stapy

This is an easy to use SensorThings API Client written in Python

Important

This project is no longer being actively maintained. Since the STA standard keeps evolving, the feature set of this client implementation will keep falling behind. However the project Frost-Python-Client is actively maintained and provides a seemingly complete API.

The SensorThings API (STA) is an OGC standard for IoT device sensing data.
A server implementation of the STA can be found here FROST.
For more (advanced) information about the SensorThings API see the official OGC documentation.

Installation

stapy is compatible with Python 3.7+ and the recommended way to install is via pip

pip install stapy

Usage

stapy can be used both form the command line (in two different ways) and as a Python library.

STA_URL

At first it is necessary to set the URL of the STA. Optionally it is also possible to set credentials for a basic authentication. Within the CLI this can be achieved as follows:

stapy -u {URL}
stapy -c {USR} {PWD}

stapy can of course be also run as a Python module(python -m stapy)

The URL and credentials can also be set from within a Python script:

>>> import stapy

>>> stapy.set_sta_url({URL})
>>> stapy.set_credentials({USR}, {PWD})

CLI - Interactive

The interactive mode is the easiest one to use but can not be used programmatically. Therefore it is probably a good starting point to get familiar with the STA. The interactive mode can be invoked in the following way.

stapy -i

Currently it does support POST, PATCH and DELETE requests.

CLI - Normal

The normal command line mode is a bit more difficult to use but can be automated.

stapy --help

Should give sufficient information on how two use it properly. As the interactive mode it does support POST, PATCH and DELETE requests.

Library

This is the Python interface to the SensorThings API (stapy is meant to be used as Python library). Therefore it supports all requests (POST, PATCH, DELETE and GET).

The relevant classes can be found within the files entity.py, delete.py, post.py, patch.py and query.py in the sta sub-module.

The following syntax can be used to create new entities:

>>> from stapy import Post

>>> Post.observed_property("TestProp", "TestProp-Desc", "TestProp-Def")

To understand which arguments are available and mandatory it is advisable to have a look at the STA-Docs and/or use the interactive mode of stapy.

Following is one example of a GET request:

>>> from stapy import Query, Entity

>>> results, times = Query(Entity.Observation).select("result", "phenomenonTime").order("result").get_data_sets()

results afterwards contains all results of the present Observations in ascending order.
times contains the respective times for the results.

stapy does support all GET query options that are available for the STA. Some examples are select, filter, orderby and skip. These can be chained together as seen in the example above.

Further use-cases and applications can be found in the examples.

Development

To build this project, run python setup.py build. To execute the unit tests, run python setup.py test.