mqtt_server/lib/mqtt/mqttClient.js

'use strict';
const mqtt = require('mqtt');
const request = require('request');
let util = require('util');
const logger = require('log4js').getLogger();

// var db = require('../server/db-connector').dbConnection;

// var nano = require('nano')('http://martind2000:1V3D4m526i@localhost:5984');
// var nano = require('nano')('http://localhost:5984');

// let db_name = 'mqtt';
// var dbCouch = nano.use(db_name);

let globalMode = 'FanOff';

let lastDispatch = 0;


const mqttClient = function (events) {

  const orgId = '';
  const userName = '';
  const appKey = 'bob';

  this.livingRoom = {
    temp: 0,
    last: 0
  };
  let mode = 'FanOff';

  const d = new Date();
  this.lastMsg = d.getTime();

  events.on('sendIFTTT', function (mode) {
    let d;
    const url = ['https://maker.ifttt.com/trigger/', mode, '/with/key/cWvECkeiyAPwmiOPBkXL2D'].join('');

    if (mode !== globalMode) {
      logger.info('Sending..');
      globalMode = mode;
      request(url, function (error, response, body) {
        logger.debug(response, body);
      });

      d = new Date();
      lastDispatch = d.getTime();
    } else {
      logger.warn('Not sent...');
    }
  });

  this.fanTimer = function () {

    let n;
    const now = new Date;
    const mod = 900000 - (now.getTime() % 900000);
    const day = now.getDay();
    const daytimeLimits = {low:27900000,high:63000000};
    const nowMS = (now.getHours() * 3600000) + (now.getMinutes() * 60000);

    if (globalMode === 'FanOff') {
      logger.info('Fans off, temp should be  <= 19.5');
      mode = (parseFloat(this.livingRoom.temp) <= 19.5) ? 'FanOn' : 'FanOff';
    } else {
      logger.info('Fans on, temp should not be less than 22.5');
      mode = (parseFloat(this.livingRoom.temp) <= 22.5) ? 'FanOn' : 'FanOff';
    }

    if ((globalMode !== 'FanOff' || mode !== 'FanOff') && ((day >=1 && day <=5) && (nowMS >= daytimeLimits.low && nowMS <= daytimeLimits.high))) {
      logger.info('Week day');
      mode = 'FanOff'
    }

    n = now.getTime() - this.lastMsg;
    logger.info('Last msg', n);

    if (n >= 600000) {
      logger.error('No message received for over 10 minutes');
      mode = 'FanOff';
      logger.warn('Setting quit for 15 seconds.');
      setTimeout(()=>{throw new error('Ejecting for restart');}, 15000);

    }

    logger.info('LR temp:', this.livingRoom.temp);

    events.emit('sendIFTTT', mode);
    const data = {id: 'temperature', data: {mode: globalMode, temp: this.livingRoom.temp}};
    events.emit('sendSocket', data);

    setTimeout(this.fanTimer.bind(this), mod + 10);
  };

  this.lighting = 'lights';

  this.connected = false;

  const options = {
    keepalive: 3600,
    clientId: 'a:' + orgId + ':' + Date.now(),
    username: userName,
    password: new Buffer(appKey)

  };

  this.client = mqtt.connect('mqtt://' + orgId + 'silvrtree.co.uk', options);

  this.client.on('connect', function () {
    this.connected = true;
    logger.info('Connected to Silvr Broker');
    this.fanTimer();
  }.bind(this));

  this.client.subscribe('livingroomTemp');

  this.client.on('message', function (topic, message) {

    const json = JSON.parse(message.toString());
    logger.debug(json);
    logger.debug(json.temp);

    this.livingRoom.temp = parseFloat(json.temp);
    logger.info('lr:', this.livingRoom.temp, this.livingRoom.temp >= 22.6);

    if (this.livingRoom.temp >= 22.7) {
      logger.warn('Max temp reached, turn off');
      events.emit('sendIFTTT', 'FanOff');
    }
    const d = new Date();
    this.lastMsg = d.getTime();

    const data = {id: 'temperature', data: {mode: globalMode, temp: this.livingRoom.temp}};
    events.emit('sendSocket', data);

  }.bind(this));

  this.isConnected = function () {
    return this.connected;
  };

};

module.exports.mqttClient = mqttClient;