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mod_pubsub_mqtt/README.md

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mod_conversejs: Serve base app at / This makes things slightly less awkward for the browser to figure out which URLs belong to a PWA. The app's "start URL" was previously without the '/' and therefore was not considered within the scope of the PWA. Now the canonical app URL will always have a '/'. Prosody/mod_http should take care of redirecting existing links without the trailing / to the new URL. If you have an installation at https://prosody/conversejs then it is now at https://prosody/conversejs/ (the first URL will now redirect to the second URL if you use it). The alternative would be to make the PWA scope include the parent, i.e. the whole of https://prosody/ in this case. This might get messy if other PWAs are provided by the same site or Prosody installation, however.
author Matthew Wild <mwild1@gmail.com>
date Tue, 11 Feb 2025 13:18:38 +0000
parent 6003:fe081789f7b5
line wrap: on
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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.

The module currently implements MQTT version 3.1.1.

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>/<TYPE>/<NODE>`, e.g.`pubsub.example.org/json/mynode`.

The 'TYPE' parameter in the topic allows the client to choose the payload
format it will send/receive. For the supported values of 'TYPE' see the
'Payloads' section below.

### Limitations

The current implementation is quite basic, and in particular:

-   Authentication 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 has some built-in data format translators.

Currently supported data types:

-   `json`: See [XEP-0335](http://xmpp.org/extensions/xep-0335.html) for
    the format.
-   `utf8`: Plain UTF-8 text (wrapped inside
    `<data xmlns="https://prosody.im/protocol/mqtt"/>`)
-   `atom_title`: Returns the title of an Atom entry as UTF-8 data

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` and
`mqtt_tls_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) and 8883 for TLS connections.

Compatibility
-------------

  ------- --------------
  trunk   Works
  0.12    Works
  ------- --------------