Temperature
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Flashing a Xiaomi LYWSD03MMC, start to finish
The cheapest sensor worth owning needs fifteen minutes of setup before any hub can read it. It is done from a browser, it is hard to break, and here is every step.
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The temperature check you cannot make from a trailhead
A parked RV on a mild day can reach a hundred degrees inside an hour. This is the maths of that, and what monitoring does and does not solve.
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Setting up a Govee H5075 for RV monitoring
The cheapest way into RV monitoring is a sensor you can buy anywhere. Here is what the H5075 broadcasts, what we read from it, and the one setting that stops it working.