50000 Lines Of Code to Brew a Coffee

The slides of my presentation at code.talks 2015 in Hamburg

Abstract:
Over the last two years ThoughtWorks has been creating a software system and platform for a novel consumer IoT product. It is built on top of a micro service architecture running in the cloud with several end user devices including Web, iOS, Android and Wearable devices. Due to the different development cycles in hardware manufacturing we were facing a new layer of complexity. In this talk I give an overview of the technologies being used and how we adapted agile concepts and automated testing to survive in the complex world of connected devices.

https://www.codetalks.de/2015/programm/50000-lines-of-code-to-brew-a-coffee

Transcript

1. c o d e . t a l k s 2 0 1 5 , H a m b u r g , S e p 2 9 t h 2 0 1 5 50000 LINES OF CODE TO BREW A COFFEE Thilo Horstmann
 @thilo
2. WHY THIS TALK? 2
3. STRUCTURE AND TOPICS 3 PROTOTYPES TESTING ENVIRONMENTS SECURITY agile approach challenges adopted approach introduction lessons learned
4. PROJECT OVERVIEW 4 PRODUCT SYSTEM CONNECTED PRODUCT SMART PRODUCT PRODUCT
5. KEY CHALLENGES 5 STAY AGILE IN A GLOBAL PROJECT
6. KEY CHALLENGES 6 GETTING THINGS CONNECTED
7. KEY CHALLENGES: GET CONNECTED 7
8. KEY CHALLENGES 8 EVERYTHING IS OFFLINE
9. KEY CHALLENGES 9 USER FLOWS ACROSS DEVICES 1 2 3 4 5 6 7
10. KEY CHALLENGES 10 THERE IS NO MACHINE
11. KEY CHALLENGES: GET THE UX RIGHT! 11 Photo by Wikipedia/Terabass CC BY-SA 4.0
12. KEY CHALLENGES 12 HTTPS?! JSON?! That’s just fancy candy for the internet kiddies… 01100111001101010101 !!!
13. PROTOTYPES 13
14. PROTOTYPES 14 DUMMIES low fi hi fi clickable WALKING SKELETON Hello World! ALPHA core functions BETA real users RELEASE live!
15. PROTOTYPES 15 DUMMIES USER TESTING / IDEATION 3D PRINTED SPEAKERS TO MAKE COFFEE SOUNDS
17. PROTOTYPES 17 FAKE SERVICE NEEDED TO IMPLEMENT APP / BACKEND SOFTWARE THAT CAN RUN ON ANY DEV MACHINE
19. PROTOTYPES 19 FAKE MACHINE WIFI SETUP DEVELOPMENT BEAGLEBONE + NODE.JS
21. PROTOTYPES 21 THE BOX SOME REAL HARDWARE REAL USER CONTROLS DOESN’T BREW COFFEE
22. Double-click to edit
23. PROTOTYPES 23 FUNCTIONAL PROTOTYPE and finally …
24. … YEAH! SOME COFFEE :) 24 Photo by Wikipedia/Takeaway CC BY-SA 4.0
25. PROTOTYPES 25 DUMMIES WALKING SKELETON ALPHA BETA RELEASE DUMMIES FAKE SERVICE FAKE MACHINE THE BOX FUNCTIONAL PROTOTYPE
26. PROTOTYPES 26 DUMMIES WALKING SKELETON ALPHA BETA RELEASE DUMMIES FAKE SERVICE FAKE MACHINE THE BOX FUNCTIONAL PROTOTYPE minutes hours weeks months
27. PROTOTYPES 27 DUMMIES WALKING SKELETON ALPHA BETA RELEASE DUMMIES FAKE SERVICE FAKE MACHINE THE BOX FUNCTIONAL PROTOTYPE FAKE SOFTWARE REAL SOFTWARE FAKE HARDWARE REAL HARDWARE
28. TESTING 28
29. 29 “YOU CAN'T BE AGILE WHEN YOU'RE KNEE-DEEP IN MUD” Martin Fowler
30. AGILE 30 working software fast feedback respond to change simplest solution automation small, continuous improvements LIGHTWEIGHT FAST FLEXIBLE
31. TESTING 31 unit integration functional
32. TESTING 32
33. CONTINIOUS INTEGRATION FTW! 33
34. TESTING 34 CONTRACT TESTS FAKE / GUIDED USER INTERACTION PARTIAL USER JOURNEYS
35. ENVIRONMENTS 35
36. ENVIRONMENTS 36 DEV TEST PROD db backend client dev machine client cloud backend cloud db cloud
37. ENVIRONMENTS 37 db backend client simulator dev machine fake machine DEV
38. ENVIRONMENTS 38 TEST client phone cloud db backend fake machine local device wifi fake machine local device wifi real machine local device wifi
39. ENVIRONMENTS 39 cloud desk automatic manual minutes hours
40. SECURITY 40
41. SECURITY 41 What is the agile approach to security? cross functional teams automated testing automated provisioning threat modelling
42. SECURITY 42 scenario I: you break your own machine oh…
43. SECURITY 43 scenario II: you break somebody else’s machine oh… haha!
44. SECURITY 44 scenario III: you break ALL machines it doesn’t stop! haha! what happened?! I want coffee! oh…
45. LESSONS LEARNED 45
46. LESSONS LEARNED 46 resources matter, hardware is hard to change software has to be build around it 5 offline + complex user flows analyse more than you used to 4 don’t reinvent the wheel when getting things connected 3 automate more than you first think is possible 2 co-locate with the hardware people 1
47. THANK YOU! LET’S MEET AT OUR STAND Thilo Horstmann - @thilo 47