thilo horstmann - 50000 lines of code to brew a coffee - code.talks 2015

c o d e . t a l k s 2 0 1 5 , H a m b u r g , S e p 3 0 t h 2 0 1 5

50000 LINES OF CODE TO BREW A COFFEE

Thilo Horstmann !@thilo

WHY THIS TALK?

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STRUCTURE AND TOPICS

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PROTOTYPES

TESTING

ENVIRONMENTS

SECURITY

agile approach

challenges

adopted approach

introduction

lessons learned

PROJECT OVERVIEW

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PRODUCT SYSTEM

CONNECTED PRODUCT

SMART PRODUCT

PRODUCT

KEY CHALLENGES

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STAY AGILE IN A GLOBAL PROJECT

KEY CHALLENGES

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GETTING THINGS CONNECTED

KEY CHALLENGES: GET CONNECTED

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KEY CHALLENGES

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EVERYTHING IS OFFLINE

KEY CHALLENGES

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USER FLOWS ACROSS DEVICES

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2

3

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6

7

KEY CHALLENGES

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THERE IS NO MACHINE

KEY CHALLENGES: GET THE UX RIGHT!

11Photo by Wikipedia/Terabass CC BY-SA 4.0

KEY CHALLENGES

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HTTPS?! JSON?! That’s just fancy candy for the internet kiddies… 01100111001101010101 !!!

PROTOTYPES

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PROTOTYPES

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DUMMIES

low fi hi fi

clickable

WALKING SKELETON

Hello World!

ALPHA

core functions

BETA

real users

RELEASE

live!

PROTOTYPES

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DUMMIES

USER TESTING / IDEATION

3D PRINTED

SPEAKERS TO MAKE COFFEE SOUNDS

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PROTOTYPES

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FAKE SERVICE

NEEDED TO IMPLEMENT APP / BACKEND

SOFTWARE THAT CAN RUN ON ANY DEV MACHINE

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PROTOTYPES

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FAKE MACHINE

WIFI SETUP DEVELOPMENT

BEAGLEBONE + NODE.JS

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PROTOTYPES

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THE BOX

SOME REAL HARDWARE

REAL USER CONTROLS

DOESN’T BREW COFFEE

Double-click to edit

PROTOTYPES

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FUNCTIONAL PROTOTYPE

and !nally …

… YEAH! SOME COFFEE :)

24Photo by Wikipedia/Takeaway CC BY-SA 4.0

PROTOTYPES

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DUMMIES WALKING SKELETON ALPHA BETA RELEASE

DUMMIES FAKE SERVICE

FAKE MACHINE

THE BOX

FUNCTIONAL PROTOTYPE

PROTOTYPES

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DUMMIES WALKING SKELETON ALPHA BETA RELEASE

DUMMIES FAKE SERVICE

FAKE MACHINE

THE BOX

FUNCTIONAL PROTOTYPE

minutes hours

weeks months

PROTOTYPES

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DUMMIES WALKING SKELETON ALPHA BETA RELEASE

DUMMIES FAKE SERVICE

FAKE MACHINE

THE BOX

FUNCTIONAL PROTOTYPE

FAKE SOFTWARE

REAL SOFTWARE

FAKE HARDWARE

REAL HARDWARE

TESTING

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“YOU CAN'T BE AGILE WHEN YOU'RE KNEE-DEEP IN MUD”

Martin Fowler

AGILE

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working software

fast feedback

respond to change

simplest solution

automation

small, continuous improvements

LIGHTWEIGHT FAST FLEXIBLE

TESTING

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unit

integration

functional

TESTING

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CONTINIOUS INTEGRATION FTW!

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TESTING

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CONTRACT TESTS

FAKE / GUIDED USER INTERACTION

PARTIAL USER JOURNEYS

ENVIRONMENTS

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ENVIRONMENTS

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DEV TEST PROD

db

backendclient

dev machine

client

cloud

backend

cloud

db

cloud

ENVIRONMENTS

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db backend

client simulator

dev machine

fake machine

DEV

ENVIRONMENTS

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TEST

client

phone

cloud

db

backend

fake machine

local device

wi!

fake machine

local device

wi!

real machine

local device

wi!

ENVIRONMENTS

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cloud desk

automatic manual

minutes hours

SECURITY

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SECURITY

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What is the agile approach to security?

cross functional teams

automated testing

automated provisioning

threat modelling

SECURITY

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scenario I: you break your own machine

oh…

SECURITY

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scenario II: you break somebody else’s machine

oh…

haha!

SECURITY

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scenario III: you break ALL machines

it doesn’t stop!

haha!

what happened?!

I want co"ee!

oh…

LESSONS LEARNED

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LESSONS LEARNED

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resources matter, hardware is hard to change software has to be build around it5

offline + complex user flows analyse more than you used to4

don’t reinvent the wheel when getting things connected3

automate more than you first think is possible2

co-locate with the hardware people1

THANK YOU! LET’S MEET AT OUR STANDThilo Horstmann - @thilo

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