diff --git a/.gitignore b/.gitignore
index c7ca2f3..463b979 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,3 +1,6 @@
+_build
+*.rst
+
 # ---> Python
 # Byte-compiled / optimized / DLL files
 __pycache__/
diff --git a/.gitmodules b/.gitmodules
new file mode 100644
index 0000000..4d0363e
--- /dev/null
+++ b/.gitmodules
@@ -0,0 +1,12 @@
+[submodule "state_machine"]
+	path = state_machine
+	url = https://git.mount-mockery.de/pylib/state_machine
+[submodule "socket_protocol"]
+	path = socket_protocol
+	url = https://git.mount-mockery.de/pylib/socket_protocol
+[submodule "stringtools"]
+	path = stringtools
+	url = https://git.mount-mockery.de/pylib/stringtools
+[submodule "report"]
+	path = report
+	url = https://git.mount-mockery.de/pylib/report
diff --git a/Makefile b/Makefile
new file mode 100644
index 0000000..2a0c654
--- /dev/null
+++ b/Makefile
@@ -0,0 +1,47 @@
+# Minimal makefile for Sphinx documentation
+#
+
+# You can set these variables from the command line.
+SPHINXOPTS    =
+SPHINXBUILD   = sphinx-build
+SOURCEDIR     = .
+BUILDDIR      = _build
+MODULES       = $(sort \
+    state_machine\
+    stringtools\
+    stringtools.csp\
+    stringtools.stp\
+)
+
+# Put it first so that "make" without argument is like "make help".
+
+.PHONY: all help Makefile
+
+all: clean index.rst $(MODULES) html
+
+help:
+	@$(SPHINXBUILD) -M help "$(SOURCEDIR)" "$(BUILDDIR)" $(SPHINXOPTS) $(O)
+
+# Catch-all target: route all unknown targets to Sphinx using the new
+# "make mode" option.  $(O) is meant as a shortcut for $(SPHINXOPTS).
+html: Makefile
+	@$(SPHINXBUILD) -M $@ "$(SOURCEDIR)" "$(BUILDDIR)" $(SPHINXOPTS) $(O)
+
+clean: Makefile
+	rm -f *.rst
+	@$(SPHINXBUILD) -M $@ "$(SOURCEDIR)" "$(BUILDDIR)" $(SPHINXOPTS) $(O)
+
+index.rst: Makefile
+	@echo Generating $@
+	@echo "Indices and tables\n==================\n\n* :ref:\`genindex\`\n* :ref:\`modindex\`\n* :ref:\`search\`\n" > $@
+	@echo "Modules\n=======\n\n.. toctree::\n   :maxdepth: 2\n" >> $@
+
+%: Makefile
+	@echo "Preparing $@"
+	@echo ".. automodule:: $@\n   :members:" > $@.rst
+	@if [ "$(findstring .,$@)" != "." ]; then \
+		git -C $@ checkout master; \
+		git -C $@ pull; \
+		make -C $@/_examples_ clean all; \
+	fi
+	@echo "   $@.rst" >> index.rst; \
diff --git a/_static/.gitkeep b/_static/.gitkeep
new file mode 100644
index 0000000..e69de29
diff --git a/conf.py b/conf.py
new file mode 100644
index 0000000..8c08c7b
--- /dev/null
+++ b/conf.py
@@ -0,0 +1,179 @@
+# -*- coding: utf-8 -*-
+#
+# Configuration file for the Sphinx documentation builder.
+#
+# This file does only contain a selection of the most common options. For a
+# full list see the documentation:
+# http://www.sphinx-doc.org/en/master/config
+
+# -- Path setup --------------------------------------------------------------
+
+# If extensions (or modules to document with autodoc) are in another directory,
+# add these directories to sys.path here. If the directory is relative to the
+# documentation root, use os.path.abspath to make it absolute, like shown here.
+#
+import os
+import sys
+sys.path.insert(0, os.path.abspath('.'))
+
+
+# -- Project information -----------------------------------------------------
+
+project = 'Pylibs Documentation'
+copyright = '2021, Dirk Alders'
+author = 'Dirk Alders'
+
+# The short X.Y version
+version = ''
+# The full version, including alpha/beta/rc tags
+release = ''
+
+
+# -- General configuration ---------------------------------------------------
+
+# If your documentation needs a minimal Sphinx version, state it here.
+#
+# needs_sphinx = '1.0'
+
+# Add any Sphinx extension module names here, as strings. They can be
+# extensions coming with Sphinx (named 'sphinx.ext.*') or your custom
+# ones.
+extensions = [
+    'sphinx.ext.autodoc',
+    'sphinx.ext.coverage',
+    'sphinx_rtd_theme',
+]
+
+# Add any paths that contain templates here, relative to this directory.
+templates_path = ['_templates']
+
+# The suffix(es) of source filenames.
+# You can specify multiple suffix as a list of string:
+#
+# source_suffix = ['.rst', '.md']
+source_suffix = '.rst'
+
+# The master toctree document.
+master_doc = 'index'
+
+# The language for content autogenerated by Sphinx. Refer to documentation
+# for a list of supported languages.
+#
+# This is also used if you do content translation via gettext catalogs.
+# Usually you set "language" from the command line for these cases.
+language = None
+
+# List of patterns, relative to source directory, that match files and
+# directories to ignore when looking for source files.
+# This pattern also affects html_static_path and html_extra_path.
+exclude_patterns = ['_build', 'Thumbs.db', '.DS_Store']
+
+# The name of the Pygments (syntax highlighting) style to use.
+pygments_style = None
+
+
+# -- Options for HTML output -------------------------------------------------
+
+# The theme to use for HTML and HTML Help pages.  See the documentation for
+# a list of builtin themes.
+#
+html_theme = 'sphinx_rtd_theme'
+
+# Theme options are theme-specific and customize the look and feel of a theme
+# further.  For a list of options available for each theme, see the
+# documentation.
+#
+# html_theme_options = {}
+
+# Add any paths that contain custom static files (such as style sheets) here,
+# relative to this directory. They are copied after the builtin static files,
+# so a file named "default.css" will overwrite the builtin "default.css".
+html_static_path = ['_static']
+
+# Custom sidebar templates, must be a dictionary that maps document names
+# to template names.
+#
+# The default sidebars (for documents that don't match any pattern) are
+# defined by theme itself.  Builtin themes are using these templates by
+# default: ``['localtoc.html', 'relations.html', 'sourcelink.html',
+# 'searchbox.html']``.
+#
+# html_sidebars = {}
+
+
+# -- Options for HTMLHelp output ---------------------------------------------
+
+# Output file base name for HTML help builder.
+htmlhelp_basename = 'socket_protocoldoc'
+
+
+# -- Options for LaTeX output ------------------------------------------------
+
+latex_elements = {
+    # The paper size ('letterpaper' or 'a4paper').
+    #
+    # 'papersize': 'letterpaper',
+
+    # The font size ('10pt', '11pt' or '12pt').
+    #
+    # 'pointsize': '10pt',
+
+    # Additional stuff for the LaTeX preamble.
+    #
+    # 'preamble': '',
+
+    # Latex figure (float) alignment
+    #
+    # 'figure_align': 'htbp',
+}
+
+# Grouping the document tree into LaTeX files. List of tuples
+# (source start file, target name, title,
+#  author, documentclass [howto, manual, or own class]).
+latex_documents = [
+    (master_doc, 'socket_protocol.tex', 'socket\\_protocol Documentation',
+     'Dirk Alders', 'manual'),
+]
+
+
+# -- Options for manual page output ------------------------------------------
+
+# One entry per manual page. List of tuples
+# (source start file, name, description, authors, manual section).
+man_pages = [
+    (master_doc, 'socket_protocol', 'socket_protocol Documentation',
+     [author], 1)
+]
+
+
+# -- Options for Texinfo output ----------------------------------------------
+
+# Grouping the document tree into Texinfo files. List of tuples
+# (source start file, target name, title, author,
+#  dir menu entry, description, category)
+texinfo_documents = [
+    (master_doc, 'socket_protocol', 'socket_protocol Documentation',
+     author, 'socket_protocol', 'One line description of project.',
+     'Miscellaneous'),
+]
+
+
+# -- Options for Epub output -------------------------------------------------
+
+# Bibliographic Dublin Core info.
+epub_title = project
+
+# The unique identifier of the text. This can be a ISBN number
+# or the project homepage.
+#
+# epub_identifier = ''
+
+# A unique identification for the text.
+#
+# epub_uid = ''
+
+# A list of files that should not be packed into the epub file.
+epub_exclude_files = ['search.html']
+
+
+# -- Extension configuration -------------------------------------------------
diff --git a/report b/report
new file mode 160000
index 0000000..25889f2
--- /dev/null
+++ b/report
@@ -0,0 +1 @@
+Subproject commit 25889f225b3593d515e37bebffef21458c961f64
diff --git a/socket_protocol b/socket_protocol
new file mode 160000
index 0000000..eff44b7
--- /dev/null
+++ b/socket_protocol
@@ -0,0 +1 @@
+Subproject commit eff44b7988cbdaf87865010b5b8919dc0d6f31db
diff --git a/state_machine b/state_machine
new file mode 160000
index 0000000..2bd8162
--- /dev/null
+++ b/state_machine
@@ -0,0 +1 @@
+Subproject commit 2bd816297527e77fb44a03ddf4aca35124f6f303
diff --git a/stringtools b/stringtools
new file mode 160000
index 0000000..f545386
--- /dev/null
+++ b/stringtools
@@ -0,0 +1 @@
+Subproject commit f5453861f646873b1800e657faa9e4b8684c21ba