testing

#include <stdlib.h>
#include <Wire.h>

#include <ESP8266WiFi.h>
#include <PubSubClient.h>

#include "SparkFunCCS811.h"

#define GOT_HERE()  do {Serial.print('['); Serial.print(__LINE__); Serial.println(']'); Serial.flush();} while(0)
#define pSDA 2
#define pSCL 14
#define DATA_MAX_IDX 50
#define MLX60914_I2C_ADDR 0x5a
#define CSS811_I2C_ADDR 0x5b
#define ROW 5
#define COL 2

// Global objects for sensors, WiFi and MQTT
CCS811 myCCS811(CSS811_I2C_ADDR);
WiFiClient espClient;
PubSubClient client(espClient);

// Variables to save values from sensors
int dtVOC[DATA_MAX_IDX] = {0};
int dCO2[DATA_MAX_IDX] = {0};
int i = 0;

// Varaibles for MQTT messages
char mqtt_msg[ROW][COL] = {0};

// Access credentials for WiFi connection
const char* ssid = "xxxxxxxxxxx";
const char* password = "xxxxxxxxxxxxxx";
const char* mqtt_server = "192.168.1.157";


// Connection to WiFi network
void setup_wifi() {

  delay(10);
  // We start by connecting to a WiFi network
  Serial.println();
  Serial.print("Connecting to ");
  Serial.println(ssid);

  WiFi.mode(WIFI_STA);
  WiFi.begin(ssid, password);

  while (WiFi.status() != WL_CONNECTED) {
    delay(500);
    Serial.print(".");
  }

  Serial.println("");
  Serial.println("WiFi connected");
  Serial.println("IP address: ");
  Serial.println(WiFi.localIP());
}

// MQTT function
void callback(char* topic, byte* payload, unsigned int length) {
  Serial.print("Message arrived [");
  Serial.print(topic);
  Serial.print("] ");
  for (uint8_t i = 0; i < length; i++) {
    Serial.print((char)payload[i]);
  }
  Serial.println();

  // Switch on the LED if an 1 was received as first character
  if ((char)payload[0] == '1') {
    digitalWrite(LED_BUILTIN, LOW);   // Turn the LED on (Note that LOW is the voltage level
    // but actually the LED is on; this is because
    // it is active low on the ESP-01)
  } else {
    digitalWrite(LED_BUILTIN, HIGH);  // Turn the LED off by making the voltage HIGH
  }
}

// MQTT function
void reconnect() {
  // Loop until we're reconnected
  while (!client.connected()) {
    Serial.print("Attempting MQTT connection...");
    // Create a random client ID
    String clientId = "ESP8266Client-";
    clientId += String(random(0xffff), HEX);
    // Attempt to connect
    if (client.connect(clientId.c_str())) {
      Serial.println("connected");
      // Once connected, publish an announcement...
      client.publish("CCS811/test", "Hello from pubsubclient");
      // ... and resubscribe
      client.subscribe("CCS811/test");
    } else {
      Serial.print("failed, rc=");
      Serial.print(client.state());
      Serial.println(" try again in 5 seconds");
      // Wait 5 seconds before retrying
      delay(5000);
    }
  }
}

void setup(){
  randomSeed(micros());
  Serial.begin(115200);
  Wire.begin(pSDA, pSCL);
  setup_wifi();
  client.setServer(mqtt_server, 58999);
  client.setCallback(callback);

  pinMode(LED_BUILTIN, OUTPUT);     // Initialize the LED_BUILTIN pin as an output

  //This begins the CCS811 sensor and prints error status of .beginWithStatus()
  CCS811Core::CCS811_Status_e returnCode = myCCS811.beginWithStatus();
  Serial.print("CCS811 begin exited with: ");
  //Pass the error code to a function to print the results
  Serial.println(myCCS811.statusString(returnCode));

  //This sets the mode to 10 second reads, and prints returned error status.
  returnCode = myCCS811.setDriveMode(2);
  Serial.print("Mode request exited with: ");
  Serial.println(myCCS811.statusString(returnCode));
}

void loop(){

  client.setKeepAlive(90);
  if (!client.connected()) {
    reconnect();
  }
  client.loop();

  if( myCCS811.dataAvailable() ){
    myCCS811.readAlgorithmResults(); //Calling this function updates the global tVOC and CO2 variables
    dCO2[i] = myCCS811.getCO2();
    dtVOC[i] = myCCS811.getTVOC();
    Serial.print("Iteration: ");
    Serial.println(i);
    Serial.print("CO2[");
    Serial.print(dCO2[i]);
    Serial.print("] -- tVOC[");
    Serial.print(dtVOC[i]);
    Serial.println("]");

    if( !(i % 5) && i){
      // Construct the message to send over , here
      for(int j = 0; j < ROW; j++){
        for(int k = 0; k < COL; k++){
          Serial.print("j: ");
          Serial.print(j);
          Serial.print(" - dCO2: ");
          Serial.print(dCO2[j]);
          Serial.print(" - dtVOC: ");
          Serial.println(dtVOC[j]);
          mqtt_msg[j][0] = 5; //dCO2[j];
          mqtt_msg[j][1] = 10; //dtVOC[j];
          Serial.print("CO2 [");
          Serial.print(mqtt_msg[j][0]);
          Serial.print("] -- tVOC [");
          Serial.print(mqtt_msg[j][1]);
          Serial.println("]");
        }
      }
      // Reset the variables and start over
      memset(dCO2, 0, sizeof(dCO2));
      memset(dtVOC, 0, sizeof(dtVOC));
      i = 0;
    }
    i++;
  }
  delay(2000);
}