Gotta 'wire em all!

@hrios10

The IoT

Connect all the things!

A network of every day objects that exchange data with connected devices.

How do I start?

Interface

Plan

Code

The Plan

If you think of the connective device as a tool, how would you use it?

If a guest is coming, get DJ Roomba to start the party.
If I'm working late, dim the lights as my bedtime approaches.
If my heart often beats irregularly, notify my doctor.
If a bridge is icy, send a notification to slow down.

The Interface

There are frameworks like Artoo, ThingSpeak, and IoT Assistant.

But you can do this all with Rails.

The Interface

Some considerations:

Security. Use it.
Do you need it to be accessible from everywhere?
An HTTP API is not enough, use Web-sockets or ActionCable.

The Interface

Websockets

The Code

What you'll need

WebsockerRails::EventMap.describe do
  subscribe :turn_on, 'api/v1/driveway_sensor#create'
  subscribe :check_temperature, 'api/v1/driveway_sensor#check_temperature'
  subscribe :change_temperature, 'api/v1/driveway_sensor#change_temperature'
  subscribe :turn_off, 'api/v1/driveway_sensor#destroy'
end

Websocket-Rails

The Code

What you'll need

class Api::V1::DrivewayController < WebsocketRails::BaseController
  def initialize_session
   controller_store[:sensors] = DrivewaySensorInterface.new
  end

  def create
   controller_store[:sensors].turn_on
  end

  def destroy
   controller_store[:sensors].turn_off
  end

  def check_temperature
  end

  def change_temperature
  end
end

Session Controllers

The Code

What you'll need

let dispatcher = new WebSocketRails('localhost:9001/websocket'),
  task = {
    'name': 'Check temperature for driveway',
    'completed': false
  };

...

$scope.turnSensorsOn = function () {
  dispatcher.trigger('turn_on');
};

Some Javascript

A NEW CHALLENGER APPEARS

The Code

What you'll need

require 'artoo'

connection :spark, adaptor: :spark, 
  device_id: '343_GUILTY_SPARK', 
  access_token: 'xxxThE_TRuffLE_SHUffl3'
device :led, driver: :led, pin: 'D7' # light on spark

work do
  every 1.second do
    led.toggle
  end
end

Artoo-Spark

Closing Remarks

Ruby is great for prototyping, but is a challenge for building out full-fledged IoT applications.