2018-11-29 22:54:25 +00:00
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<!--
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.. title: MQTT 5 progress
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.. slug: mqtt5-progress
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.. date: 2018-11-29 21:33:29 UTC+00:00
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.. tags: MQTT5
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2021-10-05 14:20:37 +00:00
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.. category:
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.. link:
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.. description:
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2018-11-29 22:54:25 +00:00
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.. type: text
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-->
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Development of support for MQTT 5 is ongoing and making good progress, but has
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been substantially delayed due to other non-Mosquitto work having to take
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priority.
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It is possible to test the current state of MQTT 5 support by using the `mqtt5`
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branch of the [repository]. Please note that this is very much a work in
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progress, so parts are incomplete and interfaces may yet change. The client
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library in particular has had to have an increase in functions available in
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order to provide the features needed whilst providing backwards compatibility.
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Part of the plan for the 2.0 release, which will follow after 1.6, is to
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consolidate the libmosquitto API with breaking changes. There are more details
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on the [roadmap].
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Current features include:
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* Support for all incoming and outgoing packets, although not everything is
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processed.
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* Support for sending and receiving all properties, with not all properties
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processed.
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* Client support for setting properties
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* Request/response support (client cannot process incoming correlation data)
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* Retain availability
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* Message expiry interval support
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* Server support for assigned client identifiers
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* Payload format indicator support
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* Content-type support
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* Basic topic alias support from client to broker
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* Lots of new tests
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Both `mosquitto_pub` and `mosquitto_sub` support setting properties on the
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command line, for example:
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```
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mosquitto_sub -t topic -v -D connect session-expiry-interval 60 -D connect user-property key value -D subscribe user-property sub-key sub-value
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```
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```
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mosquitto_pub -t topic -m '{"key":"value"}' -D publish content-type "application/json"
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```
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```
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./sensor_read.sh | mosquitto_pub -t topic -l -D publish topic-alias 1
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```
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Further updates will be posted when more features are available.
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[repository]: https://github.com/eclipse/mosquitto/tree/mqtt5
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2021-10-05 14:20:37 +00:00
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[roadmap]: https://mosquitto.org/roadmap/
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