Sensor Publisher rev_02

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    - Project: Sensor Publisher
    - Source Code NOT compiled for: Arduino Nano ESP32
    - Source Code created on: 2025-08-04 13:33:56

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/****** SYSTEM REQUIREMENTS *****/
/****** SYSTEM REQUIREMENT 1 *****/
    /* Publicar las variables de temperatura y humedad en */
    /* formato JSON mediante MQTT, usando la librería DHT */
    /* y el pin D2 del Arduino Nano ESP32. */
/****** END SYSTEM REQUIREMENTS *****/

/* START CODE */
/****** DEFINITION OF LIBRARIES *****/
#include <DHT.h>  // https://github.com/adafruit/DHT-sensor-library

/****** FUNCTION PROTOTYPES *****/
void setup(void);
void loop(void);
void publishSensorData(float temperature, float humidity);

/***** DEFINITION OF DIGITAL INPUT PINS *****/
const uint8_t TempHum_DHT22_DOUT_PIN_D2 = 2;

/****** DEFINITION OF LIBRARIES CLASS INSTANCES*****/
DHT dht(TempHum_DHT22_DOUT_PIN_D2, DHT22);

// Placeholder for MQTT client object
// Include your MQTT client library and instantiate the client here
// For example:
// #include <PubSubClient.h>
// WiFiClient espClient;
// PubSubClient mqttClient(espClient);

void setup(void)
{
    // put your setup code here, to run once:
    pinMode(TempHum_DHT22_DOUT_PIN_D2, INPUT_PULLUP);
    dht.begin();

    // Initialize MQTT connection here
    // For example:
    // mqttClient.setServer(mqtt_server, mqtt_port);
    // connectMQTT();
}

void loop(void)
{
    // put your main code here, to run repeatedly:
    // Read temperature and humidity
    float temperature = dht.readTemperature(); // Celsius
    float humidity = dht.readHumidity();

    // Check if any reads failed and handle errors
    if (isnan(temperature) || isnan(humidity)) {
        // Handle sensor read error
        return;
    }

    // Publish sensor data in JSON format
    publishSensorData(temperature, humidity);

    // Delay between readings, e.g., 2 seconds
    delay(2000);
}

void publishSensorData(float temperature, float humidity)
{
    // Format JSON string
    char jsonBuffer[128];
    snprintf(jsonBuffer, sizeof(jsonBuffer), "{\"temperature\":%.2f,\"humidity\":%.2f}", temperature, humidity);

    // Publish via MQTT
    // Replace 'mqttClient' with your MQTT client object
    // Example:
    // if (mqttClient.connected()) {
    //     mqttClient.publish("sensor/data", jsonBuffer);
    // }
    // For this example, we'll just print to Serial
    Serial.println(jsonBuffer);
}