Channels

Channel is a component which connects and enables exchange of verbal as well as other conversation related data between conversation-capable client software to the Flowstorm NLP pipeline.

Flowstorm provides set of channel implementation in order to support integration of various client software (web and mobile apps, phone calls, voice asisstants and even other various conversation mediating systems).
There are two basic types of channel implementations
1.External API implementations used to provide endpoint for existing 3rd party conversation/verbal communication systems like IVA (Intelligent Voice Assistant) platforms or IVR (Interactive Voice Response) systems, including
​Amazon Alexa REST​
​Google Assistant REST​
​Twilio Stream Socket​
2.Flowstorm Channel API implementations leveraged by Flowstorm client apps and libraries as well as specific client implementations (e.g. web, mobile or 3D/VR apps)  
​Flowstorm Socket V1 and 
​Flowstorm Socket V2 
Flowstorm Channel Events
Flowstorm Channel API socket implementations leverage set of events declared in platform independent module channel/api so that they can be used on both client and server side
Name
Protocol Version
Emittor
Purpose
InputEvent
V1, V2
Client
Input object passed from client to server (e.g. when user is using text input OR ASR is being done on the client side). As soon as this event is emitted client should go to Processing state.
RequestEvent
V1 only, obsolete
Client 
Transport of obsolete request object from client to the server
InputAudioStreamOpenEvent
V1 only
Client
Indicates beginning of the input audio stream
InputStreamCloseEvent
V2 only
Client
Used to indicate end of input stream when client user switches to  text input
InputAudioStreamCloseEvent
V1 only
Client
Indicates end of the input audio stream if client has received finally recognized input OR client user has switched to the text input
RecognizedInputEvent
V2 only
Server
Used to pass client interim or final input object recognized from input stream
RecognizedEvent
V1 only
Server
Used to pass client interim or final input text recognized from input audio stream
ResponseItemEvent
V1, V2
Server
Response item can contain text and/or audio, video or command code (payload) to be interpreted by the client immediately.
ResponseItem
V1, V2
Server
Indicates completion of the response (and optionally end of session). Client should go to and stay in the Responding state until it has finished all response item processing, then go to Listening state) or go to sleep (Sleeping state) depending on whether session has ended or not.
InitEvent
V1 only
Client
Used to initiate connection to the server
ReadyEvent
V1 only
Server
Acknowledge of initiated connection from the server
ErrorEvent
V1, V2
Server
Non-recoverable server error text and source name. Client should display or otherwise indicate (e.g. by prerecorded voice message) server error and end session instantly by going to the Sleeping or Failed state.
SessionStartEvent
V1 only
Server
Acknowledge of  new session start (transport of session ID; V2 socket is using cookie for that)
SessionEndEvent
V1 only
Server
Indication of session end (client should discard session ID; obsolete, replaced with sessionEnded property of Response object transported via ResponseEvent)
LogEvent
V1, V2
Client
Used to transport client's log entries to the server where they are stored to the current session
BinaryEvent
V2 only
Client
Server potentially in the future
Used to transport block of audio/video data from client to the server
​

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Channel Events

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Flowstorm Channel Events