samtecdeviceshare 2.9.1

Handles a variety of common routines for SDC-based applications

Samtec Device Connect Service

A Python 3 SDC conforming REST API to run on IoT devices that enables user discovery, viewing, and management.

Installation

pip install samtecdeviceshare

Running

First ensure all environment variables are set correctly. Note: To test locally for development ensure EMULATION and PYTHON_ENV are set.

python -m samtecdeviceshare.server

Environment Variables

A number of environment variables are supported for configuration. These configurations can also be contained in a yaml/json configuration file specified using SDC_CONFIGURATION_PATH. Env vars take precedence over the configuration file.

SDC Server / General

These variables are specific to this SDC service. The variables can also start with prefix SDC_.

Name	Description	Default
REST_ADDRESS	Rest API Address	0.0.0.0
REST_PORT	Rest port	47546
ROOT_PATH	API root path	''
PYTHON_ENV	enum: development production	production
EMULATION	Use emulated devices/io	null
LOG_VERBOSE	boolean verbose logs	false

Application

These variables are used to provide app info that will be shared by SDC.

Name	Description	Default
APP_NAME	Name of app	SDC App
APP_VERSION	SemVer of app	0.0.0
APP_WEB_PORT	Embedded web app port	80
APP_IMG_PATH	app icon path	{CURDIR}../static/img.png
APP_LOG_PATH	Path to store log files	default tempdir()
APP_LOCK_PATH	Path to update lock file	.__sdc.lock

Wireless Networks

SDC can handle configuring N wireless networks. Prefix SDC_ is required. Us integer i in prefix for defining multiple networks. A network can optionally be defined default. This will be primary method used to handle updates and will be exposed through REST API.

Name	Description	Default
SDC_WIFI[i]_SSID	WiFi SSID	null*
SDC_WIFI[i]_MODE	enum: HOTSPOT CLIENT DISABLED	DISABLED
SDC_WIFI[i]_PASS	WiFi passphrase	null
SDC_WIFI[i]_IFACE	WiFi hardware interface	null
SDC_WIFI[i]_DEFAULT	Use as default for updates	False

Wired Networks

SDC can handle configuring N wired networks. Prefix SDC_ is required. Us integer i in prefix for defining multiple networks. SDC_ETH[i]_IFACE or SDC_ETH[i]_REGEX_IFACE is required with the latter supporting regex matching. Be careful defining multiple networks with generic regular expression. Most Linux distros follow a predictable naming scheme for interfaces.. When searching for interfaces, a fullmatch is required re.fullmatch().

Name	Description	Default
SDC_ETH[i]_IFACE	Interface name (str)	null
SDC_ETH[i]_REGEX_IFACE	Interface name (regex)	null
SDC_ETH[i]_METHOD	Primary method	WiredConnectionMethod.auto
SDC_ETH[i]_TIMEOUT	Timeout of primary	15
SDC_ETH[i]_FALLBACK	Fallback method	null
SDC_ETH[i]_FALLBACK_TIMEOUT	Timeout to get DHCP address	-1

Balena

Refer to Balena documentation for list and description of variables.

• BALENA_SUPERVISOR_API_KEY
• BALENA_APP_ID
• BALENA_DEVICE_TYPE
• BALENA
• BALENA_SUPERVISOR_ADDRESS
• BALENA_SUPERVISOR_HOST
• BALENA_DEVICE_UUID
• BALENA_API_KEY
• BALENA_APP_RELEASE
• BALENA_SUPERVISOR_VERSION
• BALENA_APP_NAME
• BALENA_DEVICE_NAME_AT_INIT
• BALENA_HOST_OS_VERSION
• BALENA_SUPERVISOR_PORT

Development

Installing

git clone [e-mail]:samteccmd/samtecdeviceshare.git samtecdeviceshare
cd samtecdeviceshare
poetry install --dev
poetry shell

Testing

First, run dummy Balena supervisor:

bash ./tests/dummy-supervisor.sh

Next, fire up REST server using uvicorn:

EMULATION=1 \
PYTHON_ENV="development" \
DEBUG=1 \
uvicorn samtecdeviceshare.server:app --reload --reload-dir ./samtecdeviceshare

Interactive API docs will be available: http://127.0.0.1:8000/docs

Unit Tests

pylint --rcfile .pylintrc samtecdeviceshare
pytest