Connectivity is unpredictable; a trustworthy record isn't optional.
In cold chain logistics, shipments often pass through areas with no mobile coverage. If a device stops recording when the signal disappears, the timeline becomes guesswork — and that can lead to disputes later. One practical approach is to log events locally with a coordinated UTC timestamp. While offline, the device writes to a local buffer so the record doesn’t pause because the network is down. When coverage returns, it doesn’t need to stream everything. Instead, it sends a concise, digitally signed summary: the lowest, average and highest readings for the gap plus key events such as door openings. This keeps the timeline coherent without sending unnecessary data.
Battery life is part of the design constraint. The device sleeps most of the time and wakes only when something crosses a threshold, then transmits in short bursts rather than staying online continuously. Verification with controlled stress tests — including temperature and vibration, plus a 168-hour endurance run — ensures the behaviour holds up in real conditions.
If your shipment disappears into a dead zone for hours, what would make you trust the record when it comes back?
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