Description

A fully functional, API-first implementation of core software for control and use of the Decent Espresso DE1.

It provides core components, which can be run as an unattended service that automatically starts at boot, to supply stable, versioned APIs to provide all primary functions of use of a DE1 and data collection around it.

A web app has been able to demonstrate sufficiency of the APIs and functionality for the majority of day-to-day operations, including real-time graphing and history display. A running example is available, linked from DecentForum.com. It uses the supplied, stand-alone “replay” application to play back a shot in real time. This tool is also useful for development of companion applications.

Profiles and real-time data are captured into a SQLite3 database that allows multiple, concurrent access.

A stand-alone program is provided that can automatically upload “shots” to Visualizer as soon as they complete. It can also notify consumers of the URL returned.

An example program is provided that generates legacy-style, “shot files” that are compatible with Visualizer and John Weiss’ shot-plotting programs.

The APIs are under semantic versioning. The REST-like, HTTP-transport versions can be retrieved from version at the document root, and also include the Python and package versions installed. Each of the JSON-formatted, MQTT packets contains a version key:value for that payload.

Consumers of these APIs should only need to understand high-level actions, such as “Here is a profile blob, please load it.” The operations and choice of connectivity to the devices is “hidden” behind the APIs.

Documentation and Source

Documentation is available at https://pyde1.readthedocs.io/en/latest/

Source code is available at https://github.com/jeffsf/pyDE1.git

Requirements

Python 3.8 or later.

Current plans are to continue to support two versions prior to the latest Python version. PEP 664 shows a schedule of October, 2022 for Python 3.11.0 release. Users should plan on moving to at least Python 3.9 prior to that release. Python 3.9 is “standard” with the Debian Bullseye distro, as well as the current, Raspberry Pi OS release.

Available through pip and installed as dependencies:

• aiosqlite

• bleak

• paho-mqtt

• PyYAML

• requests

An MQTT broker compatible with MQTT 5 clients, such as mosquitto 2.0

A production-quality web server, such as nginx is highly recommended operating as a reverse proxy, rather than directly exposing the Python web server.

Status — Release

This code is used on a daily basis for operation of the author’s DE1.

License

Copyright © 2021, 2022 Jeff Kletsky. All Rights Reserved.

License for this software, part of the pyDE1 package, is granted under

GNU General Public License v3.0 only

SPDX-License-Identifier: GPL-3.0-only