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![DIY WiFi mailbox sensor with ~12 years of battery, featuring ESP-NOW for subsecond transmission rates and MQTT. More info in comments : r/homeassistant DIY WiFi mailbox sensor with ~12 years of battery, featuring ESP-NOW for subsecond transmission rates and MQTT. More info in comments : r/homeassistant](https://i.redd.it/dlha3athwk581.jpg)
DIY WiFi mailbox sensor with ~12 years of battery, featuring ESP-NOW for subsecond transmission rates and MQTT. More info in comments : r/homeassistant
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