Extension for Water Level Controller

#include <ESP8266WiFi.h>
#include <PubSubClient.h>
#include <Wire.h>
#include "Adafruit_HTU21DF.h"

const char* ssid = "WiFi SSID";
const char* password = "WiFi Password";
const char* mqtt_server = "IP MQTT Server";
const char* mqttUser = "username";            
const char* mqttPassword = "password";        
WiFiClient espClient;
PubSubClient client(espClient);
long lastMsg = 0;
char msg[50];

Adafruit_HTU21DF htu = Adafruit_HTU21DF();

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

void reconnect() {
  // Loop until we're reconnected
  while (!client.connected()) {
    Serial.print("Attempting MQTT connection...");
    // Attempt to connect
    if (client.connect("ESP8266Client", mqttUser, mqttPassword )) {  
      Serial.println("connected");
      client.subscribe("CayenneInput");
    } else {
      Serial.print("failed, rc=");
      Serial.print(client.state());
      Serial.println(" try again in 5 seconds");
      // Sleep for 5 minutes before retrying
      Serial.println("Failed to connect to MQTT server - sleeping for 5 minutes");
      delay(100);
      //ESP.deepSleep(10000, WAKE_RF_DEFAULT); //300000000
      delay(100);
    }
  }
}

void setup()
{
  Serial.begin(115200);

  int timeoutcounter = 0;
  WiFi.begin(ssid, password);
  Serial.println();
  Serial.println();
  Serial.print("Connecting to ");
  Serial.println(ssid); 
  while (WiFi.status() != WL_CONNECTED) {
    timeoutcounter++;
    delay(500);
    Serial.print(".");
    if (timeoutcounter >= 30){
      Serial.println("Failed to connect to wireless - sleeping for 5 minutes");
      delay(100);
      //ESP.deepSleep(10000, WAKE_RF_DEFAULT);
      delay(100);
    }
  }
  Serial.println("");
  Serial.println("WiFi connected");
  client.setServer(mqtt_server, 1883);
  client.setCallback(callback);
  
  delay(100);
  
  Wire.begin(4, 5); // SDA, SCL
  htu.begin();
  pinMode(14, INPUT); //High sensor
  pinMode(12, INPUT); //Low sensor
  pinMode(13, INPUT); //Relay status
}

void loop()
{
  if (!client.connected()) {
    reconnect();
  }
  client.loop();
 
  //Status message every 1s
  String mqtt_message = String("1"); 
  mqtt_message.toCharArray(msg, 50);
  client.publish("device/tank/status/", msg);

  //Temperature and humidity on board
  float insideTEM = htu.readTemperature();
  Serial.println(insideTEM);
  delay(100);
   mqtt_message = String(insideTEM); 
  mqtt_message.toCharArray(msg, 50);
  client.publish("tank/sensors/inside/temperature/", msg);
  delay(100);
  float insideHUM = htu.readHumidity();
  Serial.println(insideHUM);
  delay(100);
   mqtt_message = String(insideHUM); 
  mqtt_message.toCharArray(msg, 50);
  client.publish("tank/sensors/inside/humidity/", msg);
  delay(100);

  if(digitalRead(14)==HIGH)
  {
    mqtt_message = String("HIGH"); 
    mqtt_message.toCharArray(msg, 50);
    client.publish("tank/sensors/highsensor/", msg);
  }
  else
  {
    mqtt_message = String("LOW"); 
    mqtt_message.toCharArray(msg, 50);
    client.publish("tank/sensors/highsensor/", msg);
  }

  if(digitalRead(12)==HIGH)
  {
    mqtt_message = String("HIGH"); 
    mqtt_message.toCharArray(msg, 50);
    client.publish("tank/sensors/lowsensor/", msg);
  }
  else
  {
    mqtt_message = String("LOW"); 
    mqtt_message.toCharArray(msg, 50);
    client.publish("tank/sensors/lowsensor/", msg);
  }

  if(digitalRead(13)==HIGH)
  {
    mqtt_message = String("HIGH"); 
    mqtt_message.toCharArray(msg, 50);
    client.publish("tank/sensors/relaysensor/", msg);
  }
  else
  {
    mqtt_message = String("LOW"); 
    mqtt_message.toCharArray(msg, 50);
    client.publish("tank/sensors/relaysensor/", msg);
  }
 
  delay(1000);
}