First version with basic recording

include/bluetooth.h

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+#pragma once
+
+#include <stdint.h>
+
+void bluetoothConfigure();
+
+bool bluetoothIsConnected();
+
+// In main.cpp
+uint32_t secondsUntilNextTemperatureMeasurement();

include/config.h

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+#pragma once
+
+#include <stdint.h>
+#include <hal/gpio_types.h>
+
+constexpr uint32_t serialBaudRate = 115200;
+
+constexpr gpio_num_t wakeupButtonPin = GPIO_NUM_13;
+// The time (in seconds) for which the device should stay awake after the button is pressed
+// The device also stays awake as long as a bluetooth connection is active
+constexpr uint32_t wakeupDurationAfterButtonPress = 30;
+
+
+constexpr uint32_t temperatureMeasurementIntervalSeconds = 60;

include/storage.h

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+#pragma once
+#include <stddef.h>
+#include <stdint.h>
+
+#include "temperature.h"
+
+constexpr uint8_t temperatureSensorCount = 2;
+
+constexpr size_t storageSize = 80000;
+constexpr uint16_t storageIntervalInSeconds = 15;
+constexpr size_t maximumStorageDurationInHours = (storageSize / TEMPERATURE_SENSOR_MAX_COUNT) * storageIntervalInSeconds / 3600;
+
+// Max size: 7664
+constexpr size_t maxRtcStorageSize = 7664;
+constexpr size_t rtcStorageSize = 7632;
+
+constexpr size_t maxEepromSize = 13350;
+constexpr size_t eepromSize = 13350;
+
+// The minimum temperature to store, in millidegrees celcius
+// True minimum will be higher by 1°, since two values are reserved 
+constexpr long temperatureShiftForStorage = -40000;
+constexpr long maximumTemperature = temperatureShiftForStorage + 255 * 500;
+
+constexpr uint8_t temperatureMaximumValue = 255;
+
+void storageConfigure();
+
+/**
+ * @brief Save temperatures for both temperature sensors
+ * 
+ * Temperatures are in millidegrees celsius
+ * 
+ * @param temperatures The array of temperatures
+ * @param count The number of elements in the array
+ */
+void saveTemperatures(Temperature* temperatures);
+
+void saveTemperatureAtCurrentIndex(Temperature temp);
+
+uint16_t getTotalNumberOfStoredBytes();
+
+uint16_t getRecordedBytesAtOffset(uint8_t* buffer, uint16_t offset, uint16_t count);
+
+void discardAllRecordedBytes();

include/temperature.h

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+#pragma once
+
+#include <stdint.h>
+
+constexpr uint8_t TEMPERATURE_SENSOR_MAX_COUNT = 2;
+
+constexpr uint8_t temperatureSensorNotAvailable = 0;
+constexpr uint8_t temperatureSensorFailure = 1;
+constexpr uint8_t temperatureMinimumValue = 2;
+
+enum class TemperatureStatus {
+
+    sensorNotFound = temperatureSensorNotAvailable,
+
+    sensorError = temperatureSensorFailure,
+
+    temperatureIsValid = temperatureMinimumValue,
+};
+
+struct Temperature {
+
+    TemperatureStatus status;
+
+    /**
+     * @brief The temperature value, in millidegrees celsius
+     * This value is only valid if the status is `temperatureIsValid`
+     */
+    long value;
+};
+
+
+void temperatureConfigure();
+
+void temperaturePerformUpdate(Temperature* temperatures);