MQTT server log temp and control led Publish/Subscribe

Install MQTT Server https://www.nickagas.com/mqtt-server-and-client-on-mac/

The JavaFX based MQTT Client.

http://www.mqttfx.org/

iPhone client https://apps.apple.com/app/id1404331673

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Ardino

/*********
  Rui Santos
  Complete project details at https://randomnerdtutorials.com  
*********/


#include <ESP8266WiFi.h>
#include <ESP8266HTTPClient.h>
#include <WiFiClient.h>
#include <PubSubClient.h>
#include <OneWire.h>
#include <DallasTemperature.h>

//#include <Wire.h>
//#include <Adafruit_BME280.h>
//#include <Adafruit_Sensor.h>

// Replace the next variables with your SSID/Password combination
// Data wire is plugged into port D2 on the ESP8266
#define ONE_WIRE_BUS D2

// Setup a oneWire instance to communicate with any OneWire devices
OneWire oneWire(ONE_WIRE_BUS);

// Pass our oneWire reference to Dallas Temperature.
DallasTemperature sensors(&oneWire);

float tempSensor1;

uint8_t sensor1[8] = { 0x28, 0xDC, 0x8E, 0x5D, 0x05, 0x00, 0x00, 0xBE  };

const char* ssid = "ssid";
const char* password = "pass";

// Add your MQTT Broker IP address, example:
//const char* mqtt_server = "192.168.1.144";
const char* mqtt_server = "192.168.2.10";

WiFiClient espClient;
PubSubClient mqttClient(espClient);
long lastMsg = 0;
char msg[50];
int value = 0;
// the following variables are unsigned longs because the time, measured in
// milliseconds, will quickly become a bigger number than can be stored in an int.
unsigned long lastTime = 0;
// Timer set to 10 minutes (600000)
//unsigned long timerDelay = 600000;
// Set timer to 5 seconds (5000)
unsigned long timerDelay = 5000;

//uncomment the following lines if you're using SPI
/*#include <SPI.h>
#define BME_SCK 18
#define BME_MISO 19
#define BME_MOSI 23
#define BME_CS 5*/

//Adafruit_BME280 bme; // I2C
//Adafruit_BME280 bme(BME_CS); // hardware SPI
//Adafruit_BME280 bme(BME_CS, BME_MOSI, BME_MISO, BME_SCK); // software SPI
float temperature = 0;
float humidity = 0;

// LED Pin
const int ledPin = LED_BUILTIN;

void setup() {
  Serial.begin(115200);
  // default settings
  // (you can also pass in a Wire library object like &Wire2)
  //status = bme.begin();  
//  if (!bme.begin(0x76)) {
//    Serial.println("Could not find a valid BME280 sensor, check wiring!");
//    while (1);
//  }
  setup_wifi();
  mqttClient.setServer(mqtt_server, 1884);
  mqttClient.setCallback(callback);

  pinMode(ledPin, OUTPUT);
}

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());
}

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

  // Feel free to add more if statements to control more GPIOs with MQTT

  // If a message is received on the topic esp32/output, you check if the message is either "on" or "off". 
  // Changes the output state according to the message
  if (String(topic) == "lamp/room") {
    Serial.print("Changing output to ");
    if(messageTemp == "on"){
      Serial.println("on");
      digitalWrite(ledPin, LOW);
    }
    else if(messageTemp == "off"){
      Serial.println("off");
      digitalWrite(ledPin, HIGH);
    }
  }
}

void reconnect() {
  // Loop until we're reconnected
  while (!mqttClient.connected()) {
    Serial.print("Attempting MQTT connection...");
    // Attempt to connect
    if (mqttClient.connect("ESP8266Client")) {
      Serial.println("connected");
      // Subscribe
      mqttClient.subscribe("lamp/room");
    } else {
      Serial.print("failed, rc=");
      Serial.print(mqttClient.state());
      Serial.println(" try again in 5 seconds");
      // Wait 5 seconds before retrying
      delay(5000);
    }
  }
}


void loop() {
  if (!mqttClient.connected()) {
    reconnect();
  }
  mqttClient.loop();

  //Send an HTTP POST request every 10 minutes
  if ((millis() - lastTime) > timerDelay) {
    //Check WiFi connection status
    if(WiFi.status()== WL_CONNECTED){
      HTTPClient http;
      sensors.requestTemperatures();
      tempSensor1 = sensors.getTempC(sensor1); 
//      Serial.println("tempSensor1 "+tempSensor1);
      static char outstr[15];
     
      mqttClient.publish("temp/room",  dtostrf(tempSensor1,7, 3, outstr));
      
    }
    else {
      Serial.println("WiFi Disconnected");
    }
    lastTime = millis();
  }
  
}