Opendnp3 is a portable, scalable, and rigorously tested implementation of the DNP3 (www.dnp.org) protocol stack written in C++11. The library is designed for high-performance applications like many concurrent TCP sessions or huge device simulations. It also embeds very nicely on Linux.
The documentation can be found on the project homepage.
If you want to help contribute to the official guide its in this repo.
Licensed under the terms of the Apache 2.0 License.
Copyright (c) 2010, 2011 Green Energy Corp
Copyright (c) 2013 - 2015 Automatak LLC
Copyright (c) 2010 - 2015 various contributors