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OMG, I'm trying to find code or a project that does this exact thing... ESP-based sensor clients communicating via ESP-NOW with another ESP acting as gateway to a remote MQTT server. I found EnigmaIOT on GitHub and it looks very full featured, but for the life of me I can't get any of its node/sensor examples to compile. ;(
Many of my sensors are battery powered. They deep sleep and wake on an an interval, except switch type devices like my mailbox which wake from deep sleep when the switch triggers a reset. There's some example firmware in this project of you want to see my typical application code. I also use deep sleep on non-battery sensors where possible because of how heat from the ESP can affect temperature readings.