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Description:

gazoodevice 1.123.0

Gazoo Device Manager (GDM)
gazoo_device is a python package for interacting with smart devices.
It contains Gazoo Device Manager (GDM), which defines a common device interface.
The common device interface standardizes device interactions and allows test
writers to share tests across devices despite the underlying differences in
communication types, OSes, and logic.
GDM is available as a Python package for use in tests and comes with its own CLI
for quick device interactions.
GDM is the open-source architecture which enables device-agnostic interations.
Device controllers used by GDM are contained in separate Python packages and can
be registered with the GDM architecture.
GDM runs on the test host and communicates with the physical devices via one or
more device transports (such as SSH, ADB, HTTPS, UART). GDM does not require any
additional support from the device firmware.
GDM is used in most end-to-end device tests at Google Nest.
Table of contents

Install

Uninstall

Quick start
Device controllers in GDM
Config files
Logs
Detecting devices
Using the CLI

Exploring device capabilities without a physical device
Exploring device capabilities with a physical device
Basic CLI usage

Using the gazoo_device python package
How to use GDM with test frameworks

GDM with Mobly
GDM with Unittest

Contributor documentation
License
Disclaimer

Install
Supported host operating systems:

Debian;
Ubuntu;
MacOS.

Windows is not supported.
Note: Raspberry Pi 4 on 64-bit Ubuntu 20.04 LTS is also supported as a host (see
the relevant device setup section).
MacOS prerequisites:

Install Xcode Command Line Tools:
xcode-select --install

Install Brew (MacOS package manager):
https://brew.sh/

Verify your system python3 executable.

Check that Python 3 is available:
which python3

Check that your Python 3 version is at least 3.9:
python3 -V

Check that your python3 executable has pip module:
python3 -m pip --version

Installation steps:

Download the GDM installer archive:
curl -OL https://github.com/google/gazoo-device/releases/latest/download/gdm-install.sh

Run the installer:
bash gdm-install.sh

You should see the following message at the end of the installation:
Install done (exit 0)

Add gdm to your $PATH:
Add the following line to ~/.bash_profile or ~/.bashrc:
export PATH="${PATH}:${HOME}/gazoo/bin"

[Optional] Install optional dependencies

Some of GDM's dependencies are optional and are not installed by the
installer automatically due to licensing restrictions.
To enable flashing NRF52840 DK and EFR32 dev boards through GDM, install the
J-Link SDK:
https://www.segger.com/downloads/jlink/#J-LinkSoftwareAndDocumentationPack.
Additional note to Apple M1 users:
Make sure to download "64-bit Apple M1 Installer" under macOS.
To determine whether your Mac is using an M1 chip, run
arch

in terminal. If you see arm64, then your Mac is using M1.

To enable flashing ESP32 dev boards through GDM, install esptool:
~/gazoo/gdm/virtual_env/bin/pip install esptool==4.1

GDM installation creates a virtual environment for the CLI at
~/gazoo/gdm/virtual_env.
gdm CLI commands run in this virtual environment.
Run a few GDM CLI commands to verify GDM works:
gdm -v
gdm devices
gdm

gdm -v displays versions of the GDM launcher and of the python package:
Gazoo Device Manager launcher 1.0
Gazoo Device Manager 1.0.0

Typical output of gdm devices:
Device Alias Type Model Connected
--------------- --------------- ----------- ---------------- ------------

Other Devices Alias Type Model Available
--------------- --------------- ----------- ---------------- ------------

0 total Gazoo device(s) available.

gdm displays a help menu.
To update GDM to the latest version:
gdm update-gdm

To update (or downgrade) GDM to a specific version:
gdm update-gdm <version> # Example: gdm update-gdm 1.0.0

To install GDM in a virtual environment:
/path_to_virtual_env/bin/pip install gazoo-device

Uninstall
To uninstall GDM:
curl -OL https://github.com/google/gazoo-device/releases/latest/download/gdm-cleanup.sh
bash gdm-cleanup.sh

Quick start
This is the quickest way to get your hands dirty with GDM. You will need a
Raspberry Pi.

Install GDM on the host.
Set up your Raspberry Pi as an auxiliary device in GDM and try out the CLI.
Run the example on-device test with a test framework of your choice.

Device controllers in GDM
To interact with devices, GDM creates one Python device controller object for
each physical device. The lifecycle of GDM device controllers is as follows:

a new device is connected to the host and is detected by GDM (one-time setup
step), which makes the device known to GDM:
gdm detect

a device controller instance is created at the beginning of a test or a CLI
device interaction;

one or more device commands are issued through the device controller
instance;

the device controller instance is closed when the test is finished or the
CLI interaction completes;

if the device is permanently disconnected from the host, it is removed from
the list of devices known to GDM (also a one-time step) through
gdm delete device-1234

Note that the term "device" is ambiguous in the context of GDM: it can refer to
either the device controller or the physical device. Device controllers can also
be referred to as device classes.
Config files
GDM device configs are found in ~/gazoo/gdm/conf.
You should not modify them directly. Instead, use set-prop and get-prop
commands:

To set an optional device property:
gdm set-prop device-1234 property-name property-value

To retrieve a device property:
gdm get-prop device-1234 property-name

To set a Manager property:
gdm set-prop manager property-name property-value

To retrieve a Manager property:
gdm get-prop manager property-name

Logs
By default all GDM logs go to ~/gazoo/gdm/log/. Log verbosity, output
directory, and standard output behavior can be configured via arguments to
Manager.__init__ (see gazoo_device/manager.py).
GDM creates three types of log files.
The gdm.txt log
All GDM logs go here. Device logs are not captured in this file. This log
file persists across GDM invocations. It provides the best history, but it can
be difficult to pinpoint the logs for a particular device interaction.
Device log files, such as linuxexample-1eb2-20201113-123538.txt
These capture all communications between GDM and the device. Each log line is
prefixed with GDM-<letter_or_digit>, such as GDM-M, GDM-0, or GDM-1.
GDM-M are logs written by GDM. These include the commands that GDM wrote, the
regular expressions GDM expects to find after writing a command and the maximum
time window for the response, and the result of the expect (which regular
expression matched, if any).
GDM-0, GDM-1, and other GDM-<digit> logs come from device transports. The
digit corresponds to the index of the transport (as defined by
get_transport_list() methods of communication types in
gazoo_device/switchboard/communication_types.py).

For some communication types, such as SSH and ADB, logs and command responses
come from different transports. In that case device responses come from GDM-0
and device logs come from GDM-1.
For other communication types, there may only be a single transport, in which
case both device responses and logs come from GDM-0.
The names of device log files are logged during every CLI interaction. For
example: linuxexample-1eb2 logging to file /Users/artorl/gdm/log/linuxexample-1eb2-20201113-123548.txt
Device log event files, such as linuxexample-1eb2-20201113-123548-events.txt
These contain device log events. The log events to be captured are defined by
log event filters in gazoo_device/filters/.
A log filtering process receives all device logs in real time and captures lines
which match any of the device log filters into the device log event file.
The name of the log event file is constructed as
<name_of_log_file>-events.txt. For example,
linuxexample-1eb2-20201113-123548-events.txt is the log event file for the
linuxexample-1eb2-20201113-123548.txt device log file.
Detecting devices
To detect all devices attached to your host, run gdm detect on the host. This
is a one-time step that is required when GDM is installed on the host or when a
new device is connected to the host. Devices typically require a special setup
before being usable with GDM. This can include a special cable connection
configuration, renaming serial cables, updating device firmware to a specific
version, setting up the device on a static IP address, or setting up
passwordless SSH access to the device. Refer to
docs/device_setup/ for instructions.
Device detection populates device configs:

persistent properties are stored in ~/gazoo/gdm/conf/devices.json;
optional (settable) properties are stored in
~/gazoo/gdm/conf/device_options.json.

To view all devices currently known to GDM, run gdm devices.
Sample detection output (cambrionix-kljo was detected):
$ gdm detect

##### Step 1/3: Detecting potential new communication addresses. #####

detecting potential AdbComms communication addresses
detecting potential DockerComms communication addresses
'docker' is not installed. Cannot get Docker devices.
detecting potential JlinkSerialComms communication addresses
detecting potential PtyProcessComms communication addresses
detecting potential SshComms communication addresses
detecting potential SerialComms communication addresses
detecting potential YepkitComms communication addresses
'ykushcmd' is not installed. Cannot get Yepkit serials.
detecting potential PigweedSerialComms communication addresses
Found 1 possible serialcomms connections:
/dev/tty.usbserial-DM01KLJO

##### Step 2/3 Identify Device Type of Connections. #####

Identifying serialcomms devices..
/dev/tty.usbserial-DM01KLJO is a cambrionix.
serialcomms device_type detection complete.

##### Step 3/3: Extract Persistent Info from Detected Devices. #####

Getting info from communication port /dev/tty.usbserial-DM01KLJO for cambrionix
cambrionix_detect checking device readiness: attempt 1 of 1
cambrionix_detect starting AuxiliaryDevice.check_device_ready
cambrionix_detect health check 1/2 succeeded: Check device connected.
cambrionix_detect health check 2/2 succeeded: Check clear flags.
cambrionix_detect AuxiliaryDevice.check_device_ready successful. It took 0s.
cambrionix_detect starting Cambrionix.get_detection_info
cambrionix_detect Cambrionix.get_detection_info successful. It took 0s.

##### Detection Summary #####

1 new devices detected:
cambrionix-kljo
Device Alias Type Model Connected
-------------------------- --------------- -------------------- -------------------- ----------

Other Devices Alias Type Model Available
-------------------------- --------------- -------------------- -------------------- ----------
cambrionix-kljo <undefined> cambrionix PP15S available

0 total Gazoo device(s) available.

Device names are created as devicetype-1234, where the device type is provided
by the device controller, and the digits are the last 4 digits of the device's
serial number.
Detection only detects new devices. It does not re-detect already known
devices.

To delete a known device:
gdm delete device-1234

To redetect a device:
gdm redetect device-1234

Using the CLI
Exploring device capabilities without a physical device
GDM comes equipped with auto-generated documentation. To access it, you do not
need a device.
To see all commands available through the Manager class, run:
gdm

To start exploring device documentation, run:
gdm man

It will list all supported devices and provide commands to run if you are
interested in exploring capabilities of a specific device.
To see what is supported by a device type:
gdm man device_type

For example:
gdm man raspberrypi

To explore a device method, property, or capability, issue:
gdm man device_type attribute_name

For example:
gdm man raspberrypi firmware_version
gdm man raspberrypi reboot
gdm man raspberrypi file_transfer

To explore a capability method or property, issue:
gdm man device_type capability_name method_or_property_name

For example:
gdm man cambrionix switch_power off
gdm man raspberrypi file_transfer send_file_to_device

You can also explore GDM functionality via the dynamic Fire CLI. For example:
gdm -- --help
gdm create_device -- --help

Exploring device capabilities with a physical device
If you have a physical device, you can use the dynamic Fire CLI to get help
about any attribute of the device. There are no limitations to this
documentation, and it is more detailed and more accurate, but the drawback is
that it requires a physical device. For example, assuming a raspberrypi-kljo
is attached:
gdm issue raspberrypi-kljo -- --help
gdm issue raspberrypi-kljo - reboot -- --help

Basic CLI usage
Let us assume you have a raspberrypi-kljo connected.
Here are a few commonly used CLI commands:

list all known devices:
gdm devices

detect new devices:
gdm detect

or
gdm detect --static_ips=10.20.30.40,50.60.70.80

Note: detection does not remove devices which are already known to GDM.

set a device property (such as an alias):
gdm set-prop raspberrypi-kljo alias rpi

check GDM version:
gdm -v

run health checks on a device:
gdm health-check raspberrypi-kljo

if you set the alias above, the following will also work:
gdm health-check rpi

run health checks, then issue a device command or retrieve a property:
gdm issue raspberrypi-kljo - reboot

issue a device command or retrieve a property without running health
checks:
gdm exec raspberrypi-kljo - reboot

use a device capability:
gdm issue raspberrypi-kljo - file_transfer - recv_file_from_device --src="/tmp/foo" --dest="/tmp/bar"

(or use gdm exec to skip health checks).

Sometimes passing the arguments to the Fire CLI gets a bit tricky. Refer to the
Python Fire documentation and
definitely review the
argument parsing section.
The most commonly used device method is shell. It runs a shell command on the
device. It is required for primary devices, but is optional for auxiliary
devices. The only auxiliary device included with GDM that implements shell()
is Raspberry Pi. If you have a Raspberry Pi connected, you can try it out:
gdm issue raspberrypi-1234 - shell "echo 'foo'"

Using the gazoo_device python package
Launch Python from a virtual environment with gazoo_device installed.
You can use the GDM CLI virtual environment:
~/gazoo/gdm/virtual_env/bin/python.
from gazoo_device import Manager
manager = Manager()
rpi = manager.create_device('raspberrypi-962c')
rpi.reboot()

Note that the device you are creating should be shown as "available" in the
output of gdm devices.
How to use GDM with test frameworks
GDM is framework-agnostic and can be used with any Python test framework.
See
examples/device_tests/README.md
for GDM + unittest and GDM + Mobly examples.
Contributor documentation
If you are interested in adding support for your device(s) to GDM, refer to
CONTRIBUTING.md.
License
Gazoo Device Manager is licensed under the
Apache 2.0 License.
Dependency license compliance
Gazoo Device Manager contains a dependency on
pyudev, which is licensed under
LGPL 2.1.
pyudev source code can be found here: https://github.com/pyudev/pyudev.
Disclaimer
This is not an official Google product.