How to build own IoT Platform

HOW TO BUILD OWN IOT PLATFORM?

AGENDA
➤ What is Internet of Things
➤ What we may do with it?
➤ Does it involve in our lives?

REST API
➤ KISS - Keep It Simple Stupid
➤ Make documentation
➤ Use e. g. Swagger
➤ Integration with other APIs

COLLECT DATA AND ANALYSE
➤ e. g. Elasticsearch and Kibana

MQTT
➤ MQTT is lightweight, secure, battery friendly and machine-to-
machine (M2M) / “Internet of Things” connectivity protocol
➤ Publish-subscribed based
➤ Designed for connections with remote locations where “small
code footprint” is required and/or network bandwidth is
limited
➤ The publish-subscribe messaging pattern requires a message
broker
➤ The broker is responsible for distributing messages to
interested clients based on the topic of a message

MQTT
➤ supports oﬄine messaging
➤ retains messages like key/value store

MQTT SUBSCRIBER
var mqtt = require('mqtt');
// load balancer
var client = mqtt.connect('mqtt://YOUR.BROKER.URL');
client.subscribe('business/link');
client.on('message', function(topic, message) {
console.log(message.toString());
});
console.log('Client started...');

MQTT PUBLISHER
var mqtt = require('mqtt');
// load balancer
var client = mqtt.connect('mqtt://YOUR.BROKER.URL');
client.subscribe('business/link');
console.log('Client publishing...');
client.publish('business/link', ‘Welcome at IoT meeting… Test Ping! ' + Date());
client.end();

MQTT BROKERS
➤ Mosquito
➤ Mosca
➤ CloudMQTT
➤ HiveMQ

MQTT.JS
➤ 20k packets/second parser
➤ stream based
➤ High-Level Client API
➤ Low-Level Server

MOSCA
➤ Standalone usage
➤ Embeddable in your app
➤ Authentication API
➤ Supports AMQP, Mongo, Redis, and MQTT as pub/sub
backends
➤ Needs a DB as LevelDB, Mongo or Redis
➤ Support Websockets
➤ Fast, 10k+ messages routed per second
➤ Scalable, 10k+ concurrent connections

MOSCA, MQTT.JS, BROWSER
➤ Works on top of WebSockets
➤ Node.js excels that ;)
➤ MQTT over Websocket is ‘standard’
➤ Uses test broker at test.mosca.io

ECLIPSE PONTE
➤ Supports multiple protocols HTTP, MQTT, CoAP
➤ Based on Mosca, Express and Node.js
➤ Will support data transformation too!

THANKS
➤ Metteo Collina for an awesome stuﬀ ;)

ANGULAR SERVICE
define([
'angular',
], function (angular) {
'use strict';
angular.module('BenfiIoTApp.Services.MQTTService', [
'BenfiIoTApp.Config'
])
.factory('MQTTService', ServiceFn);
ServiceFn.$inject = [];
function ServiceFn() {
var service = this;
var client = {};
service.connect = connect;
service.publish = publish;
service.onMessage = onMessage;
function connect(host, port, user, password) {
var options = {
username: user,
password: password
};
console.log("Try to connect to MQTT Broker " + host + " with user " + user);
client = mqtt.connect(host, {});
client.subscribe("presence");
client.subscribe("sensors/brightness");
client.subscribe("sensors/temperature");
client.subscribe("sensors/humidity");
client.on('error', function(err) {
console.log('error!', err);
client.stream.end();
});
client.on('message', function (topic, message) {
service.callback(topic, message);
});
}
function publish(topic, payload) {
client.publish(topic, payload, {retain: true});
console.log('publish-Event sent '+ payload + ' with topic: ' + topic + ' ' + client);
}
function onMessage(callback) {
service.callback = callback;
}
return service;
}
});

BROWSER SUBSCRIBER
define([
'angular'
'use strict';
angular.module('BenfiIoTApp.Controllers.RealtimeCtrl', [
'BenfiIoTApp.Config',
'BenfiIoTApp.Services.MQTTService'
])
.controller('RealtimeCtrl', ControllerFn);
ControllerFn.$inject = ['$scope', 'MQTTService'];
function ControllerFn($scope, MQTTService) {
var vm = this;
vm.brightness = 0;
vm.temperature = 0;
vm.humidity = 0;
MQTTService.connect(
‘ws://YOUR.BROKER.URL'
);
MQTTService.onMessage(function(topic, payload) {
switch (topic) {
case 'sensors/brightness':
vm.brightness = payload.toString();
break;
case 'sensors/temperature':
vm.temperature = payload.toString();
break;
case 'sensors/humidity':
vm.humidity = payload.toString();
break;
default:
break;
}
$scope.$apply();
});
}
});

BROWSER PUBLISHER
define([
'angular'
'use strict';
angular.module('BenfiIoTApp.Controllers.ColorCtrl', [
'BenfiIoTApp.Services.MQTTService'
])
.controller('ColorCtrl', ControllerFn);
ControllerFn.$inject = ['MQTTService'];
function ControllerFn(MQTTService) {
var vm = this;
vm.selectedColor = '#000000';
vm.send = send;
MQTTService.connect(
'ws://YOUR.BROKER:URL'
);
function send() {
MQTTService.publish('color', vm.selectedColor);
}
}
});

DEVICE SOFTWARE
➤ On your Arduino Yun install packages:
➤ opkg update
➤ opkg install mosquitto mosquitto-client libmosquitto

DEVICE PUB/SUB
#include <MQTTclient.h>
#define MQTT_HOST “YOUR.BROKER.URL”
void setup() {
Serial.begin(115200);
// remember the bridge!
Bridge.begin();
// begin the client library (initialize host)
mqtt.begin(MQTT_HOST, 1883);
mqtt.subscribe("color", colorEvent);
}
void loop() {
// check for incoming events
mqtt.monitor();
mqtt.publish("sensors/brightness", brightness);
mqtt.publish("sensors/temperature", temperature);
mqtt.publish("sensors/humidity", humidity);
delay(1000);
}
void colorEvent(const String& topic, const String& subtopic, const String& message) {
// hex to rgb
String hexstring = message;
// Get rid of '#' and convert it to integer
long number = strtol( &hexstring[1], NULL, 16);
// Split them up into r, g, b values
long r = number >> 16;
long g = number >> 8 & 0xFF;
long b = number & 0xFF;
for (int i = 0; i < NUMPIXELS; i++) {
pixels.setPixelColor(i, pixels.Color(r,g,b)); // Moderately bright green color.
pixels.show(); // This sends the updated pixel color to the hardware.
delay(delayval); // Delay for a period of time (in milliseconds).
}
}

WHY CLOUD? WHY AWS? WHAT MAY BE USEFUL?
➤ Load balancers
➤ Security groups
➤ Autoscaling
➤ Elastic Beanstalk
➤ EC2
➤ S3
➤ Elasticsearch Service
➤ ElasticCache
➤ Lambda
➤ Kinesis

LINKS
➤ MQTT.js
➤ Mosca
➤ Eclipse Ponte
➤ Easy Arduino Yun MQTT Client

QUESTIONS?
Patryk Omiotek
patryk@benfimedia.pl
https://865632885505.signin.aws.amazon.com/console/

How to build own IoT Platform

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