Refactor of the documentation

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diff --git a/doc/FAQ.md b/doc/FAQ.md
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-Frequently Asked Question about AFB-DAEMON
-==========================================
-
-
-
diff --git a/doc/afb-application-writing.md b/doc/afb-application-writing.md
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-How to write an application on top of AGL FRAMEWORK
-====================================================
-
-Programming Languages for Applications
------------------------------------------
-
-### Writing an HTML5 application
-
-Developers of HTML5 applications (client side) can easily create
-applications for AGL framework using their preferred
-HTML5 framework.
-
-Developers may also take advantage of powerful server side bindings to improve
-application behavior. Server side bindings return an application/json mine-type
-and can be accessed though either HTTP or Websockets.
-
-In a near future, JSON-RPC protocol should be added to complete the current
-x-afb-json1 protocol.
-
-Two examples of HTML5 applications are given:
-
-- [afb-client](https://gerrit.automotivelinux.org/gerrit/gitweb?p=src/app-framework-demo.git;a=tree;f=afb-client) a simple "hello world" application template
-
-- [afm-client](https://gerrit.automotivelinux.org/gerrit/gitweb?p=src/app-framework-demo.git;a=tree;f=afm-client) a simple "Home screen" application template
-
-### Writing a Qt application
-
-Writing Qt applications is also supported. Qt offers standard API to send
-request through HTTP or WebSockets.
-
-It is also possible to write QML applications. A sample QML application
-[token-websock] is available:
-
-- [token-websock](https://gerrit.automotivelinux.org/gerrit/gitweb?p=src/app-framework-binder.git;a=blob;f=test/token-websock.qml)
-a simple "hello world" application in QML
-
-### Writing a "C" application
-
-C applications can use afb-daemon binder through a websocket connection.
-
-The library **libafbwsc** is provided for C clients that need
-to connect with an afb-daemon binder.
-
-The program **afb-client-demo** is the C example that use
-**libafbwsc** library.
-Source code is available here
-[src/afb-client-demo.c](https://gerrit.automotivelinux.org/gerrit/gitweb?p=src/app-framework-binder.git;a=blob;f=src/afb-client-demo.c).
-
-Current implementation relies on libsystemd and file descriptors.
-This model might be review in the future to support secure sockets
-and get rid of libsystemd dependency.
-
-Handling sessions within applications
--------------------------------------
-
-Applications should understand sessions and token management when interacting
-with afb-daemon binder.
-
-Applications communicate with their private binder(afb-daemon) using
-a network connection or potentially any other connection channel. While the
-current version does not yet implement Unix socket, this feature might be added
-in the near future. Developers need to be warn that HTTP protocol is a none
-connected protocol and that using HTTP socket connection to authenticate
-clients is not supported.
-
-For this reason, the binder should authenticate the application
-by using a shared secret. The secret is named "token" and the identification
-of client is named "session".
-
-The examples **token-websock.qml** and **afb-client** are demonstrating
-how authentication and sessions are managed.
-
-### Handling sessions
-
-Bindings and other binder features need to keep track of client
-instances. This is especially important for bindings running as services
-as they may typically have to keep each client's data separated.
-
-For HTML5 applications, the web runtime handles the cookie of session
-that the binder afb-daemon automatically sets.
-
-Session identifier can be set using the parameter **uuid** or **x-afb-uuid** in
-URI requests. Within current version of the framework session UUID is supported
-by both HTTP requests and websocket negotiation.
-
-### Exchanging tokens
-
-At application start, AGL framework communicates a shared secret to both binder
-and client application. This initial secret is called the "**initial token**".
-
-For each of its client application, the binder manages a current active
-token for session management. This authentication token can be use to restrict
-the access to some binding's methods.
-
-The token must be included in URI request on HTTP or during websockets
-connection using parameter **token** or **x-afb-token**.
-
-To ensure security, tokens must be refreshed periodically.
-
-### Example of session management
-
-In following examples, we suppose that **afb-daemon** is launched with something
-equivalent to:
-
-    $ afb-daemon --port=1234 --token=123456 [...]
-
-making the expectation that **AuthLogin** binding is requested as default.
-
-#### Using curl
-
-First, connects with the initial token, 123456:
-
-    $ curl http://localhost:1234/api/auth/connect?token=123456
-    {
-      "jtype": "afb-reply",
-      "request": {
-         "status": "success",
-         "token": "0aef6841-2ddd-436d-b961-ae78da3b5c5f",
-         "uuid": "850c4594-1be1-4e9b-9fcc-38cc3e6ff015"
-      },
-      "response": {"token": "A New Token and Session Context Was Created"}
-    }
-
-It returns an answer containing session UUID, 850c4594-1be1-4e9b-9fcc-38cc3e6ff015,
-and a refreshed token, 850c4594-1be1-4e9b-9fcc-38cc3e6ff015.
-
-Check if session and token is valid:
-
-    $ curl http://localhost:1234/api/auth/check?token=0aef6841-2ddd-436d-b961-ae78da3b5c5f\&uuid=850c4594-1be1-4e9b-9fcc-38cc3e6ff015
-    {
-      "jtype": "afb-reply",
-      "request": {"status":"success"},
-      "response": {"isvalid":true}
-    }
-
-Refresh the token:
-
-    $ curl http://localhost:1234/api/auth/refresh?token=0aef6841-2ddd-436d-b961-ae78da3b5c5f\&uuid=850c4594-1be1-4e9b-9fcc-38cc3e6ff015
-    {
-      "jtype": "afb-reply",
-      "request": {
-         "status":"success",
-         "token":"b8ec3ec3-6ffe-448c-9a6c-efda69ad7bd9"
-      },
-      "response": {"token":"Token was refreshed"}
-    }
-
-Close the session:
-
-    curl http://localhost:1234/api/auth/logout?token=b8ec3ec3-6ffe-448c-9a6c-efda69ad7bd9\&uuid=850c4594-1be1-4e9b-9fcc-38cc3e6ff015
-    {
-      "jtype": "afb-reply",
-      "request": {"status": "success"},
-      "response": {"info":"Token and all resources are released"}
-    }
-
-Checking on closed session for uuid should be refused:
-
-    curl http://localhost:1234/api/auth/check?token=b8ec3ec3-6ffe-448c-9a6c-efda69ad7bd9\&uuid=850c4594-1be1-4e9b-9fcc-38cc3e6ff015
-    {
-      "jtype": "afb-reply",
-      "request": {
-         "status": "failed",
-         "info": "invalid token's identity"
-      }
-    }
-
-#### Using afb-client-demo
-
-> The program is packaged within AGL in the rpm **libafbwsc-dev**
-
-Here is an example of exchange using **afb-client-demo**:
-
-    $ afb-client-demo ws://localhost:1234/api?token=123456
-    auth connect
-    ON-REPLY 1:auth/connect: {"jtype":"afb-reply","request":{"status":"success",
-       "token":"63f71a29-8b52-4f9b-829f-b3028ba46b68","uuid":"5fcc3f3d-4b84-4fc7-ba66-2d8bd34ae7d1"},
-       "response":{"token":"A New Token and Session Context Was Created"}}
-    auth check
-    ON-REPLY 2:auth/check: {"jtype":"afb-reply","request":{"status":"success"},"response":{"isvalid":true}}
-    auth refresh
-    ON-REPLY 4:auth/refresh: {"jtype":"afb-reply","request":{"status":"success",
-       "token":"8b8ba8f4-1b0c-48fa-962d-4a00a8c9157e"},"response":{"token":"Token was refreshed"}}
-    auth check
-    ON-REPLY 5:auth/check: {"jtype":"afb-reply","request":{"status":"success"},"response":{"isvalid":true}}
-    auth refresh
-    ON-REPLY 6:auth/refresh: {"jtype":"afb-reply","request":{"status":"success",
-       "token":"e83b36f8-d945-463d-b983-5d8ed73ba529"},"response":{"token":"Token was refreshed"}}
-
-After closing connection, reconnect as here after:
-
-    $ afb-client-demo ws://localhost:1234/api?token=e83b36f8-d945-463d-b983-5d8ed73ba529\&uuid=5fcc3f3d-4b84-4fc7-ba66-2d8bd34ae7d1 auth check
-    ON-REPLY 1:auth/check: {"jtype":"afb-reply","request":{"status":"success"},"response":{"isvalid":true}}
-
-Same connection check using **curl**:
-
-    $ curl http://localhost:1234/api/auth/check?token=e83b36f8-d945-463d-b983-5d8ed73ba529\&uuid=5fcc3f3d-4b84-4fc7-ba66-2d8bd34ae7d1
-    {"jtype":"afb-reply","request":{"status":"success"},"response":{"isvalid":true}}
-
-Format of replies
------------------
-
-Replies use javascript object returned as serialized JSON.
-
-This object contains at least 2 mandatory fields of name **jtype** and
-**request** and one optional field of name **response**.
-
-### Template
-
-This is a template of replies:
-
-```json
-{
-   "jtype": "afb-reply",
-   "request": {
-      "status": "success",
-      "info": "informationnal text",
-      "token": "e83b36f8-d945-463d-b983-5d8ed73ba52",
-      "uuid": "5fcc3f3d-4b84-4fc7-ba66-2d8bd34ae7d1",
-      "reqid": "application-generated-id-23456"
-   },
-   "response": ....any response object....
-}
-```
-
-### Field jtype
-
-The field **jtype** must have a value of type string equal to **"afb-reply"**.
-
-### Field request
-
-The field **request** must have a value of type object. This request object
-has at least one field named **status** and four optional fields named
-**info**, **token**, **uuid**, **reqid**.
-
-#### Subfield request.status
-
-**status** must have a value of type string. This string is equal to **"success"**
-only in case of success.
-
-#### Subfield request.info
-
-**info** is of type string and represent optional information added to the reply.
-
-#### Subfield request.token
-
-**token** is of type string. It is sent either at session creation 
-or when the token is refreshed.
-
-#### Subfield request.uuid
-
-**uuid** is of type string. It is sent at session creation.
-
-#### Subfield request.reqid
-
-**reqid** is of type string. It is sent in response to HTTP requests
-that added a parameter of name **reqid** or **x-afb-reqid** at request time.
-Value returns in the reply has the exact same value as the one received in the
-request.
-
-### Field response
-
-This field response optionally contains an object returned when request
-succeeded.
-
-Format of events
-----------------
-
-Events are javascript object serialized as JSON.
-
-This object contains at least 2 mandatory fields of name **jtype** and **event**
-and one optional field of name **data**.
-
-### Template
-
-Here is a template of event:
-
-```json
-{
-   "jtype": "afb-event",
-   "event": "sample_api_name/sample_event_name",
-   "data": ...any event data...
-}
-```
-
-### Field jtype
-
-The field **jtype** must have a value of type string equal to **"afb-event"**.
-
-### Field event
-
-The field **event** carries the event's name.
-
-The name of the event is made of two parts separated by a slash:
-the name of the name of the API that generated the event
-and the name of event within the API.
-
-### Field data
-
-This field data if present holds the data carried by the event.
-
diff --git a/doc/afb-bindings-overview.md b/doc/afb-bindings-overview.md
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-
-Overview of bindings shipped with AFB-Daemon
-===========================================
-
-List of bindings
----------------
-
-Here are the bindings shipped in the source tree:
-
-* Hello World
-* Authentication
-* Tic Tac Toe
-* Audio _(2 backends: ALSA/PulseAudio)_
-* Radio _(1 backend: RTLSDR RTL2832U)_
-* Media _(1 backend: Rygel UPnP)_
-
-All bindings may not be built, depending on the development libraries present on
-the system at build time.
-
-
-Detail of bindings
------------------
-
-### Hello World
-
-A sample Hello World binding for demonstration and learning purposes.
-
-This binding provides a few unauthenticated requests, all beginning with
-"ping", to demonstrate basic binder capabilities.
-
-**Verbs**:
-
-* _ping:_ returns a success response
-* _pingfail:_ returns a failure response
-* _pingnull:_ returns a success response, with an empty JSON response field
-* _pingbug:_ does a memory violation (intercepted by the binder)
-* _pingJson:_ returns a success response, with a complex JSON response field
-* _pingevent:_ broadcasts a global event
-
-<br />
-
-
-### Authentication
-
-A sample Authentication binding for demonstration purposes.
-
-This binding provides a few requests to demonstrate the binder's token-based
-security mechanism.
-
-Calling "_connect_" with a security token will initiate a session, calling
-"_refresh_" will issue a new token and invalidate the previous one, calling
-"_logout_" will invalidate all tokens and close the session.
-
-**Verbs**:
-
-* _ping:_ returns a success response
-* _connect:_ creates a session and returns a new token
-* _refresh:_ returns a new token
-* _check:_ verifies the passed token is valid
-* _logout:_ closes the session
-
-<br />
-
-
-### Tic Tac Toe
-
-A sample Tic Tac Toe game binding.
-
-This binding provides an interactive Tic Tac Toe game where the binder returns
-the grid as a JSON response. 
-
-**Verbs**:
-
-* _new:_ starts a new game
-* _play:_ asks the server to play
-* _move:_ gives a client move
-* _board:_ gets the current board state, as a JSON structure
-* _level_: sets the server level
-* _join_: joins an existing board
-* _undo_: undo the last move
-* _wait_: wait for a move
-
-<br />
-
-
-### Audio
-
-A sample Audio binding with 2 backends:
-
-* ALSA (mandatory)
-* PulseAudio (optional)
-
-This binding is able to initialize a specific soundcard, define volume levels,
-channels (mono/stereo...), mute sound, and play a 22,050 Hz PCM stream.
-
-**Verbs**:
-
-* _ping:_ returns a success response
-* _init:_ initializes backend, on the "default" sound card
-* _volume:_ gets or sets volume, in % (0-100)
-* _channels:_ gets or sets channels count (1-8)
-* _mute:_ gets or sets the mute status (on-off)
-* _play_: gets or sets the playing status (on-off)
-
-_(if PulseAudio development libraries are not found at build time, only ALSA
-will be available)_
-
-_(if a PulseAudio server is not found at runtime, the binding will dynamically
-fall back to ALSA)_
-
-_(a specifc backend can be forced by using this syntax before running afb-daemon
-: **$ export AFB_AUDIO_OUTPUT=Alsa**)_
-
-<br />
-
-
-### Radio
-
-A sample AM/FM Radio binding with 1 backend:
-
-* RTLSDR - Realtek RTL2832U dongles (mandatory)
-
-This binding is able to initialize specific RTL2832U dongles, switch between
-AM/FM modes, define frequency, mute sound, and play sound (if combining with
-the **audio** binding).
-
-**Verbs**:
-
-* _ping:_ returns a success response
-* _init:_ initializes backend, looking for plugged-in devices
-* _power:_ sets device power status (on-off)
-* _mode:_ sets device reception mode (AM-FM)
-* _freq:_ sets device frequency (in Hz)
-* _mute_: sets device mute status (on-off)
-* _play_: sets device playing status (on-off)
-
-_(if rtlsdr development libraries are not found at build time, this binding will
-not be built)_
-
-<br />
-
-### Media
-
-A sample Media Server binding with 1 backend:
-
- * Rygel
-
-This binding is able to detect a local Rygel UPnP media server, list audio
-files, select an audio file for playback, play/pause/seek in this file, upload
-an audio file to the server.
-
-**Verbs**:
-
-* _ping:_ returns a success response
-* _init:_ initializes backend, looking for an active local UPnP server
-* _list:_ returns list of audio files, as a JSON structure
-* _select:_ select an audio files, by index number (001-...)
-* _play:_ plays the currently selected audio file
-* _stop:_ stops the currently selected audio file
-* _pause:_ pauses the currently selected audio file
-* _seek:_ seeks in the currently selected audio file, in seconds
-* _upload:_ uploads an audio file, with a POST request
-
-_(if GUPnP/GSSDP development libraries are not found at build time, this binding
-will not be built)_
-
-<br />
-
-
----
-<br />
-
-Sample command-line applications: _afb-client-demo_ (built by default)
-
-Sample HTML5 applications: 
-**test/*.html**, 
-**[afb-client](https://gerrit.automotivelinux.org/gerrit/gitweb?p=src/app-framework-demo.git;a=tree)**, 
-**[afb-radio](https://github.com/iotbzh/afb-radio)**
-
-Sample Qt/QML applications: *test/token-websock.qml*
diff --git a/doc/afb-bindings-writing.md b/doc/afb-bindings-writing.md
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-
-How to write a binding for AFB-DAEMON
-===================================
-
-Summary
--------
-
-The afb-daemon binders serve files through HTTP protocol and offers to
-developers the capability to offer application API methods through HTTP or
-WebSocket protocol.
-
-The bindings are used to add API to ***afb-daemon***.
-This part describes how to write a binding for***afb-daemon***.
-
-Excepting this summary, this document target developers.
-
-Before moving further through an example, here after
-a short overview of binder bindings fundamentals.
-
-### Nature of a binding
-
-A binding is an independent piece of software. A binding is self contain and
-exposes application logic as sharable library. A binding is intended to be
-dynamically loaded by ***afb-daemon*** to expose application API.
-
-Technically, a binder binding does not reference and is not linked with any
-***afb-daemon*** library.
-
-### Class of bindings
-
-Application binder supports two kinds of bindings: application bindings and
-service bindings. Technically both class of binding are equivalent and use the
-same coding convention. Only sharing mode and security context diverge.
-
-#### Application-bindings
-
-Application-bindings implements the glue in between application's UI and
-services. Every AGL application has a corresponding binder that typically
-activates one or many bindings to interface the application logic with lower
-platform services. When an application is started by the AGL application
-framework, a dedicate binder is started that loads/activates application
-binding(s). API expose by application-binding are executed within corresponding
-application security context.
-
-Application bindings generally handle a unique context for a unique client. As
-the application framework start a dedicated instance of afb_daemon for each AGL
-application, if a given binding is used within multiple application each of
-those application get a new and private instance of eventually "shared" binding.
-
-#### Service-bindings
-
-Service-bindings enable API activation within corresponding service security
-context and not within calling application context. Service-bindings are
-intended to run as a unique instance. Service-bindings can be shared in between
-multiple clients.
-
-Service-bindings can either be stateless or manage client context. When managing
-context each client get a private context. Sharing may either be global to the
-platform (ie: GPS service) or dedicated to a given user (ie: user preferences)
-
-### Live cycle of bindings within ***afb-daemon***
-
-Application and service bindings are loaded and activated each time a new
-***afb-daemon*** is started.
-
-At launch time, every loaded binding initialise itself. If a single binding
-initialisation fails the corresponding instance of ***afb-daemon*** aborts.
-
-Conversely, when a binding initialisation succeeds, it should register its
-unique name as well as the list of verbs (methods name from binder point of
-view) attached to the methods it exposes.
-
-When initialised, on request from application clients to the right API/verbs
-binding methods are activated by the ***afb-daemon*** attached to the
-application or service.
-
-At exit time, no special action is enforced by ***afb-daemon***. When a specific
-actions is required at afb-daemon stop, developers should use 'atexit/on_exit'
-during binding initialisation sequence to register a custom exit function.
-
-### Binding Content
-
-Afb-daemon's bindings register two classes of objects: names and functions.
-
-Bindings declare categories of names:
- - A unique binding name to access all API exposed by this binding,
- - One name for each methods/verbs provided by this binding.
-
-Bindings declare two categories of functions:
- - function used for initialisation
- - functions implementing the exposed API methods
-
-Afb-daemon parses URI requests to extract the API(binding name) and the
-VERB(method to activate). As an example, URI **foo/bar** translates to binding
-named **foo** and method named **bar**. To serve such a request,
-***afb-daemon*** looks for an active binding named **foo** and then within this
-binding for a method named **bar**. When found ***afb-daemon*** calls
-the corresponding method with an attached parameter if any.
-
-Afb-daemon is case-insensitive when parsing URI. Thus **TicTacToe/Board** and
-**tictactoe/board** are equivalent.
-
-#### The name of the binding
-
-The name of a given binding is also known as the name
-of the API prefix that defines the binding.
-
-The name of a binding SHOULD be unique within a given ***afb-daemon*** instance.
-
-For example, when a client of ***afb-daemon*** calls a URI named **foo/bar**.
-Afb-daemon extracts the prefix **foo** and the suffix **bar**. **foo** must
-match a binding name and **bar** has to match a VERB attached to some method.
-
-#### Names of methods
-
-Each binding exposes a set of methods that can be called by the clients of a
-given ***afb-daemon***.
-
-VERB's name attached to a given binding (API) MUST be unique within a binding.
-
-Bindings static declaration link VERBS to the corresponding methods.
-When clients emit requests on a given API/VERB corresponding method is called
-by ***afb-daemon***.
-
-#### Initialisation function
-
-Binding's initialisation function serves several purposes.
-
-1. It allows ***afb-daemon*** to control the binding version depending on
-the initialisation of function name. As today, the only supported initialisation
-function is **afbBindingV1Register**. This identifies version "one" of bindings.
-
-2. It allows bindings to initialise itself.
-
-3. It enables names declarations: descriptions, requirements and implementations
-of exposed API/VERB.
-
-#### Functions instantiation of API/VERBs
-
-When an API/VERB is called, ***afb-daemon*** constructs a request object. Then
-it passes this request object to the implementation function corresponding to
-requested method, this within attached API binding.
-
-An implementation function receives a request object used to: get
-the arguments of the request, send an answer, store session data.
-
-A binding MUST set an answer to every received requests.
-
-Nevertheless, there are two implementations, *synchronous* and *asynchronous*.
-API/VERB implementation that set an answer before returning are called
-*synchronous implementations*. Those that do not systematically set an answer
-before returning are called *asynchronous implementations*.
-
-Asynchronous implementations typically launch asynchronous actions. They record
-some context at request time and provide an answer to the request only at
-completion of asynchronous actions.
-
-The Tic-Tac-Toe example
------------------------
-
-This part explains how to write an afb-binding. For the sake of being practical
-it uses many examples based on tic-tac-toe. This binding example is in
-*bindings/samples/tic-tac-toe.c*.
-
-This binding is named ***tictactoe***.
-
-Dependencies when compiling
----------------------------
-
-Afb-daemon provides a configuration file for *pkg-config*.
-Typing the command
-
-	pkg-config --cflags afb-daemon
-
-Print flags use for compilation:
-
-	$ pkg-config --cflags afb-daemon
-	-I/opt/local/include -I/usr/include/json-c
-
-For linking, you should use
-
-	$ pkg-config --libs afb-daemon
-	-ljson-c
-
-Afb-daemon automatically includes the dependency to json-c.
-This is activated through **Requires** keyword in pkg-config.
-While almost every binding replies on **json-c** this is not a must have
-dependency.
-
-Internally, ***afb-daemon*** relies on **libsystemd** for its event loop, as
-well as for its binding to D-Bus. Bindings developers are encouraged to leverage
-**libsystemd** when possible. Nevertheless there is no hard dependency to
-**libsystemd** if you do not want to use it, feel free to do so.
-
-> Afb-daemon bindings are fully self contained. They do not enforce dependency
-on any libraries from the application framework.
-> Afb-daemon dependencies requirer to run AGL bindings are given at runtime
-through pointers leveraging read-only
-> memory feature.
-
-Header files to include
------------------------
-
-Binding *tictactoe* has following includes:
-
-```C
-#define _GNU_SOURCE
-#include <stdio.h>
-#include <string.h>
-#include <json-c/json.h>
-#include <afb/afb-binding.h>
-```
-
-Header *afb/afb-binding.h* is the only hard dependency, it includes all features
-that a binding MUST HAVE. Outside of includes used to support application logic,
-common external headers used within bindings are:
-
-- *json-c/json.h*: should be include to handle json objects;
-- *systemd/sd-event.h*: should be include to access event main loop;
-- *systemd/sd-bus.h*: should be include for dbus connections.
-
-The *tictactoe* binding does not leverage systemd features, also only json.h
-is used on top of mandatory afb/afb-binding.h.
-
-When including *afb/afb-binding.h*, the macro **_GNU_SOURCE** MUST be
-defined.
-
-Choosing names
---------------
-
-Designers of bindings should define a unique name for every API binding
-as well as for methods VERBs. They should also define names for request
-arguments passed as name/value pair in URI.
-
-While forging names, designers should respect few rules to
-ensure that created names are valid and easy to use across platforms.
-
-All names and strings are UTF-8 encoded.
-
-### Names for API (binding)
-
-Binding API name are checked.
-All characters are authorised except:
-
-- the control characters (\u0000 .. \u001f)
-- the characters of the set { ' ', '"', '#', '%', '&',
-  '\'', '/', '?', '`', '\x7f' }
-
-In other words the set of forbidden characters is
-{ \u0000..\u0020, \u0022, \u0023, \u0025..\u0027,
-  \u002f, \u003f, \u0060, \u007f }.
-
-Afb-daemon makes no distinction between lower case
-and upper case when searching for API/VERB.
-
-### Names for methods
-
-The names of methods VERBs are totally free and not checked.
-
-However, the validity rules for method's VERB name are the
-same as for Binding API name except that the dot(.) character
-is forbidden.
-
-Afb-daemon makes no case distinction when searching for an API by name.
-
-### Names for arguments
-
-Argument's name are not restricted and can be everything you wish.
-
-> Warning arguments search is case sensitive and "index" and "Index"
-> are not two different arguments.
-
-### Forging names widely available
-
-The key names of javascript object can be almost
-anything using the arrayed notation:
-
-	object[key] = value
-
-Nevertheless this is not the case with javascript dot notation:
-
-	object.key = value
-
-Using the dot notation, the key must be a valid javascript
-identifier and dash(-) as well as few other reserved characters cannot be used.
-
-For this reason, we advise developers to chose name compatible with both
-javascript and HTML notation.
-
-It is a good practice, even for arguments not to rely on case sensitivity.
-This may reduce headache strength at debug time, especially with interpreted
-language like javascript that may not warn you that a variable was not defined.
-
-Declaration of methods and initialisation of the bindings
----------------------------------------------------------
-
-### Declaration of methods
-
-To be active, binding's methods should be declared to
-***afb-daemon***. Furthermore, the binding itself must be recorded.
-
-The registration mechanism is very basic: when ***afb-daemon*** starts,
-it loads all bindings listed in: command line or configuration file.
-
-Loading a binding follows the following steps:
-
-1. Afb-daemon loads the binding with *dlopen*.
-
-2. Afb-daemon searches for a symbol named **afbBindingV1Register** using *dlsym*.
-This symbol is assumed to be the exported initialisation function of the binding.
-
-3. Afb-daemon builds an interface object for the binding.
-
-4. Afb-daemon calls the found function **afbBindingV1Register** with interface pointer
-as parameter.
-
-5. Function **afbBindingV1Register** setups the binding and initialises it.
-
-6. Function **afbBindingV1Register** returns the pointer to a structure
-describing the binding: version, name (prefix or API name), and list of methods.
-
-7. Afb-daemon checks that the returned version and name can be managed.
-If so, binding and its methods are register to become usable as soon as
-***afb-daemon*** initialisation is finished.
-
-### Initialisation of bindings
-
-The bindings initialisation is the final step made at the end of declaration of
-methods. This will initialize the binding and make its ***afb-daemon***'s
-interface fully functional.
-
-So, afb-daemon binder call **afbBindingV1ServiceInit** as final step to a
-binding. This will allows the binding to call features in its name and as saw in
-[Binder events guide](afb-events-guide.md) you can create an event only at this
-moment and not before. Before that it will fail because afb-daemon doesn't know
-the binding name.
-
-**afbBindingV1ServiceInit** is defined as below:
-
-```C
-/*
- * When a binding have an exported implementation of the
- * function 'afbBindingV1ServiceInit', defined below,
- * the framework calls it for initialising the service after
- * registration of all bindings.
- *
- * The object 'service' should be recorded. It has functions that
- * allows the binding to call features with its own personality.
- *
- * The function should return 0 in case of success or, else, should return
- * a negative value.
- */
-extern int afbBindingV1ServiceInit(struct afb_service service);
-```
-
-### Application binding example: tic-tac-toe
-
-If we continue our tic-tac-toe example, here after the code used for
-**afbBindingV1Register** implementation from binding *tic-tac-toe*:
-
-```C
-/*
- * activation function for registering the binding called by afb-daemon
- */
-const struct afb_binding *afbBindingV1Register(const struct afb_binding_interface *itf)
-{
-   afbitf = itf;         // records the interface for accessing afb-daemon
-   return &binding_description;  // returns the description of the binding
-}
-```
-
-It is a very minimal initialisation function because *tic-tac-toe* binding doesn't
-have any application related initialisation step. It merely record daemon's interface
-and returns its description.
-
-The variable **afbitf** is a binding global variable. It keeps the
-interface to ***afb-daemon*** that should be used for logging and pushing events.
-Here is its declaration:
-
-```C
-/*
- * the interface to afb-daemon
- */
-const struct afb_binding_interface *afbitf;
-```
-
-The description of the binding is defined here after.
-
-```C
-/*
- * array of the methods exported to afb-daemon
- */
-static const struct afb_verb_desc_v1 binding_methods[] = {
-   /* VERB'S NAME     SESSION MANAGEMENT          FUNCTION TO CALL  SHORT DESCRIPTION */
-   { .name= "new",   .session= AFB_SESSION_NONE, .callback= new,   .info= "Starts a new game" },
-   { .name= "play",  .session= AFB_SESSION_NONE, .callback= play,  .info= "Asks the server to play" },
-   { .name= "move",  .session= AFB_SESSION_NONE, .callback= move,  .info= "Tells the client move" },
-   { .name= "board", .session= AFB_SESSION_NONE, .callback= board, .info= "Get the current board" },
-   { .name= "level", .session= AFB_SESSION_NONE, .callback= level, .info= "Set the server level" },
-   { .name= "join",  .session= AFB_SESSION_CHECK,.callback= join,  .info= "Join a board" },
-   { .name= "undo",  .session= AFB_SESSION_NONE, .callback= undo,  .info= "Undo the last move" },
-   { .name= "wait",  .session= AFB_SESSION_NONE, .callback= wait,  .info= "Wait for a change" },
-   { .name= NULL } /* marker for end of the array */
-};
-
-/*
- * description of the binding for afb-daemon
- */
-static const struct afb_binding binding_description =
-{
-   /* description conforms to VERSION 1 */
-   .type= AFB_BINDING_VERSION_1,
-   .v1= {				/* fills the v1 field of the union when AFB_BINDING_VERSION_1 */
-      .prefix= "tictactoe",		/* the API name (or binding name or prefix) */
-      .info= "Sample tac-tac-toe game",	/* short description of of the binding */
-      .methods = binding_methods		/* the array describing the methods of the API */
-   }
-};
-```
-
-The structure **binding_description** describes the binding.
-It declares the type and version of the binding, its name, a short description
-and its methods list.
-
-The list of methods is an array of structures describing the methods and terminated by a NULL marker.
-
-In version one of afb-damon binding, a method description contains 4 fields:
-
-- the name of the method,
-
-- the session management flags,
-
-- the implementation function to be call for the method,
-
-- a short description.
-
-The structure describing methods is defined as follows:
-
-```C
-/*
- * Description of one method of the API provided by the binding
- * This enumeration is valid for bindings of type 1
- */
-struct afb_verb_desc_v1
-{
-       const char *name;                       /* name of the method */
-       enum AFB_session_v1 session;            /* authorisation and session requirements of the method */
-       void (*callback)(struct afb_req req);   /* callback function implementing the method */
-       const char *info;                       /* textual description of the method */
-};
-```
-
-For technical reasons, the enumeration **enum AFB_session_v1** is not exactly an
-enumeration but the wrapper of constant definitions that can be mixed using bitwise or
-(the C operator |).
-
-The constants that can bit mixed are:
-
-Constant name            | Meaning
--------------------------|-------------------------------------------------------------
-**AFB_SESSION_CREATE**   | Equals to AFB_SESSION_LOA_EQ_0|AFB_SESSION_RENEW
-**AFB_SESSION_CLOSE**    | Closes the session after the reply and set the LOA to 0
-**AFB_SESSION_RENEW**    | Refreshes the token of authentification
-**AFB_SESSION_CHECK**    | Just requires the token authentification
-**AFB_SESSION_LOA_LE_0** | Requires the current LOA to be lesser then or equal to 0
-**AFB_SESSION_LOA_LE_1** | Requires the current LOA to be lesser then or equal to 1
-**AFB_SESSION_LOA_LE_2** | Requires the current LOA to be lesser then or equal to 2
-**AFB_SESSION_LOA_LE_3** | Requires the current LOA to be lesser then or equal to 3
-**AFB_SESSION_LOA_GE_0** | Requires the current LOA to be greater then or equal to 0
-**AFB_SESSION_LOA_GE_1** | Requires the current LOA to be greater then or equal to 1
-**AFB_SESSION_LOA_GE_2** | Requires the current LOA to be greater then or equal to 2
-**AFB_SESSION_LOA_GE_3** | Requires the current LOA to be greater then or equal to 3
-**AFB_SESSION_LOA_EQ_0** | Requires the current LOA to be equal to 0
-**AFB_SESSION_LOA_EQ_1** | Requires the current LOA to be equal to 1
-**AFB_SESSION_LOA_EQ_2** | Requires the current LOA to be equal to 2
-**AFB_SESSION_LOA_EQ_3** | Requires the current LOA to be equal to 3
-
-If any of this flag is set, ***afb-daemon*** requires an authentication token
-as if **AFB_SESSION_CHECK** flag was also set.
-
-The special value **AFB_SESSION_NONE** is zero and can be used to bypass token check.
-
-> Note that **AFB_SESSION_CREATE** and **AFB_SESSION_CLOSE** might be removed in later versions.
-
-Sending messages to the log system
-----------------------------------
-
-Afb-daemon provides 4 levels of verbosity and 5 methods for logging messages.
-
-The verbosity is managed. Options allow the change the verbosity of ***afb-daemon***
-and the verbosity of the bindings can be set binding by binding.
-
-The methods for logging messages are defined as macros that test the
-verbosity level and that call the real logging function only if the
-message must be output. This avoid evaluation of arguments of the
-formatting messages if the message must not be output.
-
-### Verbs for logging messages
-
-The 5 logging methods are:
-
-Macro   | Verbosity | Meaning                           | syslog level
---------|:---------:|-----------------------------------|:-----------:
-ERROR   |     0     | Error conditions                  |     3
-WARNING |     1     | Warning conditions                |     4
-NOTICE  |     1     | Normal but significant condition  |     5
-INFO    |     2     | Informational                     |     6
-DEBUG   |     3     | Debug-level messages              |     7
-
-You can note that the 2 methods **WARNING** and **NOTICE** have the same level
-of verbosity. But they don't have the same *syslog level*. It means that
-they are output with a different level on the logging system.
-
-All of these methods have the same signature:
-
-```C
-void ERROR(const struct afb_binding_interface *afbitf, const char *message, ...);
-```
-
-The first argument **afbitf** is the interface to afb daemon that the
-binding received at initialisation time when **afbBindingV1Register** is called.
-
-The second argument **message** is a formatting string compatible with printf/sprintf.
-
-The remaining arguments are arguments of the formating message like with printf.
-
-### Managing verbosity
-
-Depending on the level of verbosity, the messages are output or not.
-The following table explains what messages will be output depending
-ont the verbosity level.
-
-Level of verbosity | Outputed macro
-:-----------------:|--------------------------
-0                  | ERROR
-1                  | ERROR + WARNING + NOTICE
-2                  | ERROR + WARNING + NOTICE + INFO
-3                  | ERROR + WARNING + NOTICE + INFO + DEBUG
-
-### Output format and destination
-
-The syslog level is used for forging a prefix to the message.
-The prefixes are:
-
-syslog level | prefix
-:-----------:|---------------
-0            | <0> EMERGENCY
-1            | <1> ALERT
-2            | <2> CRITICAL
-3            | <3> ERROR
-4            | <4> WARNING
-5            | <5> NOTICE
-6            | <6> INFO
-7            | <7> DEBUG
-
-
-The message is pushed to standard error.
-The final destination of the message depends on how systemd service
-was configured through its variable **StandardError**. It can be
-journal, syslog or kmsg. (See man sd-daemon).
-
-Sending events
---------------
-
-Specific documentation exists about [sending events](afb-events-guide.md).
-
-The binding *tic-tac-toe* broadcasts events when the board changes. This is done
-in the function ***changed***:
-
-```C
-/*
- * signals a change of the board
- */
-static void changed(struct board *board, const char *reason)
-{
-	...
-	struct json_object *description;
-
-	/* get the description */
-	description = describe(board);
-
-	...
-
-	afb_daemon_broadcast_event(afbitf->daemon, reason, description);
-}
-```
-
-The description of the changed board is pushed via the daemon interface.
-
-Within binding *tic-tac-toe*, *reason* indicates the origin of
-the change. In function **afb_daemon_broadcast_event** the second
-parameter is the name of broadcasted event. The third argument is the
-object that is transmitted with the event.
-
-Function **afb_daemon_broadcast_event** is defined here after:
-
-```C
-/*
- * Broadcasts widely the event of 'name' with the data 'object'.
- * 'object' can be NULL.
- * 'daemon' MUST be the daemon given in interface when activating the binding.
- *
- * For convenience, the function calls 'json_object_put' for 'object'.
- * Thus, in the case where 'object' should remain available after
- * the function returns, the function 'json_object_get' shall be used.
- */
-void afb_daemon_broadcast_event(struct afb_daemon daemon, const char *name, struct json_object *object);
-```
-
-> Be aware, as with reply functions **object** is automatically released using
-> **json_object_put** when using this function. Call **json_object_get** before
-> calling **afb_daemon_broadcast_event** to keep **object** available
-> after function returns.
-
-Event name received by listeners is prefixed with binding name.
-So when a change occurs after a move, the reason is **move** and every clients
-receive an event **tictactoe/move**.
-
-> Note that nothing is said about case sensitivity of event names.
-> However, the event is always prefixed with the name that the binding
-> declared, with the same case, followed with a slash /.
-> Thus it is safe to compare event using a case sensitive comparison.
-
-Writing a synchronous method implementation
------------------------------------------
-
-The method **tictactoe/board** is a synchronous implementation.
-Here is its listing:
-
-```C
-/*
- * get the board
- */
-static void board(struct afb_req req)
-{
-	struct board *board;
-	struct json_object *description;
-
-	/* retrieves the context for the session */
-	board = board_of_req(req);
-	INFO(afbitf, "method 'board' called for boardid %d", board->id);
-
-	/* describe the board */
-	description = describe(board);
-
-	/* send the board's description */
-	afb_req_success(req, description, NULL);
-}
-```
-
-This example shows many aspects of a synchronous
-method implementation. Let summarise it:
-
-1. The function **board_of_req** retrieves the context stored
-for the binding: the board.
-
-2. The macro **INFO** sends a message of kind *INFO*
-to the logging system. The global variable named **afbitf**
-used represents the interface to ***afb-daemon***.
-
-3. The function **describe** creates a json_object representing
-the board.
-
-4. The function **afb_req_success** sends the reply, attaching to
-it the object *description*.
-
-### The incoming request
-
-For any implementation, the request is received by a structure of type
-**struct afb_req**.
-
-> Note that this is a PLAIN structure, not a pointer to a structure.
-
-The definition of **struct afb_req** is:
-
-```C
-/*
- * Describes the request by bindings from afb-daemon
- */
-struct afb_req {
-	const struct afb_req_itf *itf;	/* the interfacing functions */
-	void *closure;			/* the closure for functions */
-};
-```
-
-It contains two pointers: first one *itf*, points to functions used
-to handle internal request. Second one *closure* point onto function closure.
-
-> The structure must never be used directly.
-> Instead developer should use the intended functions provided
-> by ***afb-daemon*** as described here after.
-
-*req* is used to get arguments of the request, to send
-answer, to store session data.
-
-This object and its interface is defined and documented
-in the file names *afb/afb-req-itf.h*
-
-The above example uses twice *req* object request.
-
-The first time, to retrieve the board attached to the session of the request.
-
-The second time, to send the reply: an object that describes the current board.
-
-### Associating a client context to a session
-
-When *tic-tac-toe* binding receives a request, it musts get
-the board describing the game associated to the session.
-
-For a binding, having data associated to a session is common.
-This data is called "binding context" for the session.
-Within *tic-tac-toe* binding the context is the board.
-
-Requests *afb_req* offer four functions for storing and retrieving session
-associated context.
-
-These functions are:
-
-- **afb_req_context_get**:
-  retrieves context data stored for current binding.
-
-- **afb_req_context_set**:
-  store context data of current binding.
-
-- **afb_req_context**:
-  if exist retrieves context data of current binding.
-  if context does not yet exist, creates a new context and store it.
-
-- **afb_req_context_clear**:
-  reset the stored context data.
-
-The binding *tictactoe* use a convenient function to retrieve
-its context: the board. This function is *board_of_req*:
-
-```C
-/*
- * retrieves the board of the request
- */
-static inline struct board *board_of_req(struct afb_req req)
-{
-	return afb_req_context(req, (void*)get_new_board, (void*)release_board);
-}
-```
-
-The function **afb_req_context** ensures an existing context
-for the session of the request.
-Its two last arguments are functions to allocate and free context.
-Note function type casts to avoid compilation warnings.
-
-Here is the definition of the function **afb_req_context**
-
-```C
-/*
- * Gets the pointer stored by the binding for the session of 'req'.
- * If the stored pointer is NULL, indicating that no pointer was
- * already stored, afb_req_context creates a new context by calling
- * the function 'create_context' and stores it with the freeing function
- * 'free_context'.
- */
-static inline void *afb_req_context(struct afb_req req, void *(*create_context)(), void (*free_context)(void*))
-{
-	void *result = afb_req_context_get(req);
-	if (result == NULL) {
-		result = create_context();
-		afb_req_context_set(req, result, free_context);
-	}
-	return result;
-}
-```
-
-The second argument if the function that creates the context.
-For binding *tic-tac-toe* (function **get_new_board**).
-The function **get_new_board** creates a new board and set usage its count to 1.
-The boards are checking usage count to free resources when not used.
-
-The third argument is a function that frees context resources.
-For binding *tic-tac-toe* (function **release_board**).
-The function **release_board** decrease usage count of the board passed in
-argument. When usage count falls to zero, data board are freed.
-
-Definition of other functions dealing with contexts:
-
-```C
-/*
- * Gets the pointer stored by the binding for the session of 'req'.
- * When the binding has not yet recorded a pointer, NULL is returned.
- */
-void *afb_req_context_get(struct afb_req req);
-
-/*
- * Stores for the binding the pointer 'context' to the session of 'req'.
- * The function 'free_context' will be called when the session is closed
- * or if binding stores an other pointer.
- */
-void afb_req_context_set(struct afb_req req, void *context, void (*free_context)(void*));
-
-/*
- * Frees the pointer stored by the binding for the session of 'req'
- * and sets it to NULL.
- *
- * Shortcut for: afb_req_context_set(req, NULL, NULL)
- */
-static inline void afb_req_context_clear(struct afb_req req)
-{
-	afb_req_context_set(req, NULL, NULL);
-}
-```
-
-### Sending reply to a request
-
-Two kinds of replies: successful or failure.
-
-> Sending a reply to a request MUST be done once and only once.
-
-It exists two functions for "success" replies: **afb_req_success** and **afb_req_success_f**.
-
-```C
-/*
- * Sends a reply of kind success to the request 'req'.
- * The status of the reply is automatically set to "success".
- * Its send the object 'obj' (can be NULL) with an
- * informationnal comment 'info (can also be NULL).
- *
- * For convenience, the function calls 'json_object_put' for 'obj'.
- * Thus, in the case where 'obj' should remain available after
- * the function returns, the function 'json_object_get' shall be used.
- */
-void afb_req_success(struct afb_req req, struct json_object *obj, const char *info);
-
-/*
- * Same as 'afb_req_success' but the 'info' is a formatting
- * string followed by arguments.
- *
- * For convenience, the function calls 'json_object_put' for 'obj'.
- * Thus, in the case where 'obj' should remain available after
- * the function returns, the function 'json_object_get' shall be used.
- */
-void afb_req_success_f(struct afb_req req, struct json_object *obj, const char *info, ...);
-```
-
-It exists two functions for "failure" replies: **afb_req_fail** and **afb_req_fail_f**.
-
-```C
-/*
- * Sends a reply of kind failure to the request 'req'.
- * The status of the reply is set to 'status' and an
- * informational comment 'info' (can also be NULL) can be added.
- *
- * Note that calling afb_req_fail("success", info) is equivalent
- * to call afb_req_success(NULL, info). Thus even if possible it
- * is strongly recommended to NEVER use "success" for status.
- *
- * For convenience, the function calls 'json_object_put' for 'obj'.
- * Thus, in the case where 'obj' should remain available after
- * the function returns, the function 'json_object_get' shall be used.
- */
-void afb_req_fail(struct afb_req req, const char *status, const char *info);
-
-/*
- * Same as 'afb_req_fail' but the 'info' is a formatting
- * string followed by arguments.
- *
- * For convenience, the function calls 'json_object_put' for 'obj'.
- * Thus, in the case where 'obj' should remain available after
- * the function returns, the function 'json_object_get' shall be used.
- */
-void afb_req_fail_f(struct afb_req req, const char *status, const char *info, ...);
-```
-
-> For convenience, these functions automatically call **json_object_put** to release **obj**.
-> Because **obj** usage count is null after being passed to a reply function, it SHOULD not be used anymore.
-> If exceptionally **obj** needs to remain usable after reply function then using **json_object_get** on **obj**
-> to increase usage count and cancels the effect the **json_object_put** is possible.
-
-Getting argument of invocation
-------------------------------
-
-Many methods expect arguments. Afb-daemon's bindings
-retrieve arguments by name and not by position.
-
-Arguments are passed by requests through either HTTP
-or WebSockets.
-
-For example, the method **join** of binding **tic-tac-toe**
-expects one argument: the *boardid* to join. Here is an extract:
-
-```C
-/*
- * Join a board
- */
-static void join(struct afb_req req)
-{
-	struct board *board, *new_board;
-	const char *id;
-
-	/* retrieves the context for the session */
-	board = board_of_req(req);
-	INFO(afbitf, "method 'join' called for boardid %d", board->id);
-
-	/* retrieves the argument */
-	id = afb_req_value(req, "boardid");
-	if (id == NULL)
-		goto bad_request;
-	...
-```
-
-The function **afb_req_value** searches in the request *req*
-for argument name passed in the second argument. When argument name
-is not passed, **afb_req_value** returns NULL.
-
-> The search is case sensitive and *boardid* is not equivalent to *BoardId*.
-> Nevertheless having argument names that only differ by name case is not a good idea.
-
-### Basic functions for querying arguments
-
-The function **afb_req_value** is defined here after:
-
-```C
-/*
- * Gets from the request 'req' the string value of the argument of 'name'.
- * Returns NULL if when there is no argument of 'name'.
- * Returns the value of the argument of 'name' otherwise.
- *
- * Shortcut for: afb_req_get(req, name).value
- */
-static inline const char *afb_req_value(struct afb_req req, const char *name)
-{
-	return afb_req_get(req, name).value;
-}
-```
-
-It is defined as a shortcut to call the function **afb_req_get**.
-That function is defined here after:
-
-```C
-/*
- * Gets from the request 'req' the argument of 'name'.
- * Returns a PLAIN structure of type 'struct afb_arg'.
- * When the argument of 'name' is not found, all fields of result are set to NULL.
- * When the argument of 'name' is found, the fields are filled,
- * in particular, the field 'result.name' is set to 'name'.
- *
- * There is a special name value: the empty string.
- * The argument of name "" is defined only if the request was made using
- * an HTTP POST of Content-Type "application/json". In that case, the
- * argument of name "" receives the value of the body of the HTTP request.
- */
-struct afb_arg afb_req_get(struct afb_req req, const char *name);
-```
-
-That function takes 2 parameters: the request and the name
-of the argument to retrieve. It returns a PLAIN structure of
-type **struct afb_arg**.
-
-There is a special name that is defined when the request is
-of type HTTP/POST with a Content-Type being application/json.
-This name is **""** (the empty string). In that case, the value
-of this argument of empty name is the string received as a body
-of the post and is supposed to be a JSON string.
-
-The definition of **struct afb_arg** is:
-
-```C
-/*
- * Describes an argument (or parameter) of a request
- */
-struct afb_arg {
-	const char *name;	/* name of the argument or NULL if invalid */
-	const char *value;	/* string representation of the value of the argument */
-				/* original filename of the argument if path != NULL */
-	const char *path;	/* if not NULL, path of the received file for the argument */
-				/* when the request is finalized this file is removed */
-};
-```
-
-The structure returns the data arguments that are known for the
-request. This data include a field named **path**. This **path**
-can be accessed using the function **afb_req_path** defined here after:
-
-```C
-/*
- * Gets from the request 'req' the path for file attached to the argument of 'name'.
- * Returns NULL if when there is no argument of 'name' or when there is no file.
- * Returns the path of the argument of 'name' otherwise.
- *
- * Shortcut for: afb_req_get(req, name).path
- */
-static inline const char *afb_req_path(struct afb_req req, const char *name)
-{
-	return afb_req_get(req, name).path;
-}
-```
-
-The path is only defined for HTTP/POST requests that send file.
-
-### Arguments for received files
-
-As it is explained above, clients can send files using HTTP/POST requests.
-
-Received files are attached to "file" argument name. For example, the
-following HTTP fragment (from test/sample-post.html)
-will send an HTTP/POST request to the method
-**post/upload-image** with 2 arguments named *file* and
-*hidden*.
-
-```html
-<h2>Sample Post File</h2>
-<form enctype="multipart/form-data">
-    <input type="file" name="file" />
-    <input type="hidden" name="hidden" value="bollobollo" />
-    <br>
-    <button formmethod="POST" formaction="api/post/upload-image">Post File</button>
-</form>
-```
-
-Argument named **file** should have both its value and path defined.
-
-The value is the name of the file as it was set by the HTTP client.
-Generally it is the filename on client side.
-
-The path is the effective path of saved file on the temporary local storage
-area of the application. This is a randomly generated and unique filename.
-It is not linked with the original filename as used on client side.
-
-After success the binding can use the uploaded file directly from local storage path with no restriction:
-read, write, remove, copy, rename...
-Nevertheless when request reply is set and query terminated, the uploaded temporary file at
-path is destroyed.
-
-### Arguments as a JSON object
-
-Bindings may also request every arguments of a given call as one single object.
-This feature is provided by the function **afb_req_json** defined here after:
-
-```C
-/*
- * Gets from the request 'req' the json object hashing the arguments.
- * The returned object must not be released using 'json_object_put'.
- */
-struct json_object *afb_req_json(struct afb_req req);
-```
-
-It returns a json object. This object depends on how the request was built:
-
-- For HTTP requests, this json object uses key names mapped on argument name.
-Values are either string for common arguments or object ie: { "file": "...", "path": "..." }
-
-- For WebSockets requests, returned directly the object as provided by the client.
-
-> In fact, for Websockets requests, the function **afb_req_value**
-> can be seen as a shortcut to
-> ***json_object_get_string(json_object_object_get(afb_req_json(req), name))***
-
-
-Writing an asynchronous method implementation
--------------------------------------------
-
-The *tic-tac-toe* example allows two clients or more to share the same board.
-This is implemented by the method **join** that illustrated partly how to
-retrieve arguments.
-
-When two or more clients are sharing a same board, one of them can wait
-until the state of the board changes, but this could also be implemented using
-events because an event is generated each time the board changes.
-
-In this case, the reply to the wait is sent only when the board changes.
-See the diagram below:
-
-![tic-tac-toe_diagram][tic-tac-toe_diagram]
-
-Here, this is an invocation of the binding by an other client that
-unblock the suspended *wait* call.
-Nevertheless in most case this should be a timer, a hardware event, a sync with
-a concurrent process or thread, ...
-
-Common case of an asynchronous implementation.
-
-Here is the listing of the function **wait**:
-
-```C
-static void wait(struct afb_req req)
-{
-	struct board *board;
-	struct waiter *waiter;
-
-	/* retrieves the context for the session */
-	board = board_of_req(req);
-	INFO(afbitf, "method 'wait' called for boardid %d", board->id);
-
-	/* creates the waiter and enqueues it */
-	waiter = calloc(1, sizeof *waiter);
-	waiter->req = req;
-	waiter->next = board->waiters;
-	afb_req_addref(req);
-	board->waiters = waiter;
-}
-```
-
-After retrieving the board, the function adds a new waiter to
-waiters list and returns without setting a reply.
-
-Before returning, it increases **req** request's reference count using **afb_req_addref** function.
-
-> When a method returns without setting a reply,
-> it **MUST** increment request's reference count
-> using **afb_req_addref**. If unpredictable behaviour may pop up.
-
-Later, when a board changes, it calls *tic-tac-toe* **changed** function
-with reason of change in parameter.
-
-Here is the full listing of the function **changed**:
-
-```C
-/*
- * signals a change of the board
- */
-static void changed(struct board *board, const char *reason)
-{
-	struct waiter *waiter, *next;
-	struct json_object *description;
-
-	/* get the description */
-	description = describe(board);
-
-	waiter = board->waiters;
-	board->waiters = NULL;
-	while (waiter != NULL) {
-		next = waiter->next;
-		afb_req_success(waiter->req, json_object_get(description), reason);
-		afb_req_unref(waiter->req);
-		free(waiter);
-		waiter = next;
-	}
-
-	afb_event_sender_push(afb_daemon_get_event_sender(afbitf->daemon), reason, description);
-}
-```
-
-The list of waiters is walked and a reply is sent to each waiter.
-After sending the reply, the reference count of the request
-is decremented using **afb_req_unref** to allow resources to be freed.
-
-> The reference count **MUST** be decremented using **afb_req_unref** to free
-> resources and avoid memory leaks.
-> This usage count decrement should happen **AFTER** setting reply or
-> bad things may happen.
-
-Sending messages to the log system
-----------------------------------
-
-Afb-daemon provides 4 levels of verbosity and 5 methods for logging messages.
-
-The verbosity is managed. Options allow the change the verbosity of ***afb-daemon***
-and the verbosity of the bindings can be set binding by binding.
-
-The methods for logging messages are defined as macros that test the
-verbosity level and that call the real logging function only if the
-message must be output. This avoid evaluation of arguments of the
-formatting messages if the message must not be output.
-
-### Verbs for logging messages
-
-The 5 logging methods are:
-
-Macro   | Verbosity | Meaning                           | syslog level
---------|:---------:|-----------------------------------|:-----------:
-ERROR   |     0     | Error conditions                  |     3
-WARNING |     1     | Warning conditions                |     4
-NOTICE  |     1     | Normal but significant condition  |     5
-INFO    |     2     | Informational                     |     6
-DEBUG   |     3     | Debug-level messages              |     7
-
-You can note that the 2 methods **WARNING** and **NOTICE** have the same level
-of verbosity. But they don't have the same *syslog level*. It means that
-they are output with a different level on the logging system.
-
-All of these methods have the same signature:
-
-```C
-void ERROR(const struct afb_binding_interface *afbitf, const char *message, ...);
-```
-
-The first argument **afbitf** is the interface to afb daemon that the
-binding received at initialisation time when **afbBindingV1Register** is called.
-
-The second argument **message** is a formatting string compatible with printf/sprintf.
-
-The remaining arguments are arguments of the formating message like with printf.
-
-### Managing verbosity
-
-Depending on the level of verbosity, the messages are output or not.
-The following table explains what messages will be output depending
-ont the verbosity level.
-
-Level of verbosity | Outputed macro
-:-----------------:|--------------------------
-0                  | ERROR
-1                  | ERROR + WARNING + NOTICE
-2                  | ERROR + WARNING + NOTICE + INFO
-3                  | ERROR + WARNING + NOTICE + INFO + DEBUG
-
-### Output format and destination
-
-The syslog level is used for forging a prefix to the message.
-The prefixes are:
-
-syslog level | prefix
-:-----------:|---------------
-0            | <0> EMERGENCY
-1            | <1> ALERT
-2            | <2> CRITICAL
-3            | <3> ERROR
-4            | <4> WARNING
-5            | <5> NOTICE
-6            | <6> INFO
-7            | <7> DEBUG
-
-
-The message is pushed to standard error.
-The final destination of the message depends on how systemd service
-was configured through its variable **StandardError**. It can be
-journal, syslog or kmsg. (See man sd-daemon).
-
-Sending events
---------------
-
-Since version 0.5, bindings can broadcast events to any potential listener.
-As today only unattended events are supported. Targeted events are expected for
-next coming version.
-
-The binding *tic-tac-toe* broadcasts events when the board changes.
-This is done in the function **changed**:
-
-```C
-/*
- * signals a change of the board
- */
-static void changed(struct board *board, const char *reason)
-{
-	...
-	struct json_object *description;
-
-	/* get the description */
-	description = describe(board);
-
-	...
-
-	afb_daemon_broadcast_event(afbitf->daemon, reason, description);
-}
-```
-
-The description of the changed board is pushed via the daemon interface.
-
-Within binding *tic-tac-toe*, *reason* indicates the origin of
-the change. In function **afb_daemon_broadcast_event** the second
-parameter is the name of broadcasted event. The third argument is the
-object that is transmitted with the event.
-
-Function **afb_daemon_broadcast_event** is defined here after:
-
-```C
-/*
- * Broadcasts widely the event of 'name' with the data 'object'.
- * 'object' can be NULL.
- * 'daemon' MUST be the daemon given in interface when activating the binding.
- *
- * For convenience, the function calls 'json_object_put' for 'object'.
- * Thus, in the case where 'object' should remain available after
- * the function returns, the function 'json_object_get' shall be used.
- */
-void afb_daemon_broadcast_event(struct afb_daemon daemon, const char *name, struct json_object *object);
-```
-
-> Be aware, as with reply functions **object** is automatically released using
-> **json_object_put** when using this function. Call **json_object_get** before
-> calling **afb_daemon_broadcast_event** to keep **object** available
-> after function returns.
-
-Event name received by listeners is prefixed with binding name.
-So when a change occurs after a move, the reason is **move** and every clients
-receive an event **tictactoe/move**.
-
-> Note that nothing is said about case sensitivity of event names.
-> However, the event is always prefixed with the name that the binding
-> declared, with the same case, followed with a slash /.
-> Thus it is safe to compare event using a case sensitive comparison.
-
-How to build a binding
----------------------
-
-Afb-daemon provides a *pkg-config* configuration file that can be
-queried by providing ***afb-daemon*** in command line arguments.
-This configuration file provides data that should be used
-for bindings compilation. Examples:
-
-```bash
-$ pkg-config --cflags afb-daemon
-$ pkg-config --libs afb-daemon
-```
-
-### Example for cmake meta build system
-
-This example is the extract for building the binding *afm-main* using *CMAKE*.
-
-```cmake
-pkg_check_modules(afb afb-daemon)
-if(afb_FOUND)
-	message(STATUS "Creation afm-main-binding for AFB-DAEMON")
-	add_library(afm-main-binding MODULE afm-main-binding.c)
-	target_compile_options(afm-main-binding PRIVATE ${afb_CFLAGS})
-	target_include_directories(afm-main-binding PRIVATE ${afb_INCLUDE_DIRS})
-	target_link_libraries(afm-main-binding utils ${afb_LIBRARIES})
-	set_target_properties(afm-main-binding PROPERTIES
-		PREFIX ""
-		LINK_FLAGS "-Wl,--version-script=${CMAKE_CURRENT_SOURCE_DIR}/afm-main-binding.export-map"
-	)
-	install(TARGETS afm-main-binding LIBRARY DESTINATION ${binding_dir})
-else()
-	message(STATUS "Not creating the binding for AFB-DAEMON")
-endif()
-```
-
-Let now describe some of these lines.
-
-```cmake
-pkg_check_modules(afb afb-daemon)
-```
-
-This first lines searches to the *pkg-config* configuration file for
-**afb-daemon**. Resulting data are stored in the following variables:
-
-Variable          | Meaning
-------------------|------------------------------------------------
-afb_FOUND         | Set to 1 if afb-daemon binding development files exist
-afb_LIBRARIES     | Only the libraries (w/o the '-l') for compiling afb-daemon bindings
-afb_LIBRARY_DIRS  | The paths of the libraries (w/o the '-L') for compiling afb-daemon bindings
-afb_LDFLAGS       | All required linker flags for compiling afb-daemon bindings
-afb_INCLUDE_DIRS  | The '-I' preprocessor flags (w/o the '-I') for compiling afb-daemon bindings
-afb_CFLAGS        | All required cflags for compiling afb-daemon bindings
-
-If development files are found, the binding can be added to the set of
-target to build.
-
-```cmake
-add_library(afm-main-binding MODULE afm-main-binding.c)
-```
-
-This line asks to create a shared library having a single
-source file named afm-main-binding.c to be compiled.
-The default name of the created shared object is
-**libafm-main-binding.so**.
-
-```cmake
-set_target_properties(afm-main-binding PROPERTIES
-	PREFIX ""
-	LINK_FLAGS "-Wl,--version-script=${CMAKE_CURRENT_SOURCE_DIR}/afm-main-binding.export-map"
-)
-```
-
-This lines are doing two things:
-
-1. It renames the built library from **libafm-main-binding.so** to **afm-main-binding.so**
-by removing the implicitly added prefix *lib*. This step is not mandatory
-because afb-daemon doesn't check names of files at load time.
-The only filename convention used by afb-daemon relates to **.so** termination.
-*.so pattern is used when afb-daemon automatically discovers binding from a directory hierarchy.
-
-2. It applies a version script at link time to only export the reserved name
-**afbBindingV1Register** for registration entry point. By default, when building
-a shared library linker exports all the public symbols (C functions that are not **static**).
-
-Next line are:
-
-```cmake
-target_include_directories(afm-main-binding PRIVATE ${afb_INCLUDE_DIRS})
-target_link_libraries(afm-main-binding utils ${afb_LIBRARIES})
-```
-
-As you can see it uses the variables computed by ***pkg_check_modules(afb afb-daemon)***
-to configure the compiler and the linker.
-
-### Exporting the function afbBindingV1Register
-
-The function **afbBindingV1Register** MUST be exported. This can be achieved
-using a version script at link time. Here after is a version script used for
-*tic-tac-toe* (bindings/samples/export.map).
-
-	{ global: afbBindingV1Register; local: *; };
-
-This sample [version script](https://sourceware.org/binutils/docs-2.26/ld/VERSION.html#VERSION)
-exports as global the symbol *afbBindingV1Register* and hides any
-other symbols.
-
-This version script is added to the link options using the
-option **--version-script=export.map** is given directly to the
-linker or using the option **-Wl,--version-script=export.map**
-when the option is given to the C compiler.
-
-### Building within yocto
-
-Adding a dependency to afb-daemon is enough. See below:
-
-	DEPENDS += " afb-daemon "
-
-
-[tic-tac-toe_diagram]: pictures/tic-tac-toe.svg
diff --git a/doc/afb-daemon-vocabulary.md b/doc/afb-daemon-vocabulary.md
deleted file mode 100644
index c3b7c1ea..00000000
--- a/doc/afb-daemon-vocabulary.md
+++ /dev/null
@@ -1,98 +0,0 @@
-
-Vocabulary for AFB-DAEMON
-=========================
-
-## Binding
-
-A shared library object intended to add a functionality to an afb-daemon
-instance. It implements an API and may provide a service.
-
-Binding made for services can have specific entry point called after
-initialisation and before serving.
-
-## Event
-
-Message with data propagated from the services to the client and not expecting
-any reply.
-
-The current implementation allows to widely broadcast events to all clients.
-
-## Level of assurance (LOA)
-
-This level that can be from 0 to 3 represent the level of
-assurance that the services can expect from the session.
-
-The exact definition of the meaning of these levels and how to use it remains to
-be achieved.
-
-## Plugin
-
-Old name for binding, see binding.
-
-## Request
-
-A request is an invocation by a client to a binding method using a message
-transferred through some protocol: HTTP, WebSocket, DBUS... and served by
-***afb-daemon***
-
-## Reply/Response
-
-This is a message sent to client as the result of the request.
-
-## Service
-
-Service are made of bindings running by their side on their binder.
-It can serve many client. Each one attached to one session.
-
-The framework establishes connection between the services and
-the clients. Using DBus currently but other protocols are considered.
-
-## Session
-
-A session is meant to be the unique instance context of a client,
-which identify that instance across requests.
-
-Each session has an identifier. Session identifier generated by afb-daemon are
-UUIDs.
-
-Internally, afb-daemon offers a mechanism to attach data to sessions.
-When the session is closed or disappears, the data attached to that session
-are freed.
-
-## Token
-
-The token is an identifier that the client must give to be authenticated.
-
-At start, afb-daemon get an initial token. This initial token must be presented
-by incoming client to be authenticated.
-
-A token is valid only for a period.
-
-The token must be renewed periodically. When the token is renewed, afb-daemon
-sends the new token to the client.
-
-Tokens generated by afb-daemon are UUIDs.
-
-## UUID
-
-It stand for Universal Unique IDentifier.
-
-It is designed to create identifier in a way that avoid has much as possible
-conflicts. It means that if two different instances create an UUID, the
-probability that they create the same UUID is very low, near to zero.
-
-## x-afb-reqid
-
-Argument name that can be used with HTTP request. When this argument is given,
-it is automatically added to the "request" object of the answer.
-
-## x-afb-token
-
-Argument name meant to give the token without ambiguity.
-You can also use the name **token** but it may conflicts with others arguments.
-
-## x-afb-uuid
-
-Argument name for giving explicitly the session identifier without ambiguity.
-You can also use the name **uuid** but it may conflicts with others arguments.
-
diff --git a/doc/afb-events-guide.md b/doc/afb-events-guide.md
deleted file mode 100644
index aaa09be1..00000000
--- a/doc/afb-events-guide.md
+++ /dev/null
@@ -1,475 +0,0 @@
-Guide for developing with events
-================================
-
-Signaling agents are services that send events to any clients that
-subscribed for receiving it. The sent events carry any data.
-
-To have a good understanding of how to write a signaling agent, the
-actions of subscribing, unsubscribing, producing, sending and receiving
-events must be described and explained.
-
-Overview of events
-------------------
-
-The basis of a signaling agent is shown in the following figure:
-
-![scenario of using events](pictures/signaling-basis.svg)
-
-This figure shows the main role of the signaling framework for the events
-propagation.
-
-For people not familiar with the framework, a signaling agent and
-a “binding” are similar.
-
-### Subscribing and unsubscribing
-
-Subscribing is the action that makes a client able to receive data from a
-signaling agent. Subscription must create resources for generating the data, and
-for delivering the data to the client. These two aspects are not handled by the
-same piece of software. Generating the data is the responsibility of the
-developer of the signaling agent while delivering the data is handled by the
-framework.
-
-When a client subscribes for data, the agent must:
-
-1.  check that the subscription request is correct;
-2.  establish the computation chain of the required data, if not already
-    done;
-3.  create a named event for the computed data, if not already done;
-4.  ask the framework to establish the subscription to the event for the
-    request;
-5.  optionally give indications about the event in the reply to
-    the client.
-
-The first two steps are not involving the framework. They are linked to
-the business logic of the binding. The request can be any description of
-the requested data and the computing stream can be of any nature, this
-is specific to the binding.
-
-As said before, the framework uses and integrates **libsystemd** and its event
-loop. Within the framework, **libsystemd** is the standard API/library for
-bindings expecting to setup and handle I/O, timer or signal events.
-
-Steps 3 and 4 are bound to the framework.
-
-The agent must create an object for handling the propagation of produced
-data to its clients. That object is called “event” in the framework. An
-event has a name that allows clients to distinguish it from other
-events.
-
-Events are created using the ***afb\_daemon\_make\_event*** function
-that takes the name of the event. Example:
-
-```C
-	event = afb_daemon_make_event(afb_daemon, name);
-```
-
-Once created, the event can be used either to push data to its
-subscribers or to broadcast data to any listener.
-
-The event must be used to establish the subscription for the requesting
-client. This is done using the ***afb\_req\_subscribe*** function
-that takes the current request object and event and associates them
-together. Example:
-
-```C
-	rc = afb_req_subscribe(afb_req, event);
-```
-
-When successful, this function make the connection between the event and
-the client that emitted the request. The client becomes a subscriber of
-the event until it unsubscribes or disconnects. The
-***afb\_req\_subscribe*** function will fail if the client
-connection is weak: if the request comes from a HTTP link. To receive
-signals, the client must be connected. The AGL framework allows connections
-using WebSocket.
-
-The name of the event is either a well known name or an ad hoc name
-forged for the use case.
-
-Let's see a basic example: client A expects to receive the speed in km/h
-every second while client B expects the speed in mph twice a second. In
-that case, there are two different events because it is not the same
-unit and it is not the same frequency. Having two different events
-allows to associate clients to the correct event. But this doesn't tell
-any word about the name of these events. The designer of the signaling
-agent has two options for naming:
-
-1.  names can be the same (“speed” for example) with sent data
-    self describing itself or having a specific tag (requiring from
-    clients awareness about requesting both kinds of speed isn't safe).
-2.  names of the event include the variations (by example:
-    “speed-km/h-1Hz” and “speed-mph-2Hz”) and, in that case, sent data
-    can self describe itself or not.
-
-In both cases, the signaling agent might have to send the name of the
-event and/or an associated tag to its client in the reply of the
-subscription. This is part of the step 5 above.
-
-The framework only uses the event (not its name) for subscription,
-unsubscription and pushing.
-
-When the requested data is already generated and the event used for
-pushing it already exists, the signaling agent must not instantiate a
-new processing chain and must not create a new event object for pushing
-data. The signaling agent must reuse the existing chain and event.
-
-Unsubscribing is made by the signaling agent on a request of its client.
-The ***afb\_req\_unsubscribe*** function tells the framework to
-remove the requesting client from the event's list of subscribers.
-Example:
-
-```C
-	afb_req_unsubscribe(afb_req, event);
-```
-
-Subscription count does not matter to the framework: subscribing the
-same client several times has the same effect that subscribing only one
-time. Thus, when unsubscribing is invoked, it becomes immediately
-effective.
-
-#### More on naming events
-
-Within the AGL framework, a signaling agent is a binding that has an API
-prefix. This prefix is meant to be unique and to identify the binding
-API. The names of the events that this signaling agent creates are
-automatically prefixed by the framework, using the API prefix of the
-binding.
-
-Thus, if a signaling agent of API prefix ***api*** creates an event
-of name ***event*** and pushes data to that event, the subscribers
-will receive an event of name ***api/event***.
-
-### Generating and pushing signals and data
-
-This of the responsibility of the designer of the signaling agent to
-establish the processing chain for generating events. In many cases,
-this can be achieved using I/O or timer or signal events inserted in the
-main loop. For this case, the AGL framework uses **libsystemd** and
-provide a way to integrates to the main loop of this library using
-afb\_daemon\_get\_event\_loop. Example:
-
-```C
-	sdev = afb_daemon_get_event_loop(af_daemon);
-	rc = sd_event_add_io(sdev, &source, fd, EPOLLIN, myfunction, NULL);
-```
-
-In some other cases, the events are coming from D-Bus. In that case, the
-framework also uses **libsystemd** internally to access D-Bus. It provides
-two methods to get the available D-Bus objects, already existing and
-bound to the main**libsystemd**event loop. Use either
-***afb\_daemon\_get\_system\_bus*** or
-***afb\_daemon\_get\_user\_bus*** to get the required instance. Then
-use functions of **libsystemd** to handle D-Bus.
-
-In some rare cases, the generation of the data requires to start a new
-thread.
-
-When a data is generated and ready to be pushed, the signaling agent
-should call the function ***afb\_event\_push***. Example:
-
-```C
-	rc = afb_event_push(event, JSON);
-	if (rc == 0) {
-		stop_generating(event);
-		afb_event_drop(event);
-	}
-```
-
-The function ***afb\_event\_push*** pushes json data to all the
-subscribers. It then returns the count of subscribers. When the count is
-zero, there is no subscriber listening for the event. The example above
-shows that in that case, the signaling agent stops to generate data for
-the event and delete the event using afb\_event\_drop. This is one
-possible option. Other valuable options are: do nothing and continue to
-generate and push the event or just stop to generate and push the data
-but keep the event existing.
-
-### Receiving the signals
-
-Understanding what a client expects when it receives signals, events or
-data shall be the most important topic of the designer of a signaling
-agent. The good point here is that because JSON[^1] is the exchange
-format, structured data can be sent in a flexible way.
-
-The good design is to allow as much as possible the client to describe
-what is needed with the goal to optimize the processing to the
-requirements only.
-
-### The exceptional case of wide broadcast
-
-Some data or events have so much importance that they can be widely
-broadcasted to alert any listening client. Examples of such an alert
-are:
-
--   system is entering/leaving “power safe” mode
--   system is shutting down
--   the car starts/stops moving
--   ...
-
-An event can be broadcasted using one of the two following methods:
-***afb\_daemon\_broadcast\_event*** or
-***afb\_event\_broadcast***.
-
-Example 1:
-
-```C
-	afb_daemon_broadcast_event(afb_daemon, name, json);
-```
-
-Example 2:
-
-```C
-	event = afb_daemon_make_event(afb_daemon, name);
-	. . . .
-	afb_event_broadcast(event, json);
-```
-
-As for other events, the name of events broadcasted using
-***afb\_daemon\_broadcast\_event*** are automatically prefixed by
-the framework with API prefix of the binding (signaling agent).
-
-Reference of functions
-----------------------
-
-### Function afb\_event afb\_daemon\_make\_event
-
-The function ***afb\_daemon\_make\_event*** that is defined as below:
-
-```C
-/*
- * Creates an event of 'name' and returns it.
- * 'daemon' MUST be the daemon given in interface when activating the binding.
- */
-struct afb_event afb_daemon_make_event(struct afb_daemon daemon, const char *name);
-```
-
-The daemon is the handler to the application framework binder daemon
-received during initialisation steps of the binding.
-
-Calling the function ***afb\_daemon\_make\_event*** within the initialisation
-function ***afbBindingV1Register*** will _fail_ because the binding
-name is not known at this time.
-
-The correct way to create the event at initialisation is to call the function
-***afb\_daemon\_make\_event*** within the initialisation
-function ***afbBindingV1ServiceInit***.
-
-### Function afb\_event\_push
-
-The function ***afb\_event\_push*** is defined as below:
-
-```C
-/*
- * Pushes the 'event' with the data 'object' to its observers.
- * 'object' can be NULL.
- *
- * For convenience, the function calls 'json_object_put' for object'.
- * Thus, in the case where 'object' should remain available after
- * the function returns, the function 'json_object_get' shall be used.
- *
- * Returns the count of clients that received the event.
- */
-int afb_event_push(struct afb_event event, struct json_object *object);
-```
-
-As the function ***afb\_event\_push*** returns 0 when there is no
-more subscriber, a binding can remove such unexpected event using the
-function ***afb\_event\_drop***.
-
-### Function afb\_event\_drop
-
-The function ***afb\_event\_drop*** is defined as below:
-
-```C
-/*
- * Drops the data associated to the event
- * After calling this function, the event
- * MUST NOT BE USED ANYMORE.
- */
-void afb_event_drop(struct afb_event event);
-```
-
-### Function afb\_req\_subscribe
-
-The function ***afb\_req\_subscribe*** is defined as below:
-
-```C
-/*
- * Establishes for the client link identified by 'req' a subscription
- * to the 'event'.
- * Returns 0 in case of successful subscription or -1 in case of error.
- */
-int afb_req_subscribe(struct afb_req req, struct afb_event event);
-```
-
-The subscription adds the client of the request to the list of subscribers
-to the event.
-
-### Function afb\_req\_unsubscribe
-
-The function ***afb\_req\_unsubscribe*** is defined as
-below:
-
-```C
-/*
- * Revokes the subscription established to the 'event' for the client
- * link identified by 'req'.
- * Returns 0 in case of successful unsubscription or -1 in case of error.
- */
-int afb_req_unsubscribe(struct afb_req req, struct afb_event event);
-```
-
-The unsubscription removes the client of the request of the list of subscribers
-to the event.
-When the list of subscribers to the event becomes empty,
-the function ***afb\_event\_push*** will return zero.
-
-### Function afb\_event\_broadcast
-
-The function ***afb\_event\_broadcast*** is defined as below:
-
-```C
-/*
- * Broadcasts widely the 'event' with the data 'object'.
- * 'object' can be NULL.
- *
- * For convenience, the function calls 'json_object_put' for 'object'.
- * Thus, in the case where 'object' should remain available after
- * the function returns, the function 'json_object_get' shall be used.
- *
- * Returns the count of clients that received the event.
- */
-int afb_event_broadcast(struct afb_event event, struct json_object *object);
-```
-
-This uses an existing event (created with ***afb\_daemon\_make\_event***)
-for broadcasting an event having its name.
-
-
-### Function afb\_daemon\_broadcast\_event
-
-The function ***afb\_daemon\_broadcast\_event*** is defined as below:
-
-```C
-/*
- * Broadcasts widely the event of 'name' with the data 'object'.
- * 'object' can be NULL.
- * 'daemon' MUST be the daemon given in interface when activating the binding.
- *
- * For convenience, the function calls 'json_object_put' for 'object'.
- * Thus, in the case where 'object' should remain available after
- * the function returns, the function 'json_object_get' shall be used.
- *
- * Returns the count of clients that received the event.
- */
-int afb_daemon_broadcast_event(struct afb_daemon daemon, const char *name, struct json_object *object);
-```
-
-The name is given here explicitly. The name is automatically prefixed
-with the name of the binding. For example, a binding of prefix "xxx"
-would broadcat the event "xxx/name".
-
-### Function afbBindingV1ServiceEvent
-
-Binding can implement function **afbBindingV1ServiceEvent** which will
-be called when an event is broadcasted or if service subscribed to an event.
-That allow a service to react to an event and do what it is to do if this is
-relevant for it (ie: car back camera detects imminent collision and broadcast
-it, then appropriate service enable parking brake.). Here is the
-**afbBindingV1ServiceEvent** definition:
-
-```C
-/*
- * When a binding have an implementation of the function 'afbBindingV1ServiceEvent',
- * defined below, the framework calls that function for any broadcasted event or for
- * events that the service subscribed to in its name.
- *
- * It receive the 'event' name and its related data in 'object' (be aware that 'object'
- * might be NULL).
- */
-extern void afbBindingV1ServiceEvent(const char *event, struct json_object *object);
-
-The binding *tic-tac-toe* broadcasts events when the board changes.
-This is done in the function **changed**:
-```
-
-Architectural digressions
--------------------------
-
-Based on their dependencies to hardware, signaling agents can be split
-into 2 categories: low-level signaling agents and high-level signaling
-agents.
-
-Low-level signaling agents are bound to the hardware and focused on
-interfacing and driving.
-
-High-level signaling agent are independent of the hardware and focused on
-providing service.
-
-This separation (that may in the corner look artificial) aim to help in
-the systems design. The main idea here is that high-level signaling
-agents are providing “business logic”, also known as “application
-logic”, that is proper to the car industry and that can be reused and
-that can evolve as a foundation for the future of the industry.
-
-The implementation of this decomposition may follow 2 paths: strict
-separation or soft composition.
-
-### Strict separation
-
-The strict separation implements the modularity composition of signaling
-agent through the framework. The high-level signaling agent subscribes
-to the low level signaling agent using the standard client API.
-
-Advantages:
-
--   Modularity
--   Separation of responsibilities
--   Possible aggregation of multiple sources
--   Soft binding of agent good for maintenance
-
-Drawbacks:
-
--   Cost of propagation of data (might serialize)
--   Difficulties to abstract low-level signaling agent or to find a
-    trade-off between abstracting and specializing
-
-The key is modularity versus cost of propagation. It can be partly
-solved when logical group of signaling agent are launched together in
-the same binder process. In that particular case, the cost of
-propagation of data between agents is reduced[^2] because there is no
-serialization.
-
-This reduction of the propagation cost (and of the resources used)
-precludes implementation of strong security between the agents because
-they share the same memory.
-
-### Soft composition
-
-The soft composition implements the business logic of high-level
-signaling agents as libraries that can then be used directly by the low
-level signaling agents.
-
-Advantages:
-
--   No propagation: same memory, sharing of native structures
-
-Drawbacks:
-
--   Cannot be used for aggregation of several sources
--   Difficulties to abstract low-level signaling agent or to find a
-    trade-off between abstracting and specializing
--   Source code binding not good for maintenance
-
-[^1]: There are two aspect in using JSON: the first is the flexible data
-    structure that mixes common types (booleans, numbers, strings,
-    arrays, dictionaries, nulls), the second, is the streaming
-    specification. Streaming is often seen as the bottleneck of using
-    JSON (see http://bjson.org). When the agent share the same process,
-    there is no streaming at all.
-
-[^2]: Within the same process, there is not serialization, the
-    propagation has the cost of wrapping a json data and calling
-    callbacks with the benefit of having a powerful callback manager:
-    the event mechanism of the framework.
diff --git a/doc/afb-overview.md b/doc/afb-overview.md
deleted file mode 100644
index eec3f91a..00000000
--- a/doc/afb-overview.md
+++ /dev/null
@@ -1,315 +0,0 @@
-
-Overview of AFB-DAEMON
-======================
-
-Roles of afb-daemon
--------------------
-
-The name **afb-daemon** stands for *Application
-Framework Binder Daemon*. That is why afb-daemon
-is also named ***the binder***.
-
-**Afb-daemon** is in charge to bind one instance of
-an application to the AGL framework and AGL system.
-
-On the following figure, you can use a typical use
-of afb-daemon:
-
-<h4><a id="binder-fig-basis">Figure: binder afb-daemon, basis</a></h4>
-
-![binder-basis][binder-basis]
-
-The application and its companion binder run in secured and isolated
-environment set for them. Applications are intended to access to AGL
-system through the binder.
-
-The binder afb-daemon serves multiple purposes:
-
-1. It acts as a gateway for the application to access the system;
-
-2. It acts as an HTTP server for serving files to HTML5 applications;
-
-3. It allows HTML5 applications to have native extensions subject
-to security enforcement for accessing hardware resources or
-for speeding parts of algorithm.
-
-Use cases of the binder afb-daemon
-----------------------------------
-
-This section tries to give a better understanding of the binder
-usage through several use cases.
-
-### Remotely running application
-
-One of the most interesting aspect of using the binder afb-daemon
-is the ability to run applications remotely. This feature is
-possible because the binder afb-daemon implements native web
-protocols.
-
-So the [figure binder, basis](#binder-fig-basis) would become
-when the application is run remotely:
-
-<h4><a id="binder-fig-remote">Figure: binder afb-daemon and remotely running application</a></h4>
-
-
-### Adding native features to HTML5/QML applications
-
-Applications can provide with their packaged delivery a binding.
-That binding will be instantiated for each application instance.
-The methods of the binding will be accessible by applications and
-will be executed within the security context.
-
-### Offering services to the system
-
-It is possible to run the binder afb-daemon as a daemon that provides the
-API of its bindings.
-
-This will be used for:
-
-1. offering common APIs
-
-2. provide application's services (services provided as application)
-
-In that case, the figure showing the whole aspects is
-
-<h4><a id="binder-fig-remote">Figure: binder afb-daemon for services</a></h4>
-
-![afb-for-services][afb-for-services]
-
-For this case, the binder afb-daemon takes care to attribute one single session
-context to each client instance. It allows bindings to store and retrieve data
-associated to each of its client.
-
-The bindings of the binder afb-daemon
-------------------------------------
-
-The binder can instantiate bindings. The primary use of bindings
-is to add native methods that can be accessed by applications
-written with any language through web technologies ala JSON RPC.
-
-This simple idea is declined to serves multiple purposes:
-
-1. add native feature to applications
-
-2. add common API available by any applications
-
-3. provide customers services
-
-A specific document explains how to write an afb-daemon binder binding:
-[HOWTO WRITE a BINDING for AFB-DAEMON](afb-bindings-writing.html)
-
-
-Launching the binder afb-daemon
--------------------------------
-
-The launch options for binder **afb-daemon** are:
-
-	  --help
-
-		Prints help with available options
-
-	  --version
-
-		Display version and copyright
-
-	  --verbose
-
-		Increases the verbosity, can be repeated
-
-	  --quiet
-
-		Decreases the verbosity, can be repeated
-
-	  --port=xxxx
-
-		HTTP listening TCP port  [default 1234]
-
-	  --workdir=xxxx
-
-		Directory where the daemon must run [default: $PWD if defined
-		or the current working directory]
-
-	  --uploaddir=xxxx
-
-		Directory where uploaded files are temporarily stored [default: workdir]
-
-	  --rootdir=xxxx
-
-		Root directory of the application to serve [default: workdir]
-
-	  --roothttp=xxxx
-
-		Directory of HTTP served files. If not set, files are not served
-		but apis are still accessibles.
-
-	  --rootbase=xxxx
-
-		Angular Base Root URL [default /opa]
-
-		This is used for any application of kind OPA (one page application).
-		When set, any missing document whose url has the form /opa/zzz
-		is translated to /opa/#!zzz
-
-	  --rootapi=xxxx
-
-		HTML Root API URL [default /api]
-
-		The bindings are available within that url.
-
-	  --alias=xxxx
-
-		Maps a path located anywhere in the file system to the
-		a subdirectory. The syntax for mapping a PATH to the
-		subdirectory NAME is: --alias=/NAME:PATH.
-
-		Example: --alias=/icons:/usr/share/icons maps the
-		content of /usr/share/icons within the subpath /icons.
-
-		This option can be repeated.
-
-	  --no-httpd
-
-		Tells to not start the HTTP server.
-
-	  --apitimeout=xxxx
-
-		binding API timeout in seconds [default 20]
-
-		Defines how many seconds maximum a method is allowed to run.
-		0 means no limit.
-
-	  --cntxtimeout=xxxx
-
-		Client Session Timeout in seconds [default 3600]
-
-	  --cache-eol=xxxx
-
-		Client cache end of live [default 100000 that is 27,7 hours]
-
-	  --session-max=xxxx
-
-		Maximum count of simultaneous sessions [default 10]
-
-	  --ldpaths=xxxx
-
-		Load bindings from given paths separated by colons
-		as for dir1:dir2:binding1.so:... [default = $libdir/afb]
-
-		You can mix path to directories and to bindings.
-		The sub-directories of the given directories are searched
-		recursively.
-
-		The bindings are the files terminated by '.so' (the extension
-		so denotes shared object) that contain the public entry symbol.
-
-	  --binding=xxxx
-
-		Load the binding of given path.
-
-	  --token=xxxx
-
-		Initial Secret token to authenticate.
-
-		If not set, no client can authenticate.
-
-		If set to the empty string, then any initial token is accepted.
-
-	  --random-token
-
-		Generate a random starting token. See option --exec.
-
-	  --mode=xxxx
-
-		Set the mode: either local, remote or global.
-
-		The mode indicate if the application is run locally on the host
-		or remotely through network.
-
-	  --readyfd=xxxx
-
-		Set the #fd to signal when ready
-
-		If set, the binder afb-daemon will write "READY=1\n" on the file
-		descriptor whose number if given (/proc/self/fd/xxx).
-
-	  --dbus-client=xxxx
-
-		Transparent binding to a binder afb-daemon service through dbus.
-
-		It creates an API of name xxxx that is implemented remotely
-		and queried via DBUS.
-
-	  --dbus-server=xxxx
-
-		Provides a binder afb-daemon service through dbus.
-
-		The name xxxx must be the name of an API defined by a binding.
-		This API is exported through DBUS.
-
-	  --ws-client=xxxx
-
-		Transparent binding to a binder afb-daemon service through a WebSocket.
-
-		The value of xxxx is either a unix naming socket, of the form "unix:path/api",
-		or an internet socket, of the form "host:port/api".
-
-	  --ws-server=xxxx
-
-		Provides a binder afb-daemon service through WebSocket.
-
-		The value of xxxx is either a unix naming socket, of the form "unix:path/api",
-		or an internet socket, of the form "host:port/api".
-
-	  --foreground
-
-		Get all in foreground mode (default)
-
-	  --daemon
-
-		Get all in background mode
-
-	  --no-httpd
-
-		Forbids HTTP serve
-
-	  --exec
-
-		Must be the last option for afb-daemon. The remaining
-		arguments define a command that afb-daemon will launch.
-		The sequences @p, @t and @@ of the arguments are replaced
-		with the port, the token and @.
-
-	  --tracereq=xxxx
-
-		Trace the processing of requests in the log file.
-
-		Valid values are 'no' (default), 'common', 'extra' or 'all'.
-
-
-
-
-
-Future development of afb-daemon
---------------------------------
-
-- The binder afb-daemon would launch the applications directly.
-
-- The current setting of mode (local/remote/global) might be reworked to a
-mechanism for querying configuration variables.
-
-- Implements "one-shot" initial token. It means that after its first
-authenticated use, the initial token is removed and no client can connect
-anymore.
-
-- Creates some intrinsic APIs.
-
-- Make the service connection using WebSocket not DBUS.
-
-- Management of targeted events.
-
-- Securing LOA.
-
-- Integration of the protocol JSON-RPC for the websockets.
-
-[binder-basis]: pictures/AFB_overview.svg
-[afb-for-services]: pictures/AFB_for_services.svg
diff --git a/doc/afb-tests-overview.md b/doc/afb-tests-overview.md
deleted file mode 100644
index d6f619fe..00000000
--- a/doc/afb-tests-overview.md
+++ /dev/null
@@ -1,89 +0,0 @@
-
-Overview of tests shipped with AFB-Daemon
-=========================================
-
-List of tests
--------------
-
-Here are the tests shipped in the source tree:
-
-* **afb-client-demo** (command-line WebSockets)
-
-* **token-websock.qml** (Qt/QML WebSockets)
-
-* ***.html** (HTML5/JS HTTP-REST & WebSockets)
-
-
-Detail of tests
----------------
-
-### afb-client-demo (command-line WebSockets)
-
-This clients interactively calls bindings APIs from the command line, using the binder
-[WebSockets](https://en.wikipedia.org/wiki/WebSocket) facility.
-
-If _afb-daemon_ has been launched with the following parameters:
-
-
-    $ afb-daemon --port=1234 --token=123456 [...]
-
-
-Then run the client with :
-
-    afb-client-demo ws://localhost:1234/api?token=123456 [<api> <verb> [<json-data>]]
-
-For instance, to initialize the Audio binding from the command line :
-
-    afb-client-demo ws://localhost:1234/api?token=123456
-
-The command doesn't return. You should type requests of type <api> <verb> [<json-data>].
-So, try:
-
-    auth connect
-    hello pingjson true
-
-<br />
-
-
-
-### token-websock.qml (Qt/QML WebSockets)
-
-If _afb-daemon_ has been launched with the following parameters:
-
-    $ afb-daemon --port=1234 --token=123456 [...]
-
-and Qt5 is installed.
-
-For installing Qt5 on **Ubuntu 16.04**:
-
-    $ apt-get install qmlscene qml-module-qtwebsockets qml-module-qtquick-controls
-
-For installing Qt5 on **Fedora >= 22** :
-
-    $ dnf install qt5-qtdeclarative-devel qt5-qtwebsockets-devel qt5-qtquickcontrols
-
-
-Then run the client with :
-
-    qmlscene test/token-websock.qml
-
-and interactively press the buttons, "Connect", "Refresh", "Logout".
-
-<br />
-
-
-### *.html (HTML5/JS HTTP-REST & WebSockets)
-
-If _afb-daemon_ has been launched with the following parameters:
-
-    $ afb-daemon --port=1234 --rootdir=$PWD/test [...]
-
-_("$PWD/test_" being the "test" subdirectory of the source tree)_
-
-
-Then open your preferred Web browser, connect to the following URL:
-
-    http://localhost:1234
-
-and interactively run the various tests.
-
diff --git a/doc/index.md b/doc/index.md
deleted file mode 120000
index 81c25433..00000000
--- a/doc/index.md
+++ /dev/null
@@ -1 +0,0 @@
-afb-overview.md
\ No newline at end of file
diff --git a/doc/pictures/AFB_for_services.svg b/doc/pictures/AFB_for_services.svg
deleted file mode 100644
index 6e536c50..00000000
--- a/doc/pictures/AFB_for_services.svg
+++ /dev/null
@@ -1,238 +0,0 @@
-<?xml version="1.0" encoding="UTF-8"?>
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