Merge pull request #261009 from PatAltimore/patricka-mqtt-support

Add MQTT support reference table

Author: v-dirichards

articles/iot-operations/reference/mqtt-support.md

@@ -0,0 +1,63 @@
+---
+title: MQTT feature support in Azure IoT MQ
+titleSuffix: Azure IoT MQ
+description: MQTT feature and control support in Azure IoT MQ.
+author: PatAltimore
+ms.author: patricka
+ms.subservice: mq
+ms.topic: reference
+ms.date: 12/12/2023
+
+# CustomerIntent: As an operator, I want to understand what MQTT specifications are supported by Azure IoT MQ so that I can configure my MQTT client to connect to Azure IoT MQ.
+---
+
+# MQTT feature support in Azure IoT MQ
+
+[!INCLUDE [public-preview-note](../includes/public-preview-note.md)]
+
+Azure IoT MQ 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 <br> 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 | | |

articles/iot-operations/toc.yml

@@ -235,4 +235,5 @@ items:
           href: reference/observability-metrics-opcua-broker.md
         - name: Azure IoT Layered Network Management
           href: reference/observability-metrics-layered-network.md
-
+      - name: MQTT support
+        href: reference/mqtt-support.md