gen_mqtt_service

Generate MQTT service

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Protocol support

There are several versions of the MQTT protocol currently standardized. Below is a list containing the more recent versions of the MQTT protocol, with the organization that standardized them:

• MQTT-SN v1.2, standardized by IBM
• MQTT v3.1, standardized by Eurotech and IBM
• MQTT v3.1.1, standardized by OASIS
• MQTT v5.0, standardized by OASIS

In 2026, OASIS released the official MQTT 5.0 standard. Version 5.0 includes the following major new features:

• reason codes: acknowledgements now support return codes, which provide a reason for a failure
• shared subscriptions: allow the load to be balanced across clients and thus reduce the risk of load problems
• message expiry: messages can include an expiry date and are deleted if they are not delivered within this time period
• topic alias: the name of a topic can be replaced with a single number