Android Things on Rpi3

Get a Rpi3 and follow the steps to flash the boot image to a SD card. Then, you are ready to explore.
I first hooked the HDMI output to my TV but the display is messy. But you can tell there is something on the screen, which is good sign that Android is running. Looks like the image stride is not correct. Probably the resolution doesn't match, e,g 1366x768 vs 1920x1080. I didn't dig further since I haven't get the adb working, yet.
It turned out adb over usb didn't work and the micro usb is for power only. So to get the adb, you have to connect the Ethernet cable (even you are very reluctant to do so as me) first and use adb over tcp.
$ adb devices
List of devices attached

$ adb connect Android.local
connected to Android.local:5555

$ adb devices
List of devices attached
Android.local:5555  device

$ adb shell
rpi3:/ $ 

As I said, I hate Ethernet, because I have no easy access to the Ethernet in my home office. So I want to set up the Wifi and use adb over it.
And, the doc says
Connect an Ethernet cable to your local network.
Note: You may also choose to connect over Wi-Fi.
That is misleanding, IMO. It sounds to me  you can use either Ethernet or Wifi. But, to connect to Wifi you should use adb shell commands, which means you have to connect to Ethernet first and then use adb command to connect to Wifi. The command provided works well. At least by checking the ifconfig output, wlan was assigned an IP address.
But doc here also says:
Network: Wi-Fi cannot connect to the internet if Ethernet is also connected to a network without internet access.
I have no idea what does that mean, especial the last few words.
As said, my purpose is to use the adb over Wifi, so I tried following steps but seems no luck. Maybe I messed up some steps or just didn't try enough times :)
1. Connect Ethernet
2. Connect adb over Ethernet
3. Setup Wifi using adb
4. Disconnect Ethernet
5. Reset the board and hope the Wifi will connect automatically
6. Connect adb over Wifi
With adb working, I can just dump a few things such as Partitions, Processes, Services and a few others. And, here are the (boring) dumps.

Partitions

A/B partition in place. Which is a mandatory feature for IoT device for effective seamless update.
rpi3:/ $ ls /dev/block/platform/soc/3f202000.sdhost/by-name/ -l                
total 0
lrwxrwxrwx 1 root root 20 1970-01-01 00:00 boot_a -> /dev/block/mmcblk0p4
lrwxrwxrwx 1 root root 20 1970-01-01 00:00 boot_b -> /dev/block/mmcblk0p5
lrwxrwxrwx 1 root root 21 1970-01-01 00:00 gapps_a -> /dev/block/mmcblk0p13
lrwxrwxrwx 1 root root 21 1970-01-01 00:00 gapps_b -> /dev/block/mmcblk0p14
lrwxrwxrwx 1 root root 21 1970-01-01 00:00 misc -> /dev/block/mmcblk0p10
lrwxrwxrwx 1 root root 21 1970-01-01 00:00 oem_a -> /dev/block/mmcblk0p11
lrwxrwxrwx 1 root root 21 1970-01-01 00:00 oem_b -> /dev/block/mmcblk0p12
lrwxrwxrwx 1 root root 20 1970-01-01 00:00 rpiboot -> /dev/block/mmcblk0p1
lrwxrwxrwx 1 root root 20 1970-01-01 00:00 system_a -> /dev/block/mmcblk0p6
lrwxrwxrwx 1 root root 20 1970-01-01 00:00 system_b -> /dev/block/mmcblk0p7
lrwxrwxrwx 1 root root 20 1970-01-01 00:00 uboot_a -> /dev/block/mmcblk0p2
lrwxrwxrwx 1 root root 20 1970-01-01 00:00 uboot_b -> /dev/block/mmcblk0p3
lrwxrwxrwx 1 root root 21 1970-01-01 00:00 userdata -> /dev/block/mmcblk0p15
lrwxrwxrwx 1 root root 20 1970-01-01 00:00 vbmeta_a -> /dev/block/mmcblk0p8
lrwxrwxrwx 1 root root 20 1970-01-01 00:00 vbmeta_b -> /dev/block/mmcblk0p9

Process

Notes: no Weaved, no Webserved.
USER      PID   PPID  VSIZE  RSS   WCHAN            PC  NAME
root      1     0     7336   1548           /init
root      2     0     0      0              kthreadd
root      3     2     0      0              ksoftirqd/0
root      5     2     0      0              kworker/0:0H
root      7     2     0      0              rcu_preempt
root      8     2     0      0              rcu_sched
root      9     2     0      0              rcu_bh
root      10    2     0      0              migration/0
root      11    2     0      0              migration/1
root      12    2     0      0              ksoftirqd/1
root      14    2     0      0              kworker/1:0H
root      15    2     0      0              migration/2
root      16    2     0      0              ksoftirqd/2
root      17    2     0      0              kworker/2:0
root      18    2     0      0              kworker/2:0H
root      19    2     0      0              migration/3
root      20    2     0      0              ksoftirqd/3
root      21    2     0      0              kworker/3:0
root      22    2     0      0              kworker/3:0H
root      23    2     0      0              kdevtmpfs
root      24    2     0      0              netns
root      25    2     0      0              perf
root      26    2     0      0              khungtaskd
root      27    2     0      0              writeback
root      28    2     0      0              ksmd
root      29    2     0      0              crypto
root      30    2     0      0              bioset
root      31    2     0      0              kblockd
root      33    2     0      0              cfg80211
root      34    2     0      0              rpciod
root      35    2     0      0              kswapd0
root      36    2     0      0              vmstat
root      37    2     0      0              fsnotify_mark
root      38    2     0      0              nfsiod
root      64    2     0      0              kthrotld
root      65    2     0      0              bioset
root      89    2     0      0              VCHIQ-0
root      90    2     0      0              VCHIQr-0
root      91    2     0      0              VCHIQs-0
root      92    2     0      0              iscsi_eh
root      93    2     0      0              spi0
root      94    2     0      0              dwc_otg
root      95    2     0      0              DWC Notificatio
root      96    2     0      0              VCHIQka-0
root      97    2     0      0              dm_bufio_cache
root      98    2     0      0              kworker/u8:1
root      99    2     0      0              irq/92-mmc1
root      100   2     0      0              bioset
root      101   2     0      0              mmcqd/0
root      102   2     0      0              binder
root      103   2     0      0              kworker/1:1
root      104   2     0      0              ipv6_addrconf
root      105   2     0      0              SMIO
root      106   2     0      0              deferwq
root      108   2     0      0              kworker/0:2
root      109   2     0      0              brcmf_wq/mmc1:0
root      110   2     0      0              brcmf_wdog/mmc1
root      114   2     0      0              jbd2/mmcblk0p6-
root      115   2     0      0              ext4-rsv-conver
root      116   1     2932   1132           /sbin/ueventd
root      121   2     0      0              jbd2/mmcblk0p15
root      122   2     0      0              ext4-rsv-conver
root      123   2     0      0              jbd2/mmcblk0p11
root      124   2     0      0              ext4-rsv-conver
root      125   2     0      0              jbd2/mmcblk0p13
root      126   2     0      0              ext4-rsv-conver
logd      127   1     11676  2700           /system/bin/logd
root      128   1     5344   2208           /system/bin/debuggerd
root      129   1     11784  4632           /system/bin/vold
root      134   2     0      0              kauditd
root      137   128   5088   508            debuggerd:signaller
root      145   1     2992   496            /sbin/healthd
root      146   1     4560   2412           /system/bin/lmkd
system    147   1     4600   1928           /system/bin/servicemanager
system    148   1     30480  12760          /system/bin/surfaceflinger
shell     150   1     9272   820            /sbin/adbd
root      151   1     965944 94544          zygote
audioserver 153   1     21844  7644         /system/bin/audioserver
cameraserver 154   1     14512  6516        /system/bin/cameraserver
drm       155   1     13316  5876           /system/bin/drmserver
root      156   1     4972   2052           /system/bin/installd
keystore  157   1     7476   3624           /system/bin/keystore
mediacodec 158   1     12968  5668          media.codec
media     159   1     17108  7672           /system/bin/mediadrmserver
mediaex   160   1     37784  7056           media.extractor
media     161   1     39664  9588           /system/bin/mediaserver
root      162   1     24916  3892           /system/bin/netd
root      163   1     9016   3948           /system/bin/peripheralman
root      165   1     3540   1876           /system/bin/sh
system    166   1     7236   2780           /system/bin/gatekeeperd
system    167   1     7060   3768           /system/bin/userinputdriverservice
metrics_coll 168   1     9152   4752        /system/bin/metrics_collector
metricsd  169   1     10868  4888           /system/bin/metricsd
root      175   1     4100   1876           /system/xbin/perfprofd
root      176   1     10072  6028           /system/bin/update_engine
mdnsr     179   1     2004   688            /system/bin/mdnsd
system    410   151   1088328 124132        /system_server
media_rw  479   129   8236   2668           /system/bin/sdcard
wifi      517   1     7572   3932           /system/bin/wpa_supplicant
system    541   151   1069296 72760         com.android.settings
u0_a5     571   151   1037892 57084         android.ext.services
u0_a4     599   151   1044800 70048         android.process.media
system    618   151   1045744 71300         com.android.iotlauncher
u0_a7     643   151   1179200 92776         com.google.android.gms.feedback
u0_a7     658   151   1213404 147912        com.google.android.gms.persistent
u0_a8     684   151   1039576 57448         com.android.managedprovisioning
u0_a9     698   151   1037816 56488         com.android.onetimeinitializer
u0_a1     715   151   1040192 64552         com.android.providers.calendar
u0_a7     730   151   1051700 71176         com.google.process.gapps
u0_a7     772   151   1333476 156352        com.google.android.gms
radio     864   151   1040476 62692         com.android.phone
u0_a2     896   151   1047240 73176         android.process.acore
u0_a7     949   151   1179200 94860         com.google.android.gms.ui

Services

Found 110 services:
0   gpsdriverservice: [com.google.android.things.userdriver.IGpsDriverService]
1   contexthub_service: [android.hardware.location.IContextHubService]
2   dns_listener: [android.net.metrics.IDnsEventListener]
3   connectivity_metrics_logger: [android.net.IConnectivityMetricsLogger]
4   imms: [com.android.internal.telephony.IMms]
5   media_projection: [android.media.projection.IMediaProjectionManager]
6   launcherapps: [android.content.pm.ILauncherApps]
7   shortcut: [android.content.pm.IShortcutService]
8   trust: [android.app.trust.ITrustManager]
9   media_router: [android.media.IMediaRouterService]
10  media_session: [android.media.session.ISessionManager]
11  restrictions: [android.content.IRestrictionsManager]
12  graphicsstats: [android.view.IGraphicsStats]
13  assetatlas: [android.view.IAssetAtlas]
14  dreams: [android.service.dreams.IDreamManager]
15  commontime_management: []
16  network_time_update_service: []
17  samplingprofiler: []
18  diskstats: []
19  appwidget: [com.android.internal.appwidget.IAppWidgetService]
20  soundtrigger: [com.android.internal.app.ISoundTriggerService]
21  jobscheduler: [android.app.job.IJobScheduler]
22  hardware_properties: [android.os.IHardwarePropertiesManager]
23  serial: [android.hardware.ISerialManager]
24  DockObserver: []
25  audio: [android.media.IAudioService]
26  wallpaper: [android.app.IWallpaperManager]
27  dropbox: [com.android.internal.os.IDropBoxManagerService]
28  search: [android.app.ISearchManager]
29  country_detector: [android.location.ICountryDetector]
30  location: [android.location.ILocationManager]
31  devicestoragemonitor: []
32  notification: [android.app.INotificationManager]
33  recovery: [android.os.IRecoverySystem]
34  updatelock: [android.os.IUpdateLock]
35  servicediscovery: [android.net.nsd.INsdManager]
36  connectivity: [android.net.IConnectivityManager]
37  ethernet: [android.net.IEthernetManager]
38  rttmanager: [android.net.wifi.IRttManager]
39  wifiscanner: [android.net.wifi.IWifiScanner]
40  wifi: [android.net.wifi.IWifiManager]
41  wifip2p: [android.net.wifi.p2p.IWifiP2pManager]
42  netpolicy: [android.net.INetworkPolicyManager]
43  netstats: [android.net.INetworkStatsService]
44  network_score: [android.net.INetworkScoreService]
45  textservices: [com.android.internal.textservice.ITextServicesManager]
46  network_management: [android.os.INetworkManagementService]
47  clipboard: [android.content.IClipboard]
48  statusbar: [com.android.internal.statusbar.IStatusBarService]
49  device_policy: [android.app.admin.IDevicePolicyManager]
50  deviceidle: [android.os.IDeviceIdleController]
51  lock_settings: [com.android.internal.widget.ILockSettings]
52  uimode: [android.app.IUiModeManager]
53  mount: [IMountService]
54  accessibility: [android.view.accessibility.IAccessibilityManager]
55  input_method: [com.android.internal.view.IInputMethodManager]
56  pinner: []
57  vrmanager: [android.service.vr.IVrManager]
58  input: [android.hardware.input.IInputManager]
59  window: [android.view.IWindowManager]
60  alarm: [android.app.IAlarmManager]
61  consumer_ir: [android.hardware.IConsumerIrService]
62  vibrator: [android.os.IVibratorService]
63  content: [android.content.IContentService]
64  account: [android.accounts.IAccountManager]
65  media.camera.proxy: [android.hardware.ICameraServiceProxy]
66  telephony.registry: [com.android.internal.telephony.ITelephonyRegistry]
67  scheduling_policy: [android.os.ISchedulingPolicyService]
68  webviewupdate: [android.webkit.IWebViewUpdateService]
69  usagestats: [android.app.usage.IUsageStatsManager]
70  battery: []
71  sensorservice: [android.gui.SensorServer]
72  sensordriverservice: [com.google.android.things.userdriver.ISensorDriverService]
73  processinfo: [android.os.IProcessInfoService]
74  permission: [android.os.IPermissionController]
75  cpuinfo: []
76  dbinfo: []
77  gfxinfo: []
78  meminfo: []
79  procstats: [com.android.internal.app.procstats.IProcessStats]
80  activity: [android.app.IActivityManager]
81  user: [android.os.IUserManager]
82  otadexopt: [android.content.pm.IOtaDexopt]
83  package: [android.content.pm.IPackageManager]
84  display: [android.hardware.display.IDisplayManager]
85  power: [android.os.IPowerManager]
86  appops: [com.android.internal.app.IAppOpsService]
87  batterystats: [com.android.internal.app.IBatteryStats]
88  netd: [android.net.INetd]
89  media.camera: [android.hardware.ICameraService]
90  media.drm: [android.media.IMediaDrmService]
91  media.resource_manager: [android.media.IResourceManagerService]
92  media.player: [android.media.IMediaPlayerService]
93  media.extractor: [android.media.IMediaExtractorService]
94  media.sound_trigger_hw: [android.hardware.ISoundTriggerHwService]
95  media.radio: [android.hardware.IRadioService]
96  media.audio_policy: [android.media.IAudioPolicyService]
97  media.audio_flinger: [android.media.IAudioFlinger]
98  drm.drmManager: [drm.IDrmManagerService]
99  media.codec: [android.media.IMediaCodecService]
100 android.brillo.UpdateEngineService: [android.brillo.IUpdateEngine]
101 android.brillo.metrics.IMetricsCollectorService: [android.brillo.metrics.IMetricsCollectorService]
102 gpu: [android.ui.IGpuService]
103 SurfaceFlinger: [android.ui.ISurfaceComposer]
104 batteryproperties: [android.os.IBatteryPropertiesRegistrar]
105 android.brillo.metrics.IMetricsd: [android.brillo.metrics.IMetricsd]
106 com.google.android.things.pio.IPeripheralManager: [com.google.android.things.pio.IPeripheralManager]
107 inputdriverservice: [com.google.android.things.userdriver.IInputDriverService]
108 android.security.keystore: [android.security.IKeystoreService]
109 android.service.gatekeeper.IGateKeeperService: [android.service.gatekeeper.IGateKeeperService]

Things/Brillo specific services

0   gpsdriverservice: [com.google.android.things.userdriver.IGpsDriverService]
72  sensordriverservice: [com.google.android.things.userdriver.ISensorDriverService]
106 com.google.android.things.pio.IPeripheralManager: [com.google.android.things.pio.IPeripheralManager]
107 inputdriverservice: [com.google.android.things.userdriver.IInputDriverService]

100 android.brillo.UpdateEngineService: [android.brillo.IUpdateEngine]
101 android.brillo.metrics.IMetricsCollectorService: [android.brillo.metrics.IMetricsCollectorService]
105 android.brillo.metrics.IMetricsd: [android.brillo.metrics.IMetricsd]

props

rpi3:/ $ getprop                                                               
[camera.disable_zsl_mode]: [1]
[crash_reporter.coredump.enabled]: [1]
[dalvik.vm.appimageformat]: [lz4]
[dalvik.vm.dex2oat-Xms]: [64m]
[dalvik.vm.dex2oat-Xmx]: [512m]
[dalvik.vm.heapsize]: [256m]
[dalvik.vm.image-dex2oat-Xms]: [64m]
[dalvik.vm.image-dex2oat-Xmx]: [64m]
[dalvik.vm.isa.arm.features]: [default]
[dalvik.vm.isa.arm.variant]: [generic]
[dalvik.vm.lockprof.threshold]: [500]
[dalvik.vm.stack-trace-file]: [/data/anr/traces.txt]
[dalvik.vm.usejit]: [true]
[dalvik.vm.usejitprofiles]: [true]
[debug.atrace.tags.enableflags]: [0]
[debug.force_rtl]: [0]
[dev.bootcomplete]: [1]
[init.svc.adbd]: [running]
[init.svc.audioserver]: [running]
[init.svc.bootanim]: [stopped]
[init.svc.cameraserver]: [running]
[init.svc.console]: [running]
[init.svc.crash_reporter]: [stopped]
[init.svc.crash_sender]: [running]
[init.svc.debuggerd]: [running]
[init.svc.drm]: [running]
[init.svc.gatekeeperd]: [running]
[init.svc.healthd]: [running]
[init.svc.inputdriverserv]: [running]
[init.svc.installd]: [running]
[init.svc.keystore]: [running]
[init.svc.lmkd]: [running]
[init.svc.logd]: [running]
[init.svc.logd-reinit]: [stopped]
[init.svc.mdnsd]: [running]
[init.svc.media]: [running]
[init.svc.mediacodec]: [running]
[init.svc.mediadrm]: [running]
[init.svc.mediaextractor]: [running]
[init.svc.metricscollector]: [running]
[init.svc.metricsd]: [running]
[init.svc.netd]: [running]
[init.svc.perfprofd]: [running]
[init.svc.peripheralman]: [running]
[init.svc.servicemanager]: [running]
[init.svc.surfaceflinger]: [running]
[init.svc.ueventd]: [running]
[init.svc.update_engine]: [running]
[init.svc.vold]: [running]
[init.svc.wpa_supplicant]: [running]
[init.svc.zygote]: [running]
[log.tag.Hyphenator]: [SUPPRESS]
[log.tag.WifiHAL]: [D]
[net.bt.name]: [Android]
[net.change]: [net.dns3]
[net.dns1]: [211.29.132.12]
[net.dns2]: [198.142.0.51]
[net.dns3]: [198.142.235.14]
[net.hostname]: [android-226a3ebfc34ad1f3]
[net.qtaguid_enabled]: [1]
[net.tcp.default_init_rwnd]: [60]
[persist.sys.dalvik.vm.lib.2]: [libart.so]
[persist.sys.profiler_ms]: [0]
[persist.sys.usb.config]: [adb]
[persist.sys.webview.vmsize]: [104857600]
[pm.dexopt.ab-ota]: [speed-profile]
[pm.dexopt.bg-dexopt]: [speed-profile]
[pm.dexopt.boot]: [verify-profile]
[pm.dexopt.core-app]: [speed]
[pm.dexopt.first-boot]: [interpret-only]
[pm.dexopt.forced-dexopt]: [speed]
[pm.dexopt.install]: [interpret-only]
[pm.dexopt.nsys-library]: [speed]
[pm.dexopt.shared-apk]: [speed]
[qemu.gles]: [-1]
[ro.allow.mock.location]: [0]
[ro.baseband]: [unknown]
[ro.board.platform]: []
[ro.boot.hardware]: [rpi3]
[ro.boot.selinux]: [permissive]
[ro.boot.slot_suffix]: [_a]
[ro.bootimage.build.date]: [Mon Dec 12 20:53:57 UTC 2016]
[ro.bootimage.build.date.utc]: [1481576037]
[ro.bootimage.build.fingerprint]: [generic/iot_rpi3/rpi3:7.0/NIF73/3565696:userdebug/test-keys]
[ro.bootloader]: [unknown]
[ro.bootmode]: [unknown]
[ro.build.ab_update]: [true]
[ro.build.characteristics]: [default]
[ro.build.date]: [Mon Dec 12 20:53:57 UTC 2016]
[ro.build.date.utc]: [1481576037]
[ro.build.description]: [iot_rpi3-userdebug 7.0 NIF73 3565696 test-keys]
[ro.build.display.id]: [iot_rpi3-userdebug 7.0 NIF73 3565696 test-keys]
[ro.build.fingerprint]: [generic/iot_rpi3/rpi3:7.0/NIF73/3565696:userdebug/test-keys]
[ro.build.flavor]: [iot_rpi3-userdebug]
[ro.build.host]: [vpeb11.mtv.corp.google.com]
[ro.build.id]: [NIF73]
[ro.build.product]: [rpi3]
[ro.build.system_root_image]: [true]
[ro.build.tags]: [test-keys]
[ro.build.type]: [userdebug]
[ro.build.user]: [android-build]
[ro.build.version.all_codenames]: [REL]
[ro.build.version.base_os]: []
[ro.build.version.codename]: [REL]
[ro.build.version.incremental]: [3565696]
[ro.build.version.preview_sdk]: [0]
[ro.build.version.release]: [7.0]
[ro.build.version.sdk]: [24]
[ro.build.version.security_patch]: [2016-12-05]
[ro.carrier]: [unknown]
[ro.config.alarm_alert]: [Alarm_Classic.ogg]
[ro.config.notification_sound]: [OnTheHunt.ogg]
[ro.crypto.state]: [unsupported]
[ro.dalvik.vm.native.bridge]: [0]
[ro.debuggable]: [1]
[ro.hardware]: [rpi3]
[ro.hardware.camera]: [v4l2]
[ro.hardware.gps]: [iot]
[ro.hardware.sensors]: [iot]
[ro.kernel.qemu]: [1]
[ro.kernel.qemu.force_gles]: [-1]
[ro.product.board]: [rpi3]
[ro.product.brand]: [generic]
[ro.product.cpu.abi]: [armeabi-v7a]
[ro.product.cpu.abi2]: [armeabi]
[ro.product.cpu.abilist]: [armeabi-v7a,armeabi]
[ro.product.cpu.abilist32]: [armeabi-v7a,armeabi]
[ro.product.cpu.abilist64]: []
[ro.product.device]: [rpi3]
[ro.product.manufacturer]: [unknown]
[ro.product.model]: [iot_rpi3]
[ro.product.name]: [iot_rpi3]
[ro.revision]: [0]
[ro.runtime.firstboot]: [59481]
[ro.secure]: [1]
[ro.serialno]: []
[ro.wifi.channels]: []
[ro.zygote]: [zygote32]
[security.perf_harden]: [1]
[selinux.reload_policy]: [1]
[service.bootanim.exit]: [1]
[sys.boot_completed]: [1]
[sys.sysctl.extra_free_kbytes]: [12294]
[sys.sysctl.tcp_def_init_rwnd]: [60]
[sys.usb.config]: [adb]
[sys.usb.configfs]: [0]
[sys.usb.state]: [adb]
[vold.has_adoptable]: [0]
[wifi.interface]: [wlan0]
[wifi.supplicant_scan_interval]: [15]
[wlan.driver.status]: [ok]

Graphic/Display

Only one layer, a full screen iotlauncher. Built-in screen is 1366x768.
$ dumpsys SurfaceFlinger
Build configuration: [sf] [libui] [libgui]
Sync configuration: [using: EGL_KHR_fence_sync]

Visible layers (count = 1)
+ Layer 0xb11dc400 (com.android.iotlauncher/com.android.iotlauncher.IoTLauncher)

Displays (1 entries)
+ DisplayDevice: Built-in Screen
   type=0, hwcId=0, layerStack=0, (1366x 768), ANativeWindow=0xb08aa008, orient= 0 (type=00000000), flips=1254, isSecure=1, powerMode=2, activeConfig=0, numLayers=1
   v:[0,0,1366,768], f:[0,0,1366,768], s:[0,0,1366,768],transform:[[1.000,0.000,-0.000][0.000,1.000,-0.000][0.000,0.000,1.000]]

SurfaceFlinger global state:
EGL implementation : 1.2 Android Driver 1.2.0
EGL_KHR_fence_sync EGL_KHR_image_base EGL_ANDROID_image_native_buffer EGL_ANDROID_swap_rectangle 
GLES: Android, Android PixelFlinger 1.4, OpenGL ES-CM 1.0
GL_EXT_debug_marker GL_OES_byte_coordinates GL_OES_fixed_point GL_OES_single_precision GL_OES_read_format GL_OES_compressed_paletted_texture GL_OES_draw_texture GL_OES_matrix_get GL_OES_query_matrix GL_OES_EGL_image GL_OES_EGL_sync GL_OES_compressed_ETC1_RGB8_texture GL_ARB_texture_compression GL_ARB_texture_non_power_of_two GL_ANDROID_user_clip_plane GL_ANDROID_vertex_buffer_object GL_ANDROID_generate_mipmap 
  Region undefinedRegion (this=0xb11f82ac, count=1)
    [  0,   0,   0,   0]
  orientation=0, isDisplayOn=1
  last eglSwapBuffers() time: 21.146000 us
  last transaction time     : 33.385000 us
  transaction-flags         : 00000000
  refresh-rate              : 60.000002 fps
  x-dpi                     : 159.891235
  y-dpi                     : 159.895081
  gpu_to_cpu_unsupported    : 0
  eglSwapBuffers time: 0.000000 us
  transaction time: 0.000000 us
h/w composer state:
  h/w composer not present and enabled
Allocated buffers:
0xb0e1a2c0: 4098.00 KiB | 1366 (1366) x  768 |        1 | 0x00000933
0xb1197340: 2049.00 KiB | 1366 (1366) x  768 |        4 | 0x00001a33
0xb1197440: 2049.00 KiB | 1366 (1366) x  768 |        4 | 0x00001a33
0xb1197900: 4098.00 KiB | 1366 (1366) x  768 |        1 | 0x00000933
Total allocated (estimate): 12294.00 KB

Camera

Used v4l2 camera HAL. Obviously, it means the camera support is not complete since the standard v4l2 interfaces aren't sufficient to support a full Android camera v3. This was one of the problem Project Ara team tried to solve and there are some relevant discussion ongoing in the v4l2 kernel community.
$ dumpsys media.camera
Camera module HAL API version: 0x100
Camera module API version: 0x204
Camera module name: V4L2 Camera HAL v3
Camera module author: The Android Open Source Project
Number of camera devices: 0
Number of normal camera devices: 0