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# Overview of plugins shipped with AFB-Daemon
Version: 1
Date: 30 May 2016
Author: Manuel Bachmann
## List of plugins
Here are the plugins 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 plugins may not be built, depending on the development libraries present on the system at build time.
## Detail of plugins
### Hello World
A sample Hello World plugin for demonstration and learning purposes.
This plugin 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
An sample Authentication plugin for demonstration purposes.
This plugin 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 plugin.
This plugin 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 plugin with 2 backends:
* ALSA (mandatory)
* PulseAudio (optional)
This plugin 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 plugin 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 plugin with 1 backend:
* RTLSDR - Realtek RTL2832U dongles (mandatory)
This plugin is able to initialize specific RTL2832U dongles, switch between AM/FM modes, define frequency, mute sound, and play sound (if combining with the **audio** plugin).
**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 plugin will not be built)_
<br />
### Media
A sample Media Server plugin with 1 backend:
* Rygel
This plugin 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 fund at build time, this plugin will not be built)_
<br />
---
<br />
Sample command-line applications: _afb-client-demo_ (built by default)
Sample HTML5 applications: **test/*.html**, **[afb-client](https://github.com/iotbzh/afb-client)**, **[afb-radio](https://github.com/iotbzh/afb-radio)**
Sample Qt/QML applications: *test/token-websock.qml*
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