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RIC Message Router -- RMR

RMR is a message router library which an application can use to send messages
to other RMR based applications. The destination of each message is governed
by the message type and subscription ID, or just the message type.  RMR is
responsible for establishing and managing each connection freeing the application
from any network connectivity management.

This repo contains the source and documentation for the core RMR library.
RMR python bindings are available as a submodule in the xapp-frame-py PyPI package at
https://pypi.org/project/ricxappframe/ and documented at https://docs.o-ran-sc.org/projects/o-ran-sc-ric-plt-xapp-frame-py/en/latest/.

The directories at the root level are as follows, each contains its own readme
file where additional details are necessary.


ci      This directory contains the continuous integration scripts needed
        to build and verify RMR when changes are made and committed to the repo.

doc     RMR documentation is written in a document language and thus is
        source code.  This directory contains the source for all generated
        documentation.

docs    This is a 'canned' directory which is intended to be scraped. Direct
        editing of documentation files in this directory is dangerous as
        most of the files, even though checked into the repo per mandate,
        are artifacts and will be overlaid if hand edited.

examples This directory contains example programmes which illustrate the use
        of RMR.

ext     RMR makes use of NNG (next generation Nanomsg). The ext directory is
        the git reference allowing the NNG code to be pulled and built as
        a reference.

src     This directory is the top level source directory containing the
        core RMR code.

test    All unit and application level tests for the core library are kept
        within this directory.  Tests for bindings are managed within the
        binding's directory under the source directory.

Top level pollution
There are several "configuration" files which sit at the top level of the
repo that are required for some sort of CI/CD/Documentation automation. Most,
if not all of the CI/CD goo is in the ci directory where it's out of the way
and thus not confusing. However, there is some pollution that can generally
be ignored:

    tox.ini -- this seems to drive the scraper which pulls from docs and
            writes to some external documentation repo/host.


    .readthedocs.yaml -- this seems to be some configuration for the docs
            scraping process(es).