This project aims to support both MQTT 3.x and 5, targeting C++ and Ada. It uses components from the NymphRPC Remote Procedure Call library for the networking side.

The C++ version implements the MQTT 3.x client features in 1,412 lines of code:

-------------------------------------------------------------------------------
Language                     files          blank        comment           code
-------------------------------------------------------------------------------
C++                             10            412            449            964
C/C++ Header                    12            209            141            448
-------------------------------------------------------------------------------
SUM:                            22            621            590           1412
-------------------------------------------------------------------------------

• MQTT 3.1.1 & MQTT 5 support.
• Easy integration with C++ and Ada client applications.
• Integrated MQTT broker.
• Light-weight and versatile.
• Minimal dependencies.
• Cross-platform (Windows, Linux/BSD, MacOS, etc.).
• Multi-broker (multiple active brokers per client).

C++:

Dependencies are:

• LibPOCO
• ByteBauble

Navigate to the src/ folder and run the make command there. Alternatively use either of these options:

$ make test

This will build the library and the test applications, equivalent to running make without options.

$ make lib

This will only build the library. It can be found in the 'src/lib' folder afterwards.

The project status, for each port.

• All MQTT 3.1.1 (v4) client features have been implemented.
• Connecting to multiple brokers should work.
• MQTT 3.1.1 server (broker) features are being implemented.
• MQTT 5 support is being integrated.

The Ada port at this point is being planned. Development will likely commence after the C++ port has stabilised sufficiently.

A number of unit/integration tests can be found in each port's folder, compilable using the provided Makefile.