Making things that work with us - Distill
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The document discusses the Internet of Things and how devices and applications can communicate. It describes how devices often use lightweight protocols like MQTT that are optimized for low-power connectivity and publishing data, while applications typically use REST APIs. It then introduces Ponte, an open-source bridge that allows REST applications to access MQTT devices by translating between the two protocols. Ponte uses Node.js, MQTT.js, and Mosca to provide both an MQTT broker and REST interface for bridging the divide between "things" and web applications.
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Making things that work with us - Distill
- 4. Did you see it coming http://www.flickr.com/photos/12738000@N00/360231193/
- 7. 7:11 PMiPad How do we #code an App?
- 8. 7:11 PMiPad We #code a response to some kind of user action
- 9. Pop-up Dialog OK This message come from the server! Cancel Web ServerTap We #code a remote web server
- 10. Web and Mobile apps are based on HTTP REST
- 11. REpresentational State Tranfer = REST
- 12. What's next (hint: it's a big number) X0.000.000.000
- 13. X0.000.000.000 Number of connected “things” by 2020:
- 14. X0.000.000.000 Number of connected “things” by 2020: 1.000.000.000 Number of smartphones users in 2012
- 15. 10X
- 16. http://500px.com/photo/4766384 In the future, this chain will be connected to the Internet
- 18. http://500px.com/photo/26425201 We want to #code the real world.
- 19. Arduino is an open source microcontroller that you can use to hack things http://www.flickr.com/photos/mattrichardson/5029708468/
- 21. Control my house from GTalk or Twitter Goal:
- 22. I want to chat with my house
- 23. >: hi house hi matteo >: what's the temperature? 36 >: turn airconditioning on consider it done!
- 24. >: 4 8 15 16 23 42
- 25. Hubot © 2012 GitHub Inc. All rights Enter Hubot
- 26. Hubot © 2012 GitHub Inc. All rights A programmable robot that can receive commands through chat
- 27. We can supercharge my house with hubot
- 28. We can supercharge my house with hubot My house needs to: 1. publish sensed data to the web 2. receive commands from the web
- 29. Our control room is in the Cloud How can we send and receive the updates
- 30. In order to send commands to Things from the Web, we need to: 1. subscribe the Thing to some event 2. publish the new event
- 32. In order to publish live data, we need to: 1. sense it 2. send it in the cloud 3. build a web API to access it
- 33. Pidgeons are not a communication protocol See RFC1149 http://500px.com/photo/32895129
- 35. We need a fast, binary protocol http://www.flickr.com/photos/grrphoto/305649629
- 37. • Binary • Publish/Subscribe • Free • Standard (in a few months) • Offline/Disconnected mode
- 38. • 93x faster throughput • 11.89x less battery to send • 170.9x less battery to receive • 1/2 as much power to keep connection open • 8x less network overhead MQTT vs HTTPS for Mobile Push Notifications Source: http://mobilebit.wordpress.com/2013/05/03/rest-is-for-sleeping-mqtt-is-for-mobile/
- 39. How to use on
- 41. on Arduino: Setup String server = String("qest.me"); PubSubClient client = PubSubClient(server, 1883, callback);
- 42. if (!client.connected()) { client.connect("arduino"); } client.loop(); char s[10]; itoa(get_temperature(), s, 10); client.publish("temp", s); on Arduino: publishing
- 43. if (!client.connected()) { client.connect("arduino"); } client.loop(); char s[10]; itoa(get_temperature(), s, 10); client.publish("temp", s); This is called a topic, and it is where we publish data on MQTT. on Arduino: publishing
- 44. Your “thing” speaks MQTT. Your App speaks HTTP. http://500px.com/photo/35382862
- 45. Your App cannot serve two masters. http://500px.com/photo/35382862
- 46. http://500px.com/photo/31083423 We need a Bridge between the Web and the “Things” world
- 47. (bridge in Italian) http://eclipse.org/proposals/technology.ponte/ http://github.com/mcollina/ponte A M2M/IoT bridge for REST developers
- 48. • MQTT broker • REST interface • can be deployed on top of a lot pub/sub systems and databases • built in node.js ponte
- 49. ponte’s pillars • Node.js • Ascoltatori, the pub/sub library for node backed for every broker out there! npm.im/ascoltatori • Mosca, the multi-transport MQTT broker for node.js. npm.im/mosca • MQTT.js, the MQTT library for node: npm.im/mqtt
- 51. TL;DR • The Internet of Things will be big • Devices need binary formats and pub/sub protocols • Apps are built on top of REST APIs • Ponte does both
- 52. Matteo Collina (matteo.collina2@unibo.it) Thank You! @matteocollina http://www.flickr.com/photos/axel-d/479627824/