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+---
+labels:
+- 'Stage-Beta'
+summary: 'MQTT interface to Prosody''s pubsub'
+...
+
+Introduction
+------------
+
+[MQTT](http://mqtt.org/) is a lightweight binary pubsub protocol suited
+to embedded devices. This module provides a way for MQTT clients to
+connect to Prosody and publish or subscribe to local pubsub nodes.
+
+Details
+-------
+
+MQTT has the concept of 'topics' (similar to XMPP's pubsub 'nodes').
+mod\_pubsub\_mqtt maps pubsub nodes to MQTT topics of the form
+`HOST/NODE', e.g.`pubsub.example.org/mynode\`.
+
+### Limitations
+
+The current implementation is quite basic, and in particular:
+
+-   Authentication is not supported
+-   SSL/TLS is not supported
+-   Only QoS level 0 is supported
+
+### Payloads
+
+XMPP payloads are always XML, but MQTT does not define a payload format.
+Therefore mod\_pubsub\_mqtt will attempt to convert data of certain
+recognised payload types. Currently supported:
+
+-   JSON (see [XEP-0335](http://xmpp.org/extensions/xep-0335.html) for
+    the format)
+-   Plain UTF-8 text (wrapped inside
+    `<data xmlns="https://prosody.im/protocol/mqtt"/>`)
+
+All other XMPP payload types are sent to the client directly as XML.
+Data published by MQTT clients is currently never translated, and always
+treated as UTF-8 text.
+
+Configuration
+-------------
+
+There is no special configuration for this module. Simply load it on
+your pubsub host like so:
+
+    Component "pubsub.example.org" "pubsub"
+        modules_enabled = { "pubsub_mqtt" }
+
+You may also configure which port(s) mod\_pubsub\_mqtt listens on using
+Prosody's standard config directives, such as `mqtt_ports`. Network
+settings **must** be specified in the global section of the config file,
+not under any particular pubsub component. The default port is 1883
+(MQTT's standard port number).
+
+Compatibility
+-------------
+
+  ------- --------------
+  trunk   Works
+  0.9     Works
+  0.8     Doesn't work
+  ------- --------------