/**

    @page shellmatta Shellmatta

    The shellmatta is a tiny shell implementation to be integrated in all kinds
    of software projects to add a debug and configuration interface.

    Please take a look at the README.md file for some information that might
    not be included here.

    @section shellmatta_api_section Shellmatta api description

    The complete api of the shellmatta is included in the file api/shellmatta.h.

    The api description can be found here:
    @subpage shellmatta_api

    This is how the classic usage looks like:

    @startuml
        App -> Shellmatta: shellmatta_doInit()

        loop for every command
            App -> Shellmatta: shellmatta_addCmd(command)
        end

        alt Authentication enabled
            App -> Shellmatta: shellmatta_auth_init()
        end

        loop until finished
            IO -> Shellmatta: shellmatta_processData(data)
            Shellmatta -> App: call command function
            App -> Shellmatta: shellmatta_printf(output data)
            Shellmatta -> IO: write(data)
        end
    @enduml


    @section shellmatta_options Shellmatta options

    The Shellmatta comes with some features which can be opted in:

    @subpage shellmatta_auth

    @subpage shellmatta_transport_layer

    @subpage shellmatta_ymodem

*/