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mod_ping_muc: Describe the client facing protocol (from XEP-0045)
author Kim Alvefur <zash@zash.se>
date Thu, 11 Jul 2024 15:14:33 +0200
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1 ---
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2 labels:
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3 - 'Stage-Beta'
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4 summary: 'MQTT interface to Prosody''s pubsub'
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5 ...
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6
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7 Introduction
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8 ------------
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9
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10 [MQTT](http://mqtt.org/) is a lightweight binary pubsub protocol suited
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11 to embedded devices. This module provides a way for MQTT clients to
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12 connect to Prosody and publish or subscribe to local pubsub nodes.
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13
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14 The module currently implements MQTT version 3.1.1.
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15
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16 Details
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17 -------
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19 MQTT has the concept of 'topics' (similar to XMPP's pubsub 'nodes').
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20 mod\_pubsub\_mqtt maps pubsub nodes to MQTT topics of the form
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21 `<HOST>/<TYPE>/<NODE>`, e.g.`pubsub.example.org/json/mynode`.
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23 The 'TYPE' parameter in the topic allows the client to choose the payload
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24 format it will send/receive. For the supported values of 'TYPE' see the
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25 'Payloads' section below.
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27 ### Limitations
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28
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29 The current implementation is quite basic, and in particular:
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30
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31 - Authentication is not supported
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32 - Only QoS level 0 is supported
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33
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34 ### Payloads
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35
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36 XMPP payloads are always XML, but MQTT does not define a payload format.
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37 Therefore mod\_pubsub\_mqtt has some built-in data format translators.
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38
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39 Currently supported data types:
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40
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41 - `json`: See [XEP-0335](http://xmpp.org/extensions/xep-0335.html) for
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42 the format.
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43 - `utf8`: Plain UTF-8 text (wrapped inside
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44 `<data xmlns="https://prosody.im/protocol/mqtt"/>`)
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45 - `atom_title`: Returns the title of an Atom entry as UTF-8 data
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47 Configuration
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48 -------------
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49
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50 There is no special configuration for this module. Simply load it on
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51 your pubsub host like so:
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52
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53 Component "pubsub.example.org" "pubsub"
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54 modules_enabled = { "pubsub_mqtt" }
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56 You may also configure which port(s) mod\_pubsub\_mqtt listens on using
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57 Prosody's standard config directives, such as `mqtt_ports` and
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58 `mqtt_tls_ports`. Network settings **must** be specified in the global section
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59 of the config file, not under any particular pubsub component. The default
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60 port is 1883 (MQTT's standard port number) and 8883 for TLS connections.
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62 Compatibility
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63 -------------
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66 trunk Works
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67 0.12 Works
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