Building the Internet of Things with Thingsquare and Contiki - day 1, part 2
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The document outlines a lab exercise involving a big red internet button connected to the Thingsquare IoT cloud. It details the setup process, including connecting the button, uploading a program that sends HTTP posts, and setting up a requestbin for data inspection. Additionally, it briefly explains the use of IPv6 in the context of the IoT, along with the RPL routing protocol for forming wireless networks.
Building the Internet of Things with Thingsquare and Contiki - day 1, part 2
- 1. Lab 1: Big Red Internet Button
- 2. + = IoT!
- 3. 1. Press the button 2. Post something to the Internet
- 4. The Big Red Button • Two connectors – Ground – Signal • 12 v built-in LED
- 5. The Thingsquare kit • CC2538 System-on-a-Chip board – The heart of it all – Runs Contiki • Display board – LCD screen – JTAG debugger • Ethernet router
- 7. The Thingsquare cloud • Connect your devices • Program your devices from your browser • Inspect the output
- 8. What we’ll do • Connect the button • Upload a program that does: – Reads the button – Does an HTTP POST to http://requestb.in/ • Inspect the output
- 9. Set up your device • Register the device with the Thingsquare cloud • Give it a name • Blink it
- 10. Set up the program • Create a new app – call it something unique – Like adam-button.c • Copy the contents of big-red-button.c – Don’t worry about the contents for now – we’ll go through all that
- 11. Set up a requestb.in • Go to http://requestb.in/ and create a RequestBin
- 12. RequestBin URL • Copy the RequestBin URL into the program: #define URL "http://requestb.in/abcdefghij" • • • • Run the program Press the button Reload the requestb.in page See the result
- 13. What we just did • Did an HTTP POST directly from the chip • Posted data via a webhook to a cloud service
- 14. Connecting a device to the IoT
- 15. The device
- 16. The Internet
- 18. IPv4
- 19. IPv6 IPv4
- 21. IPv6/IPv4 router
- 22. The App
- 24. Cloud
- 25. Cloud Websocket
- 26. Cloud API
- 27. IPv6 to IPv4 translation: NAT64 • Translate IPv4 addresses to IPv6 addresses – 192.168.1.1 becomes ::fffff:192.168.1.1 – Remember the port numbers
- 28. DNS64 • Translate DNS names to IPv6-mapped IPv4 address
- 30. api.example.com?
- 31. 198.51.100.28
- 34. The IPv6 mesh
- 35. IPv6 primer • Addresses are really long – 128 bits • Example – fe80::1234:abcd:5678:ef01 • A device has several IPv6 addresses
- 36. The IPv6 mesh • Contiki automatically forms a wireless IPv6 network – Routing protocol called RPL • The Ethernet router is the root of the network
- 37. A RPL Directed Acyclic Graph
- 38. The RPL DAG • Every DAG has a DAG ID – The IPv6 address of the root • Every DAG has a version number
- 39. Let’s look at the RPL mesh! • Go to Status -> Mesh on the kit display
- 40. The Mesh display • • • • • • • • • The DAG ID The parent IPv6 address The DAG version RPL rank Number of neighbors Number of routes Estimated number of hops ETX: RPL link quality indicator RSSI: Received Signal Strength Indicator
- 41. Hands-on experimentation • • • • Cusp your hand over the antenna Watch the ETX go up Might choose another parent Hop count will then increase
- 42. This is what happened
- 43. Our hand stopped the radio signals
- 44. A better route was found
- 45. Eventually the network recovers