How embedded systems work: the hidden computers in everyday things, and how engineers build them
Over-the-air updates: how a device gets new firmware without breaking
A bug is found in a device already sold to ten thousand homes. Nobody will post it back, and nobody will plug in a cable. Yet one night, its firmware changes by Wi-Fi, and a power cut in the middle must not leave it dead. How?
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1
In spring, many countries move their clocks forward one hour. The next morning, Rono's inbox is full: the night lock stayed shut one hour too long, and cats waited at their doors.
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2
You find the bug in an hour: one line about the change of hour. The fix is easy, but ten thousand flaps already sit in ten thousand homes.
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