ISensor.h

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// src/ISensor.h
#ifndef ISENSOR_H
#define ISENSOR_H
 
#include "Particle.h"

struct SensorData {
    time_t timestamp;

    char sensorType[16];

    bool hasNewData;

    uint16_t primary;

    uint16_t secondary;

    uint16_t aux1;

    uint16_t aux2;

    bool flag1;

    bool flag2;

    SensorData() : timestamp(0), hasNewData(false),
                   primary(0), secondary(0), aux1(0), aux2(0),
                   flag1(false), flag2(false) {
        sensorType[0] = '\0';
    }
    
    bool toJSON(char* buffer, size_t bufferSize) const;
};

class ISensor {
public:
    virtual ~ISensor() {}
    
    virtual bool setup() = 0;
    
    virtual bool loop() = 0;
    
    virtual SensorData getData() const = 0;
    
    virtual const char* getSensorType() const = 0;
    
    virtual bool isReady() const = 0;
    
    virtual void reset() = 0;

    virtual bool initializeHardware() { return setup(); }

    virtual void onSleep() {}

    virtual bool onWake() { return true; }

    virtual bool usesInterrupt() const { return false; }

    virtual bool isHealthy() const { return true; }

    virtual int lastErrorCode() const { return 0; }
};
 
// Implementation of SensorData::toJSON
inline bool SensorData::toJSON(char* buffer, size_t bufferSize) const {
    if (!buffer || bufferSize < 100) return false;
    
    JSONBufferWriter writer(buffer, bufferSize);
    writer.beginObject();
    
    writer.name("sensorType").value(sensorType);  // Already char*, no .c_str() needed
    writer.name("timestamp").value((int)timestamp);
    
    // Only include non-default values to save bandwidth
    if (primary > 0) {
        writer.name("primary").value(primary);
    }
    if (secondary > 0) {
        writer.name("secondary").value(secondary);
    }
    if (aux1 > 0) {
        writer.name("aux1").value(aux1);
    }
    if (aux2 > 0) {
        writer.name("aux2").value(aux2);
    }
    if (flag1) {
        writer.name("flag1").value(flag1);
    }
    if (flag2) {
        writer.name("flag2").value(flag2);
    }
 
    writer.endObject();
    
    return writer.dataSize() > 0;
}
 
#endif /* ISENSOR_H */