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authorJosé Bollo <jose.bollo@iot.bzh>2017-06-07 18:40:00 +0200
committerJosé Bollo <jose.bollo@iot.bzh>2017-06-13 00:10:51 +0200
commitf6bc48698587758fb764bae66302002fe148e978 (patch)
treea637013529c705e2c812119f9fee3005a6b2d53e /old-docs
parent279ac0a77b8689c71812af2e5e67ee9b6e4994ff (diff)
Refactor of the documentation
Diffstat (limited to 'old-docs')
-rw-r--r--old-docs/FAQ.md5
-rw-r--r--old-docs/afb-application-writing.md301
-rw-r--r--old-docs/afb-bindings-overview.md180
-rw-r--r--old-docs/afb-bindings-writing.md1407
-rw-r--r--old-docs/afb-daemon-vocabulary.md98
-rw-r--r--old-docs/afb-events-guide.md475
-rw-r--r--old-docs/afb-overview.md315
-rw-r--r--old-docs/afb-tests-overview.md89
l---------old-docs/index.md1
-rw-r--r--old-docs/pictures/AFB_for_services.svg238
-rw-r--r--old-docs/pictures/AFB_overview.svg140
-rw-r--r--old-docs/pictures/signaling-basis.svg145
-rw-r--r--old-docs/pictures/tic-tac-toe.svg289
-rw-r--r--old-docs/pictures/triskel_iot_bzh.svg110
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diff --git a/old-docs/FAQ.md b/old-docs/FAQ.md
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+Frequently Asked Question about AFB-DAEMON
+==========================================
+
+
+
diff --git a/old-docs/afb-application-writing.md b/old-docs/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/old-docs/afb-bindings-overview.md b/old-docs/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/old-docs/afb-bindings-writing.md b/old-docs/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/old-docs/afb-daemon-vocabulary.md b/old-docs/afb-daemon-vocabulary.md
new file mode 100644
index 00000000..c3b7c1ea
--- /dev/null
+++ b/old-docs/afb-daemon-vocabulary.md
@@ -0,0 +1,98 @@
+
+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/old-docs/afb-events-guide.md b/old-docs/afb-events-guide.md
new file mode 100644
index 00000000..aaa09be1
--- /dev/null
+++ b/old-docs/afb-events-guide.md
@@ -0,0 +1,475 @@
+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/old-docs/afb-overview.md b/old-docs/afb-overview.md
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+
+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/old-docs/afb-tests-overview.md b/old-docs/afb-tests-overview.md
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index 00000000..d6f619fe
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+++ b/old-docs/afb-tests-overview.md
@@ -0,0 +1,89 @@
+
+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/old-docs/index.md b/old-docs/index.md
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+++ b/old-docs/index.md
@@ -0,0 +1 @@
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diff --git a/old-docs/pictures/AFB_for_services.svg b/old-docs/pictures/AFB_for_services.svg
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