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web: node index.js

var express = require('express')
var bodyParser = require('body-parser')
var request = require('request')
var app = express()

var mqtt = require('mqtt');

// Your Channel access token (long-lived) 
const CH_ACCESS_TOKEN = '';

// MQTT Host
var mqtt_host = 'mqtt://m15.cloudmqtt.com';

// MQTT Topic
var mqtt_topic = '/ESP32';

// MQTT Config
var options = {
    port: 15443,
    host: 'mqtt://m15.cloudmqtt.com',
    clientId: 'mqttjs_' + Math.random().toString(16).substr(2, 8),
    username: 'mqttuser',
    password: 'mqttpass',
    keepalive: 60,
    reconnectPeriod: 1000,
    protocolId: 'MQIsdp',
    protocolVersion: 3,
    clean: true,
    encoding: 'utf8'
};


app.use(bodyParser.json())

app.set('port', (process.env.PORT || 4000))
app.use(bodyParser.urlencoded({extended: true}))
app.use(bodyParser.json())

app.post('/webhook', (req, res) => {
  var text = req.body.events[0].message.text.toLowerCase()
  var sender = req.body.events[0].source.userId
  var replyToken = req.body.events[0].replyToken
  console.log(text, sender, replyToken)
  console.log(typeof sender, typeof text)
  // console.log(req.body.events[0])

  if (text === 'info' || text === 'รายงาน') {
    // Info
    inFo(sender, text)
  }
  else if (text === '1' || text === 'เปิด' || text === 'on') {
    // LED On
    ledOn(sender, text)
  }
  else if (text === '0' || text === 'ปิด' || text === 'off') {
    // LED Off
    ledOff(sender, text)
  }
  else {
    // Other
    sendText(sender, text);
  }

  res.sendStatus(200)
})

function sendText (sender, text) {
  let data = {
    to: sender,
    messages: [
      {
        type: 'text',
        text: 'กรุณาพิมพ์ : info | on | off | เปิด | ปิด เท่านั้น'
      }
    ]
  }
  request({
    headers: {
      'Content-Type': 'application/json',
      'Authorization': 'Bearer '+CH_ACCESS_TOKEN+''
    },
    url: 'https://api.line.me/v2/bot/message/push',
    method: 'POST',
    body: data,
    json: true
  }, function (err, res, body) {
    if (err) console.log('error')
    if (res) console.log('success')
    if (body) console.log(body)
  })
}

function inFo (sender, text) {
  let data = {
    to: sender,
    messages: [
      {
        type: 'text',
        text: 'uid: '+sender
      }
    ]
  }
  request({
    headers: {
      'Content-Type': 'application/json',
      'Authorization': 'Bearer '+CH_ACCESS_TOKEN+''
    },
    url: 'https://api.line.me/v2/bot/message/push',
    method: 'POST',
    body: data,
    json: true
  }, function (err, res, body) {
    if (err) console.log('error')
    if (res) console.log('success')
    if (body) console.log(body)
  })
}


function ledOn (sender, text) {
  var client = mqtt.connect(mqtt_host, options);
  client.on('connect', function() { // When connected
      console.log('MQTT connected');
      // subscribe to a topic
      client.subscribe(mqtt_topic, function() {
          // when a message arrives, do something with it
          client.on('message', function(topic, message, packet) {
              console.log("Received '" + message + "' on '" + topic + "'");
          });
      });
      

      // publish a message to a topic
      client.publish(mqtt_topic, 'on', function() {
          console.log("Message is published");
          client.end(); // Close the connection when published
      });
      
  });
    

  let data = {
    to: sender,
    messages: [
      {
        type: 'text',
        text: 'LED ON'
      }
    ]
  }
  request({
    headers: {
      'Content-Type': 'application/json',
      'Authorization': 'Bearer '+CH_ACCESS_TOKEN+''
    },
    url: 'https://api.line.me/v2/bot/message/push',
    method: 'POST',
    body: data,
    json: true
  }, function (err, res, body) {
    if (err) console.log('error')
    if (res) console.log('success')
    if (body) console.log(body)
  })
}

function ledOff (sender, text) {
  var client = mqtt.connect(mqtt_host, options);
  client.on('connect', function() { // When connected
      console.log('MQTT connected');
      // subscribe to a topic
      client.subscribe(mqtt_topic, function() {
          // when a message arrives, do something with it
          client.on('message', function(topic, message, packet) {
              console.log("Received '" + message + "' on '" + topic + "'");
          });
      });
      

      // publish a message to a topic
      client.publish(mqtt_topic, 'off', function() {
          console.log("Message is published");
          client.end(); // Close the connection when published
      });
      
  });

  let data = {
    to: sender,
    messages: [
      {
        type: 'text',
        text: 'LED OFF'
      }
    ]
  }
  request({
    headers: {
      'Content-Type': 'application/json',
      'Authorization': 'Bearer '+CH_ACCESS_TOKEN+''
    },
    url: 'https://api.line.me/v2/bot/message/push',
    method: 'POST',
    body: data,
    json: true
  }, function (err, res, body) {
    if (err) console.log('error')
    if (res) console.log('success')
    if (body) console.log(body)
  })
}

app.listen(app.get('port'), function () {
  console.log('run at port', app.get('port'))
})

cd my-project/
git init
heroku git:remote -a esp32-mqtt

git add .
git commit -am "make it better"
git push heroku master

npm init
npm install express --save
npm install request --save
npm install mqtt --save

git add .
git commit -am "add Procfile index.js"
git push heroku master

heroku logs --tail

#include <PubSubClient.h>
#include <WiFi.h>

// Update these with values suitable for your network.
const char* ssid = "tonofarm.io"; // AP Name
const char* password = "********"; // AP Password

// Config MQTT Server
#define mqtt_server "m15.cloudmqtt.com"
#define mqtt_port 15443
#define mqtt_user "mqttuser"
#define mqtt_password "mqttpass"

WiFiClient espClient;
PubSubClient client(espClient);

void setup() {
  // Set LED_BUILTIN 
  pinMode(LED_BUILTIN, OUTPUT);

  Serial.begin(115200);
  delay(10);

  Serial.println();

  Serial.print("Connecting to ");
  Serial.println(ssid);

  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());

  client.setServer(mqtt_server, mqtt_port);
  client.setCallback(callback);
}

void loop() {
  if (!client.connected()) {
    Serial.print("Attempting MQTT connection...");
    if (client.connect("ESP32Client", mqtt_user, mqtt_password)) {
      Serial.println("connected");
    } else {
      Serial.print("failed, rc=");
      Serial.print(client.state());
      Serial.println(" try again in 5 seconds");
      delay(5000);
      return;
    }
  } else {
    // MQTT Topic /ESP32
    client.subscribe("/ESP32");
  }
  client.loop();
}

void callback(char* topic, byte* payload, unsigned int length) {
  Serial.print("Message arrived [");
  Serial.print(topic);
  Serial.print("] ");
  String msg = "";
  int i = 0;
  while (i < length) msg += (char)payload[i++];
  Serial.println(msg);
  digitalWrite(LED_BUILTIN, (msg == "on" ? LOW : HIGH));
}

#include                    //this needs to be first, or it all crashes and burns...
#include 
#include 
#include 
#include 

//flag for saving data
bool shouldSaveConfig = false;

//callback notifying us of the need to save config
void saveConfigCallback () {
  Serial.println("Should save config");
  shouldSaveConfig = true;
}

// Config MQTT Server
#define mqtt_server "m15.cloudmqtt.com"
#define mqtt_port 15443
#define mqtt_user "mqttuser"
#define mqtt_password "mqttpass"

WiFiClient espClient;
PubSubClient client(espClient);

void setup() {
  // Set LED_BUILTIN 
  pinMode(LED_BUILTIN, OUTPUT);

  Serial.begin(115200);
  delay(10);

  Serial.println();

  WiFiManager wifiManager;
  wifiManager.autoConnect();

  client.setServer(mqtt_server, mqtt_port);
  client.setCallback(callback);
}

void loop() {
  if (!client.connected()) {
    Serial.print("Attempting MQTT connection...");
    if (client.connect("ESP32Client", mqtt_user, mqtt_password)) {
      Serial.println("connected");
    } else {
      Serial.print("failed, rc=");
      Serial.print(client.state());
      Serial.println(" try again in 5 seconds");
      delay(5000);
      return;
    }
  } else {
    // MQTT Topic /ESP32
    client.subscribe("/ESP32");
  }
  client.loop();
}

void callback(char* topic, byte* payload, unsigned int length) {
  Serial.print("Message arrived [");
  Serial.print(topic);
  Serial.print("] ");
  String msg = "";
  int i = 0;
  while (i < length) msg += (char)payload[i++];
  Serial.println(msg);
  digitalWrite(LED_BUILTIN, (msg == "on" ? LOW : HIGH));
}