bsec_iot_example_mqtt

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/*!
 * @file bsec_iot_example.ino
 *
 * @brief
 * Example for using of BSEC library in a fixed configuration with the BME680 sensor.
 * This works by running an endless loop in the bsec_iot_loop() function.
 */

/*!
 * @addtogroup bsec_examples BSEC Examples
 * @brief BSEC usage examples
 * @{*/

/**********************************************************************************************************************/
/* header files */
/**********************************************************************************************************************/

#include "bsec_integration.h"
#include <Wire.h>


#include <ESP8266WiFi.h>
#include "Adafruit_MQTT.h"
#include "Adafruit_MQTT_Client.h"

/************************* WiFi Access Point *********************************/

#define WLAN_SSID       "xxx"
#define WLAN_PASS       "xxx"

/************************* Adafruit.io Setup *********************************/

#define AIO_SERVER      "xxx"
#define AIO_SERVERPORT  1883                   // use 8883 for SSL
#define AIO_USERNAME    "xxx"
#define AIO_KEY         "xxx"

/************ Global State (you don't need to change this!) ******************/

// Create an ESP8266 WiFiClient class to connect to the MQTT server.
WiFiClient client;
// or... use WiFiFlientSecure for SSL
//WiFiClientSecure client;

// Setup the MQTT client class by passing in the WiFi client and MQTT server and login details.
Adafruit_MQTT_Client mqtt(&client, AIO_SERVER, AIO_SERVERPORT, AIO_USERNAME, AIO_KEY);

/****************************** Feeds ***************************************/

// Setup a feed called 'potValue' for publishing.
// Notice MQTT paths for AIO follow the form: <username>/feeds/<feedname>
Adafruit_MQTT_Publish relhum = Adafruit_MQTT_Publish(&mqtt, AIO_USERNAME "/matbedroom/hum");

Adafruit_MQTT_Publish reltemp = Adafruit_MQTT_Publish(&mqtt, AIO_USERNAME "/matbedroom/temp");

Adafruit_MQTT_Publish relairQ = Adafruit_MQTT_Publish(&mqtt, AIO_USERNAME "/matbedroom/iaq");

/*************************** Sketch Code ************************************/

// Bug workaround for Arduino 1.6.6, it seems to need a function declaration
// for some reason (only affects ESP8266, likely an arduino-builder bug).
void MQTT_connect();

int8_t bus_write(uint8_t dev_addr, uint8_t reg_addr, uint8_t *reg_data_ptr, uint16_t data_len)
{
    Wire.beginTransmission(dev_addr);
    Wire.write(reg_addr);    /* Set register address to start writing to */
 
    /* Write the data */
    for (int index = 0; index < data_len; index++) {
        Wire.write(reg_data_ptr[index]);
    }
 
    return (int8_t)Wire.endTransmission();
}

/*!
 * @brief           Read operation in either Wire or SPI
 *
 * param[in]        dev_addr        Wire or SPI device address
 * param[in]        reg_addr        register address
 * param[out]       reg_data_ptr    pointer to the memory to be used to store the read data
 * param[in]        data_len        number of bytes to be read
 *
 * @return          result of the bus communication function
 */
int8_t bus_read(uint8_t dev_addr, uint8_t reg_addr, uint8_t *reg_data_ptr, uint16_t data_len)
{
    int8_t comResult = 0;
    Wire.beginTransmission(dev_addr);
    Wire.write(reg_addr);                    /* Set register address to start reading from */
    comResult = Wire.endTransmission();
 
    delayMicroseconds(150);                 /* Precautionary response delay */
    Wire.requestFrom(dev_addr, (uint8_t)data_len);    /* Request data */
 
    int index = 0;
    while (Wire.available())  /* The slave device may send less than requested (burst read) */
    {
        reg_data_ptr[index] = Wire.read();
        index++;
    }
 
    return comResult;
}

/*!
 * @brief           System specific implementation of sleep function
 *
 * @param[in]       t_ms    time in milliseconds
 *
 * @return          none
 */
void sleep(uint32_t t_ms)
{
    delay(t_ms);
}

/*!
 * @brief           Capture the system time in microseconds
 *
 * @return          system_current_time    current system timestamp in microseconds
 */
int64_t get_timestamp_us()
{
    return (int64_t) millis() * 1000;
}

/*!
 * @brief           Handling of the ready outputs
 *
 * @param[in]       timestamp       time in nanoseconds
 * @param[in]       iaq             IAQ signal
 * @param[in]       iaq_accuracy    accuracy of IAQ signal
 * @param[in]       temperature     temperature signal
 * @param[in]       humidity        humidity signal
 * @param[in]       pressure        pressure signal
 * @param[in]       raw_temperature raw temperature signal
 * @param[in]       raw_humidity    raw humidity signal
 * @param[in]       gas             raw gas sensor signal
 * @param[in]       bsec_status     value returned by the bsec_do_steps() call
 *
 * @return          none
 */
void output_ready(int64_t timestamp, float iaq, uint8_t iaq_accuracy, float temperature, float humidity,
     float pressure, float raw_temperature, float raw_humidity, float gas, bsec_library_return_t bsec_status)
{
    Serial.print("[");
    Serial.print(timestamp/1e6);
    Serial.print("] T: ");
    Serial.print(temperature);
    Serial.print("| rH: ");
    Serial.print(humidity);
    Serial.print("| IAQ: ");
    Serial.print(iaq);
    Serial.print(" (");
    Serial.print(iaq_accuracy);
    Serial.println(")");
    MQTT_connect();

    if (! reltemp.publish(temperature)) {
      Serial.println(F("Failed to send temp"));
    } else {
      Serial.println(F("OK!"));
    }

    if (! relhum.publish(humidity)) {
      Serial.println(F("Failed to send hum"));
    } else {
      Serial.println(F("OK!"));
    }

    if (! relairQ.publish(iaq)) {
      Serial.println(F("Failed to send iaq"));
    } else {
      Serial.println(F("OK!"));
    }
    
    delay(10000);
    
    
}

/*!
 * @brief           Load previous library state from non-volatile memory
 *
 * @param[in,out]   state_buffer    buffer to hold the loaded state string
 * @param[in]       n_buffer        size of the allocated state buffer
 *
 * @return          number of bytes copied to state_buffer
 */
uint32_t state_load(uint8_t *state_buffer, uint32_t n_buffer)
{
    // ...
    // Load a previous library state from non-volatile memory, if available.
    //
    // Return zero if loading was unsuccessful or no state was available, 
    // otherwise return length of loaded state string.
    // ...
    return 0;
}

/*!
 * @brief           Save library state to non-volatile memory
 *
 * @param[in]       state_buffer    buffer holding the state to be stored
 * @param[in]       length          length of the state string to be stored
 *
 * @return          none
 */
void state_save(const uint8_t *state_buffer, uint32_t length)
{
    // ...
    // Save the string some form of non-volatile memory, if possible.
    // ...
}

/*!
 * @brief           Load library config from non-volatile memory
 *
 * @param[in,out]   config_buffer    buffer to hold the loaded state string
 * @param[in]       n_buffer        size of the allocated state buffer
 *
 * @return          number of bytes copied to config_buffer
 */
uint32_t config_load(uint8_t *config_buffer, uint32_t n_buffer)
{
    // ...
    // Load a library config from non-volatile memory, if available.
    //
    // Return zero if loading was unsuccessful or no config was available, 
    // otherwise return length of loaded config string.
    // ...
    return 0;
}

/*!
 * @brief       Main function which configures BSEC library and then reads and processes the data from sensor based
 *              on timer ticks
 *
 * @return      result of the processing
 */
void setup()
{
    return_values_init ret;

    /* Init I2C and serial communication */
    Wire.begin(0,2);
    Serial.begin(115200);
    
    // Connect to WiFi access point.
    Serial.println(); Serial.println();
    Serial.print("Connecting to ");
    Serial.println(WLAN_SSID);

    WiFi.begin(WLAN_SSID, WLAN_PASS);
      while (WiFi.status() != WL_CONNECTED) {
      delay(500);
      Serial.print(".");
    }
    Serial.println();

    Serial.println("WiFi connected");
    Serial.println("IP address: "); Serial.println(WiFi.localIP());
  
    /* Call to the function which initializes the BSEC library 
     * Switch on low-power mode and provide no temperature offset */
    ret = bsec_iot_init(BSEC_SAMPLE_RATE_LP, 0.0f, bus_write, bus_read, sleep, state_load, config_load);
    if (ret.bme680_status)
    {
        /* Could not intialize BME680 */
        Serial.println("Error while initializing BME680");
        return;
    }
    else if (ret.bsec_status)
    {
        /* Could not intialize BSEC library */
        Serial.println("Error while initializing BSEC library");
        return;
    }
    
    /* Call to endless loop function which reads and processes data based on sensor settings */
    /* State is saved every 10.000 samples, which means every 10.000 * 3 secs = 500 minutes  */
    bsec_iot_loop(sleep, get_timestamp_us, output_ready, state_save, 10000);
}

void loop()
{  
}

void MQTT_connect() {
  int8_t ret;

  // Stop if already connected.
  if (mqtt.connected()) {
    return;
  }

  Serial.print("Connecting to MQTT... ");

  uint8_t retries = 3;
  while ((ret = mqtt.connect()) != 0) { // connect will return 0 for connected
       Serial.println(mqtt.connectErrorString(ret));
       Serial.println("Retrying MQTT connection in 5 seconds...");
       mqtt.disconnect();
       delay(5000);  // wait 5 seconds
       retries--;
       if (retries == 0) {
         // basically die and wait for WDT to reset me
         while (1);
       }
  }
  Serial.println("MQTT Connected!");
}

/*! @}*/