PyPI page https://pypi.org/project/dnp3protocol/

install using - pip install dnp3protocol

DNP3 Distributed Network Protocol 3 is a set of communications protocols used between components in process automation systems. Its main use is in utilities such as electric and water companies.
Usage in other industries is not common. It was developed for communications between various types of data acquisition and control equipment. It plays a crucial role in SCADA systems, where it is used by SCADA Master Stations (a.k.a. Control Centers), Remote Terminal Units (RTUs), and Intelligent Electronic Devices (IEDs).
It is primarily used for communications between a master station and RTUs or IEDs.

- quote from Wikipedia page on DNP3

Salient Features

Transparent licensing scheme - No hidden costs, No deferred payments.
High performance, robust and scalable architecture
Provides a simple method for systems integrators and OEMs to utilize standard tools to implement their systems
For Linux Platform, Protocol Stack written using only POSIX-compliant system calls and libraries.
Context-based event-driven model
Supports Serial, TCP IP Communication
Level 3 Compliance
Supports File Transfer ( File read, file write), Directory commands.
Supports unsolicited response, Octect String, Virtual Terminal Output
Supports "Select-Before-Operate" and "Direct-Execute" command execution modes
Support Binary Output(CROB) and Analog Output Commands, Clock time synchronization
device attributes support
support C, C++, C# languages
Supports, frozen counter input, frozen analog input Groups
Our stacks are fully compliant with "POSIX" and tested in ubuntu, feroda, Debian, QNX, Linux Embedded OS and Various Cross compiler tool chains.
Multiple Server and Client Simulation
Source Code Library allows a fast and cost efficient implementation
APIs are designed to be very easy to use and flexible

Get a free DNP3 Development Bundle

New updated Version of DNP3 Simulator & SDK (Software Development Kit) is available now.
FreyrSCADA DNP3 Development Bundle
In the Development Bundle, We included DNP3 Server & Client Simulator, Windows & Linux SDK.