan0.
I’m interested to see the different methods or suggestions the folks here may have on how to handle the failover mechanism. We can watch ping results to a destination (8.8.8.8/1.1.1.1) and failover when a number of pings fail. We also look at RSSI of currently associated AP and if it falls below a certain level for a few seconds, initiate failover. To initiate failover, we change route metric to favor 4G.
What other methods are folks using to do something similar?
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