Nanopb is a plain-C implementation of Google's Protocol Buffers data format. It is targeted at 32 bit microcontrollers, but is also fit for other embedded systems with tight (<10 kB ROM, <1 kB RAM) memory constraints.
Latest stable releases
The development happens in GitHub repository (browse repository):
git clone https://github.com/nanopb/nanopb.git
Bugs can be reported on the GitHub issue tracker.
There is a discussion forum on Google Groups. Please ask any questions there.
Commercial support is available from devEmbedded.
The zlib license:
Copyright (c) 2011 Petteri Aimonen <jpa at nanopb.mail.kapsi.fi>
This software is provided 'as-is', without any express or implied warranty. In no event will the authors be held liable for any damages arising from the use of this software.
Permission is granted to anyone to use this software for any purpose, including commercial applications, and to alter it and redistribute it freely, subject to the following restrictions:
Here are a few users of nanopb who have posted public attribution notices:
There are a few other projects aiming to provide C protobuf libraries:
There is also protozero which provides a very minimalistic protobuf implementation for C++.