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MQTT Version 5 Features

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Christian edited this page Aug 14, 2022 · 2 revisions

MQTTnet supports MQTT V5 Packets. Feature support is not 100 % yet and is being extended from time to time. The following tables shows which feature is already available for MQTTnet clients and servers. Features which are not listed here are not officially supported.

Feature Client Server Library version
Connection Features
Assigned Client ID Supported Supported 3.1.0 +
Empty User Name Can be omitted when connecting. Supported 3.1.0 +
Server reference Can be read from connect result but no auto redirect. Supported 3.1.0 +
Publish Features
Topic Alias Can be set when publishing. Supported 3.1.0 +
Subscribe Features
No Local Can be set in MqttTopicFilterBuilder. Supported 3.1.0 +
Retain As Published Can be set in MqttTopicFilterBuilder. Supported 3.1.0 +
Retain Handling Can be set in MqttTopicFilterBuilder. Supported 3.1.0 +
Shared Subscriptions Not supported Not supported -
Subscription Identifiers Can be set when subscribing. Supported 3.1.0 +
Wildcard Subscription Available Can be set when subscribing. Supported 3.1.0 +
Server Features
$SYS Not supported Not supported -

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