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chore: merge 'master' into 'next-major-spec'
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jonaslagoni committed Dec 4, 2023
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130 changes: 100 additions & 30 deletions mqtt/README.md
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This document defines how to describe MQTT-specific information on AsyncAPI.

It applies to all versions of MQTT, although specific binding fields may only apply to particular versions.

<a name="version"></a>

## Version
Expand All @@ -17,21 +19,23 @@ This object contains information about the server representation in MQTT.

##### Fixed Fields

Field Name | Type | Description
---|:---:|---
<a name="serverBindingObjectClientId"></a>`clientId` | string | The client identifier.
<a name="serverBindingObjectCleanSession"></a>`cleanSession` | boolean | Whether to create a persistent connection or not. When `false`, the connection will be persistent.
<a name="serverBindingObjectLastWill"></a>`lastWill` | object | Last Will and Testament configuration.
<a name="serverBindingObjectLastWillTopic"></a>`lastWill.topic` | string | The topic where the Last Will and Testament message will be sent.
<a name="serverBindingObjectLastWillQoS"></a>`lastWill.qos` | integer | Defines how hard the broker/client will try to ensure that the Last Will and Testament message is received. Its value MUST be either 0, 1 or 2.
<a name="serverBindingObjectLastWillMessage"></a>`lastWill.message` | string | Last Will message.
<a name="serverBindingObjectLastWillRetain"></a>`lastWill.retain` | boolean | Whether the broker should retain the Last Will and Testament message or not.
<a name="serverBindingObjectKeepAlive"></a>`keepAlive` | integer | Interval in seconds of the longest period of time the broker and the client can endure without sending a message.
<a name="serverBindingObjectBindingVersion"></a>`bindingVersion` | string | The version of this binding. If omitted, "latest" MUST be assumed.
Field Name | Type | MQTT Versions | Description
---|:---:|:---:|---|
<a name="serverBindingObjectClientId"></a>`clientId` | string | 3, 5 | The client identifier.
<a name="serverBindingObjectCleanSession"></a>`cleanSession` | boolean | 3, 5 | Whether to create a persistent connection or not. When `false`, the connection will be persistent. This is called **clean start** in MQTTv5.
<a name="serverBindingObjectLastWill"></a>`lastWill` | object | 3, 5 | Last Will and Testament configuration. `topic`, `qos`, `message` and `retain` are properties of this object as shown below.
<a name="serverBindingObjectLastWillTopic"></a>`lastWill.topic` | string | 3, 5 | The topic where the Last Will and Testament message will be sent.
<a name="serverBindingObjectLastWillQoS"></a>`lastWill.qos` | integer | 3, 5 | Defines how hard the broker/client will try to ensure that the Last Will and Testament message is received. Its value MUST be either 0, 1 or 2.
<a name="serverBindingObjectLastWillMessage"></a>`lastWill.message` | string | 3, 5 | Last Will message.
<a name="serverBindingObjectLastWillRetain"></a>`lastWill.retain` | boolean | 3, 5 | Whether the broker should retain the Last Will and Testament message or not.
<a name="serverBindingObjectKeepAlive"></a>`keepAlive` | integer | 3, 5 | Interval in seconds of the longest period of time the broker and the client can endure without sending a message.
<a name="serverBindingObjectSessionExpiryInterval"></a>`sessionExpiryInterval` | integer \| [Schema Object][schemaObject] \| [Reference Object](referenceObject) | 5 | Interval in seconds or a *Schema Object* containing the definition of the interval. The broker maintains a session for a disconnected client until this interval expires.
<a name="serverBindingObjectMaximumPacketSize"></a>`maximumPacketSize` | integer \| [Schema Object][schemaObject] \| [Reference Object](referenceObject) | 5 | Number of bytes or a *Schema Object* representing the maximum packet size the client is willing to accept.
<a name="serverBindingObjectBindingVersion"></a>`bindingVersion` | string | | The version of this binding. If omitted, "latest" MUST be assumed. |

This object MUST contain only the properties defined above.

##### Example
##### Examples

```yaml
servers:
Expand All @@ -46,6 +50,22 @@ servers:
message: Guest gone offline.
retain: false
keepAlive: 60
sessionExpiryInterval: 600
maximumPacketSize: 1200
bindingVersion: 0.2.0
```
```yaml
servers:
production:
bindings:
mqtt:
sessionExpiryInterval:
type: integer
minimum: 30
maximum: 1200
maximumPacketSize:
type: integer
minimum: 256
bindingVersion: 0.2.0
```
Expand All @@ -63,29 +83,49 @@ This object contains information about the operation representation in MQTT.
##### Fixed Fields
Field Name | Type | Applies To Action | Description
---|:---:|:---:|---
<a name="operationBindingObjectQoS"></a>`qos` | integer | `receive`, `send` | Defines the Quality of Service (QoS) levels for the message flow between client and server. Its value MUST be either 0 (At most once delivery), 1 (At least once delivery), or 2 (Exactly once delivery).
<a name="operationBindingObjectRetain"></a>`retain` | boolean | `receive`, `send` | Whether the broker should retain the message or not.
<a name="operationBindingObjectBindingVersion"></a>`bindingVersion` | string | `receive`, `send` | The version of this binding. If omitted, "latest" MUST be assumed.
Field Name | Type | Applies To | MQTT Versions | Description
---|:---:|:---:|:---:|---
<a name="operationBindingObjectQoS"></a>`qos` | integer | Publish, Subscribe | 3, 5 | Defines the Quality of Service (QoS) levels for the message flow between client and server. Its value MUST be either 0 (At most once delivery), 1 (At least once delivery), or 2 (Exactly once delivery).
<a name="operationBindingObjectRetain"></a>`retain` | boolean | Publish | 3, 5 | Whether the broker should retain the message or not.
<a name="operationBindingObjectMessageExpiryInterval"></a>`messageExpiryInterval` | integer \| [Schema Object][schemaObject] \| [Reference Object](referenceObject)| Publish | 5 | Interval in seconds or a *Schema Object* containing the definition of the lifetime of the message.
<a name="operationBindingObjectBindingVersion"></a>`bindingVersion` | string | | | The version of this binding. If omitted, "latest" MUST be assumed.

This object MUST contain only the properties defined above.

##### Example
##### Examples

```yaml
channels:
user/signup:
operations:
userSignup:
action: receive
bindings:
mqtt:
qos: 2
retain: true
bindingVersion: 0.2.0
publish:
bindings:
mqtt:
qos: 2
retain: true
messageExpiryInterval: 60
bindingVersion: 0.2.0
```
```yaml
channels:
user/signup:
publish:
bindings:
mqtt:
messageExpiryInterval:
type: integer
minimum: 30
maximum: 300
bindingVersion: 0.2.0
```
```yaml
channels:
user/signup:
subscribe:
bindings:
mqtt:
qos: 2
bindingVersion: 0.2.0
```


<a name="message"></a>

Expand All @@ -95,12 +135,31 @@ This object contains information about the message representation in MQTT.

##### Fixed Fields

Field Name | Type | Description
---|:---:|---
<a name="messageBindingObjectBindingVersion"></a>`bindingVersion` | string | The version of this binding. If omitted, "latest" MUST be assumed.
Field Name | Type | MQTT Versions | Description
---|:---:|:---:|---
<a name="messageBindingObjectPayloadFormatIndicator"></a>`payloadFormatIndicator` | integer | 5 | Either: **0** (zero): Indicates that the payload is unspecified bytes, or **1**: Indicates that the payload is UTF-8 encoded character data. |
<a name="messageBindingObjectCorrelationData"></a>`correlationData` | [Schema Object][schemaObject] \| [Reference Object](referenceObject) | 5 | Correlation Data is used by the sender of the request message to identify which request the response message is for when it is received.
<a name="messageBindingObjectContentType"></a>`contentType` | string | 5 | String describing the content type of the message payload. This should not conflict with the `contentType` field of the associated AsyncAPI Message object.
<a name="messageBindingObjectResponseTopic"></a>`responseTopic` | URI string \| [Schema Object][schemaObject] \| [Reference Object](referenceObject) | 5 | The topic (channel URI) for a response message.
<a name="messageBindingObjectBindingVersion"></a>`bindingVersion` | string | | The version of this binding. If omitted, "latest" MUST be assumed.

This object MUST contain only the properties defined above.

##### Examples

```yaml
channels:
user/signup:
subscribe:
message:
bindings:
mqtt:
contentType: "application/json"
correlationData:
type: string
format: uuid
bindingVersion: 0.2.0
```
```yaml
channels:
userSignup:
Expand All @@ -109,5 +168,16 @@ channels:
userSignup:
bindings:
mqtt:
payloadFormatIndicator: 1
contentType: "application/json"
correlationData:
type: string
format: uuid
responseTopic:
type: string
pattern: "response/client/([a-z1-9]+)"
bindingVersion: 0.2.0
```

[schemaObject]: https://github.com/asyncapi/spec/blob/master/spec/asyncapi.md#schemaObject
[referenceObject]: https://github.com/asyncapi/spec/blob/master/spec/asyncapi.md#referenceObject
2 changes: 2 additions & 0 deletions mqtt5/README.md
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This document defines how to describe MQTT 5-specific information on AsyncAPI.

# **Deprecation Warning**: MQTT version 5 specific bindings are deprecated in favor of [MQTT bindings](../mqtt/README.md) that are not version specific.

<a name="version"></a>

## Version
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