MQTT feature support in Azure IoT MQ Preview
Important
Azure IoT Operations Preview – enabled by Azure Arc is currently in PREVIEW. You shouldn't use this preview software in production environments.
See the Supplemental Terms of Use for Microsoft Azure Previews for legal terms that apply to Azure features that are in beta, preview, or otherwise not yet released into general availability.
Azure IoT MQ Preview currently supports the following MQTT features and control packets.
| Feature or control packet | MQTT v3.1.1 | MQTT v5 |
|---|---|---|
| CONNECT Keep-Alive | Supported | Supported |
| CONNECT Will Messages | Supported | Supported |
| CONNECT Clean Start | Supported | |
| CONNECT Persistent session | Supported | |
| CONNECT Session Expiry Interval | Supported | |
| CONNECT Receive Maximum | Supported | |
| CONNECT Maximum Packet Size | ||
| CONNECT Topic Alias Maximum | ||
| CONNECT Request Response Information | ||
| CONNECT User Properties | Supported | |
| CONNECT Authentication Data | ||
| CONNECT Authentication Method | ||
| CONNECT Session Present flag (Persistent session) | Supported | Supported |
| CONNECT Server Generated Client ID | Supported | Supported |
| AUTH | ||
| PUBLISH QoS0 Delivery | Supported | Supported |
| PUBLISH QoS1 Delivery | Supported | Supported |
| PUBLISH QoS0 Offline messages for persistent sessions | Supported | Supported |
| PUBLISH QoS1 Offline messages for persistent sessions | Supported | Supported |
| PUBLISH QoS1 Flow control Currently, the broker sends out as many publishes as possible without waiting for the client to acknowledge them. |
Supported | Supported |
| PUBLISH QoS1 Message delivery retry | Supported | Supported |
| PUBLISH QoS0 Retain | Supported | Supported |
| PUBLISH QoS1 Retain | Supported | Supported |
| PUBLISH Correlation Data | Supported | |
| PUBLISH Response Topic | Supported | |
| PUBLISH Payload Format Indicator | Supported | |
| PUBLISH Message Expiry Interval | Supported | |
| PUBLISH Topic Alias | ||
| PUBLISH User Properties | Supported | |
| SUBSCRIBE | Supported | Supported |
| SUBSCRIBE Retain as Published | Supported | |
| SUBSCRIBE Retain Handling | Supported | |
| SUBSCRIBE Wildcards | Supported | Supported |
| SUBSCRIBE No Local | ||
| UNSUBSCRIBE | Supported | Supported |
| SUBSCRIBE $SYS topics | ||
| SUBSCRIBE Subscription Identifiers | ||
| SUBSCRIBE Shared Subscriptions | Supported | Supported |
| SUBSCRIBE Max subscriptions per client | ||
| PINGREQ | Supported | Supported |
| DISCONNECT | Supported | Supported |
| DISCONNECT Session Expiry Interval |
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