Sensors
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A sensor went quiet, and the card already knows why
Out of range, out of battery, or somebody picked it up: three causes, one symptom, three different Saturdays. Every clue that separates them is already on the sensor’s own card, in the last frames before it stopped.
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The coin cell problem
A sensor that has run out of battery does not tell you it has run out of battery. Why coin cells fail in the cold, why lithium matters, and why last-seen is a reading in its own right.
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What we can read from a sensor, and what we cannot
Some sensors shout their readings to anyone listening. Others hold them behind a connection, a pairing, or an encryption key. That difference decides whether a device works with us.