Adding Intent Message requirements

requirements/specifications/intents/index.md

@@ -7,6 +7,8 @@ See [Firebolt Requirements Governance](../../governance.md) for more info.
 | Contributor     | Organization |
 | --------------- | ------------ |
 | Jeremy LaCivita | Comcast      |
+| Simon Grist     | Sky          |
+
 
 ## 1. Overview
 Offen times an end-user has a specific intention that needs to be communicated 
@@ -27,18 +29,23 @@ additional `data` property.
 - [3. Intent Action](#3-intent-action)
 - [4. Intent Context](#4-intent-context)
 - [5. Intent Data](#5-intent-data)
-- [Intent Types](#intent-types)
+- [6. Intent Message](#6-intent-message)
+  - [6.1. App Intent Message](#61-app-intent-message)
+  - [6.2. Platform Intent Message](#62-platform-intent-message)
+  - [6.3. Intent Message Type](#63-intent-message-type)
+  - [6.4. Intent Message Metadata](#64-intent-message-metadata)
+- [7. Intent Types](#7-intent-types)
 
 ## 3. Intent Action
 The intent `action` denotes what type of intent it is. 
 
-All intents **MUST** have a `string` attribute denoting the type of intent. 
+All intents **MUST** have an `action` `string` property denoting the type of intent. 
 
 See the various [Intent Types](#intent-types) below for values. 
 
 ## 4. Intent Context
-The intent `context` provides information on where the intent orginated from. 
 
+The intent `context` provides information on where the intent orginated from. 
 All intents **MUST** have a `context` property, which is an object. 
 
 The `context` object **MUST** have a `source` string property with one of the 
@@ -56,7 +63,28 @@ any string value. This property denotes an editorial campaign.
 ## 5. Intent Data
 If an intent has any additional data, it **MUST** be in the `data` property. 
 
-## Intent Types
+## 6. Intent Message
+When an intent is sent to a Firebolt device from some other system, e.g. a cloud voice service, it **MUST** be wrapped in an `IntentMessage` object so that it can be properly routed after transport.
+
+An intent message **MUST** have an `intent` object property that is the intent being passed.
+
+### 6.1. App Intent Message
+If an intent is targeting a specific app, then the intent message **MUST** have an `appId` string property with the appId of the targeted app.
+
+### 6.2. Platform Intent Message
+If an intent messagage does not have an `appId` property, then it **MUST** be targeting the device itself, e.g. a `power` intent to turn off the device.
+
+### 6.3. Intent Message Type
+An intent message **SHOULD** have a `type` string property for categorizing the intent.
+
+Platforms may use this to route different types of intents to different subsystems.
+
+**TODO**: this was not spec'd out ver well... need to discuss.
+
+### 6.4. Intent Message Metadata
+An intent message **MAY** have a `metadata` object property for adding distributor-specific metadata for logging or analytics. The values in `metadata` **MUST NOT** impact how the device interprets the intent.
+
+## 7. Intent Types
 
 - [Play](./play.md)
 - [Tune](./tune.md)