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MQTT broker 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 Will Messages Delay | N/A | Supported |
| CONNECT Will Messages Expiry Interval | N/A | Supported |
| CONNECT Will Messages User Properties | N/A | Supported |
| CONNECT Clean Start | Supported | Supported |
| CONNECT Persistent session | Supported | Supported |
| CONNECT Session Expiry Interval | N/A | Supported |
| CONNECT Client Receive Maximum | N/A | Supported |
| CONNECT Client Maximum Packet Size | N/A | Not Supported |
| CONNECT Topic Alias Maximum | N/A | Not Supported |
| CONNECT Request Response Information | N/A | Not Supported |
| CONNECT User Properties | N/A | Supported |
| CONNECT Authentication Data | N/A | Supported |
| CONNECT Authentication Method | N/A | Supported |
| CONNECT Server Generated Client ID | N/A | Supported |
| CONNACK Session Present | Supported | Supported |
| CONNACK Server Maximum Packet Size (Server sets maximum allowed incoming packet size based on the memory profile) |
N/A | Supported |
| AUTH | N/A | Supported |
| PUBLISH QoS0 Delivery | Supported | Supported |
| PUBLISH QoS1 Delivery | Supported | Supported |
| PUBLISH QoS2 Delivery | Not Supported | Not Supported |
| PUBLISH QoS0 Offline messages for persistent sessions (QoS0 messages are dropped for offline sessions) |
Not Supported | Not Supported |
| PUBLISH QoS1 Offline messages for persistent sessions | Supported | Supported |
| PUBLISH QoS1 Flow control (The broker sends out as many publishes as possible without waiting up to the client's Receive Maximum) |
N/A | Supported |
| PUBLISH Retain flag | Supported | Supported |
| PUBLISH Correlation Data | N/A | Supported |
| PUBLISH Response Topic | N/A | Supported |
| PUBLISH Payload Format Indicator | N/A | Supported |
| PUBLISH Message Expiry Interval | N/A | Supported |
| PUBLISH Topic Alias | N/A | Not Supported |
| PUBLISH User Properties | N/A | Supported |
| SUBSCRIBE | Supported | Supported |
| SUBSCRIBE Retain as Published | N/A | Supported |
| SUBSCRIBE Retain Handling | N/A | Supported |
| SUBSCRIBE Wildcards | Supported | Supported |
| SUBSCRIBE No Local | N/A | Supported |
| UNSUBSCRIBE | Supported | Supported |
| SUBSCRIBE $SYS topics | Not Supported | Not Supported |
| SUBSCRIBE Subscription Identifiers | N/A | Not Supported |
| SUBSCRIBE Shared Subscriptions | Supported | Supported |
| SUBSCRIBE Max subscriptions per client | Not Supported | Not Supported |
| PINGREQ | Supported | Supported |
| DISCONNECT | Supported | Supported |
| DISCONNECT Session Expiry Interval | N/A | Supported |