docs: add M9N GPS module plan
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@@ -291,3 +291,7 @@ Each temperature sensor supports optional high-temperature alerting:
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- `high_alert`
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When enabled and the live sensor temperature exceeds the configured threshold, the Cargo ESP includes `high_alert: true` for that sensor in `/api/v1/status`. The ESP32-S3 dashboard colors the affected grouped temperature tile red if any sensor in that displayed group is in alert.
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## M9N GPS Module
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The dashboard enclosure will include an M9N GPS module connected to the ESP32-S3 dashboard over UART. It will provide GPS fix status, satellite count, position, speed, and UTC time. Future work will use GPS time/location for automatic timezone and DST handling.
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