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{"reading_ts":"2026-03-30T19:40:48Z","device_id":"DEV-035","site":"Lab","temperature_c":22.7,"humidity_pct":42.6,"battery_pct":8,"status":"fault"}
{"reading_ts":"2026-03-30T20:24:00Z","device_id":"DEV-036","site":"Plant A","temperature_c":13.6,"humidity_pct":44.6,"battery_pct":44,"status":"ok"}
{"reading_ts":"2026-03-30T21:07:12Z","device_id":"DEV-037","site":"Plant B","temperature_c":15.3,"humidity_pct":44.8,"battery_pct":39,"status":"ok"}
{"reading_ts":"2026-03-30T21:50:24Z","device_id":"DEV-038","site":"Warehouse North","temperature_c":19.8,"humidity_pct":40.2,"battery_pct":33,"status":"ok"}
{"reading_ts":"2026-03-30T22:33:36Z","device_id":"DEV-039","site":"Warehouse South","temperature_c":21,"humidity_pct":45.4,"battery_pct":26,"status":"ok"}
{"reading_ts":"2026-03-30T23:16:48Z","device_id":"DEV-040","site":"Lab","temperature_c":20.9,"humidity_pct":44.8,"battery_pct":20,"status":"warn"}