My two light switches got stuck in an infinite echo loop
https://docodethatmatters.com/the-infinite-echo-state-mirror-bug/
#HackerNews #infiniteecho #lightswitchbug #techstories #hardwarehacks #problem-solving

The Infinite Echo: a State-Mirror Bug That Applies the Effect but Not the Dedup Key - Do Code That Matters
A state-mirror rule that updates the relay but never the dedup key guarantees an infinite echo, the same failure shape as replication storms and webhook retry loops. I found it live in two MQTT-linked light switches.