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- Finally, it briefly touches on alternative hardware architectures like Project Ara and the Greybus standard, and asks whether a true Android-based platform can meet the needs of real-world IoT deployments.
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1. 1
Android Things:
Android for IoT
AnDevCon Washington D.C. 2017
Karim Yaghmour
+karimyaghmour, @karimyaghmour
karim.yaghmour@opersys.com
2. 2
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3. 3
About
● Author of:
● Introduced Linux Trace Toolkit in 1999
● Originated Adeos and relayfs (kernel/relay.c)
● Training, Custom Dev, Consulting, ...
4. 4
Agenda
1. A bit of history
2. Legacy Architectures
3. The Brillo/Weave Intermezzo
4. Now back to your regular programming
5. Hardware
6. “Things” Architecture
7. Images
8. User-Space
9. Services / Daemons
10.APIs
11.Apps
12.What if I told you ... ?
5. 5
1. A bit of history
● Embedded Linux
● Android
● Headless Android
● Brillo
● Android Things
6. 6
1.1. Embedded Linux
●
A set of ad-hoc methods to package the Linux kernel with a
(minimal) filesystem.
●
FS content “to be determined” case-by-case
● APIs are specific to each device/build
● “Core software”:
●
BusyBox
●
U-Boot
● GNU Toolchain
●
Your flavor of:
● glibc or uClibc or eglibc
●
yocto or buildroot or eldk or ltib or ptxdist or ...
● No serious UX framework
7. 7
1.2. Android
●
... apart from its ubiquitous UX ...
● Fully-integrated IDE: Android Studio
● SDK/NDK
● ADB
● Fastboot
● Published, well-known, and very rich APIs
● A large and growing developer community
● And still we can use “embedded Linux” components:
● GNU toolchain, BusyBox, u- boot, glibc, ...
An actual standardized dev. env. across all product lines
11. 11
1.4. Brillo / Weave
● Initial Google platform for IoT*
● Based on Android
● Announced at Google I/O 2015
● Never officially released
● Remained in “developer preview” mode
● Needed to sign up for developer preview on https://developers.google.com/brillo/
● Sources available from android.googlesource.com
● “Apps” talk straight to HALs
● Note:
Material here based on sources, NOT on developer preview or any information thereof :P
* New, hip way of talking about “Embedded Systems”, something that's been around for ~50+ years.
12. 12
1.5. Android Things
● “Reboot” of Google's Android IoT strategy
● Announced on Dec 13th, 2016
● Reinstates full Android environment
● Developers use existing Android dev tools
● C/C++ available through NDK
● Extended APIs for IoT
● Currently at Developer Preview 4.1 (5th release)
● Sources not yet available
24. 24
3.2. Sources
● Getting the sources
● Brillo top level
● Removed from Android top level
● Gone from external/
● New to external
25. 25
3.2.1. Getting the sources
● Same project repo as Android:
android.googlesource.com
● Different manifest file
● Using “repo”:
$ repo init u https://android.googlesource.com/brillo/manifest
$ repo sync
26. 26
3.2.2. Brillo top level
bionic C library replacement
bootable Reference bootloader
build Build system
device Device-specific files and components
external Copy of external projects used by AOSP
frameworks Native system services and libraries
hardware Hardware support libs
libnativehelper JNI helpers
prebuilts Prebuilt binaries
product “Products” running on Brillo
system Embedded Linux core
tools Brillo Development Kit
27. 27
3.2.3. Removed from Android top level
art
cts
dalvik
dvelopers
development
docs
frameworks/base and more
libcore
ndk
packages
pdk
sdk
system/vold and more
tools/external
34. 34
4. Now back to your regular
programming
● Android Things does away with most of Brillo
● Revert architecture to original
● Weave seems gone from the FS, but site still on
● Go back to system services with HALs
● Extend Android API for IoT
● Use of Android Studio and co.
● Optional Display
● Use of traditional static permissions
38. 38
8. User-Space
● Same FS layout as Android
● Mostly same processes
● In short, unlike Brillo, it's still very much Android
39. 39
9. Services / Daemons
● /system/bin/peripheralman
● C++ System Service
● Responds to dumpsys:
dumpsys com.google.android.things.pio.IPeripheralManager
● Also was in Brillo
● Sources (11 months old):
● https://android.googlesource.com/platform/system/peripheralmanager/
● New HAL:
● peripheral_io.h
● As with other HALs:
● /system/lib/hw/peripheral_io.<board_name>.so
43. 43
11. Apps
● New Launcher: IoTLauncher.apk
● Still responds to same intent as LauncherN.apk
– Try: aapt l -a IoTLauncher.apk
● Likely party firing android.intent.category.IOT_LAUNCHER
– Try: strings IoTLauncher.odex | grep IOT
● Gone:
● Home launcher (replaced by IoTLauncher)
● Status bar
● Settings (at least the content provider ... “ps” says the app is still running ;) )
● Interesting:
● Google services (some of them at least)
● Try:
● dumpsys gfxinfo
44. 44
12. What if I told you ... ?
● What's this IoT thing ... ?
● Consumer
● Industrial/Commercial
● 256MB+ RAM for an embedded device, really?
...
● A long time ago in a galaxy far far away ...