Fitterbap python bindings

fitterbap, pubsub, uart
pip install pyfitterbap==0.4.1




Welcome to Fitterbap, the Firmware toolkit to enable reliable best architecture practices! Fitterbap provides common utilities useful for embedded systems that are often not included in an RTOS or the standard C library. Fitterbap includes:

  • A distributed publish-subscribe implementation for easy command, control, and configuration of your designs.
  • A high-reliability data link protocol, suitable for UARTs.
  • Common C macros, including assert and design-by-contract.
  • Host software and UI to accelerate firmware development.
  • And more!

This library is intended for use by software developers producing firmware for embedded devices based upon microcontrollers. Many features of the library use malloc, but it avoids using free. The Fitterbap library is available under the permissive Apache 2.0 license.

As of June 2021, the Fitterbap library API is not yet stable and subject to change without notice.

Getting started

The easiest way to get started is to check out the fitterbap_example_stm32g4. If you want to try distributed PubSub and the comm stack, you can buy the STMicroelectronics Nucleo-G491RE development board. When you first connect the Nucleo board over USB, it shows up as a mass storage device. You can simply copy over the release binaries and start the host UI, which looks like this:

Fitterbap Host Comm UI

Known limitations

  • Comm
    • No native USB reference implementation yet, but can use USB-CDC.
  • PubSub
    • Hard-coded maximum topic lengths.
    • No validation using provided topic metadata.
  • Host
    • Win 10x64 only, no macOS or Linux yet.
    • fbp_fatal not properly implemented for pyfitterbap.


The Fitterbap library uses CMake to generate the project make files for the C components.

Since Fitterbap is a library primarily targeted at embedded microcontrollers, you will likely want to include compile it into your project. Projects using CMake can use ExternalProject_Add. Other build systems will likely need to include the source files directly. Consider using git subtrees or git submodules.

You will need to manually create the fitterbap/config.h file and implement the platform abstraction layer. See fitterbap/platform.h for details.

Host python

Install 64-bit python 3.8 or newer on your system. Confirm that it is correctly installed:

python3 -VV

On Windows, python 3 is usually installed as python rather than python3.

Then install the pyfitterbap package from pypi:

pip install -U pyfitterbap

You can then run the pyfitterbap communication UI tools using either:

python3 -m pyfitterbap comm_ui


fitterbap comm_ui


First install the build tools for your system.

sudo apt-get install build-essential cmake doxygen graphviz git

Then compile the Fitterbap library:

mkdir build && cd $_
cmake ..
cmake --build .
ctest .

You can also build and test the python library:

python3 build_ext --inplace
python3 -m unittest

To run the host comm UI:

python3 -m pyfitterbap comm_ui


The Fitterbap library is available under the permissive Apache 2.0 license. This library includes all third-party dependencies in the third-party directory. The dependencies are built along with this project.
These third-party libraries are provided under their own licenses.

More information

The Fitterbap API is documented using doxygen.

For a history of changes, see the changelog.


Fitterbap is a broad library that implements several distinct features. Here are some other libraries that you can consider.

Full system:

Communication protocols:


Command & control:

Random number generation: