1807
|
1 |
--- |
|
2 |
labels: |
|
3 |
- 'Stage-Beta' |
|
4 |
summary: 'MQTT interface to Prosody''s pubsub' |
|
5 |
... |
|
6 |
|
|
7 |
Introduction |
|
8 |
------------ |
|
9 |
|
|
10 |
[MQTT](http://mqtt.org/) is a lightweight binary pubsub protocol suited |
|
11 |
to embedded devices. This module provides a way for MQTT clients to |
|
12 |
connect to Prosody and publish or subscribe to local pubsub nodes. |
|
13 |
|
|
14 |
Details |
|
15 |
------- |
|
16 |
|
|
17 |
MQTT has the concept of 'topics' (similar to XMPP's pubsub 'nodes'). |
|
18 |
mod\_pubsub\_mqtt maps pubsub nodes to MQTT topics of the form |
|
19 |
`HOST/NODE', e.g.`pubsub.example.org/mynode\`. |
|
20 |
|
|
21 |
### Limitations |
|
22 |
|
|
23 |
The current implementation is quite basic, and in particular: |
|
24 |
|
|
25 |
- Authentication is not supported |
|
26 |
- SSL/TLS is not supported |
|
27 |
- Only QoS level 0 is supported |
|
28 |
|
|
29 |
### Payloads |
|
30 |
|
|
31 |
XMPP payloads are always XML, but MQTT does not define a payload format. |
|
32 |
Therefore mod\_pubsub\_mqtt will attempt to convert data of certain |
|
33 |
recognised payload types. Currently supported: |
|
34 |
|
|
35 |
- JSON (see [XEP-0335](http://xmpp.org/extensions/xep-0335.html) for |
|
36 |
the format) |
|
37 |
- Plain UTF-8 text (wrapped inside |
|
38 |
`<data xmlns="https://prosody.im/protocol/mqtt"/>`) |
|
39 |
|
|
40 |
All other XMPP payload types are sent to the client directly as XML. |
|
41 |
Data published by MQTT clients is currently never translated, and always |
|
42 |
treated as UTF-8 text. |
|
43 |
|
|
44 |
Configuration |
|
45 |
------------- |
|
46 |
|
|
47 |
There is no special configuration for this module. Simply load it on |
|
48 |
your pubsub host like so: |
|
49 |
|
|
50 |
Component "pubsub.example.org" "pubsub" |
|
51 |
modules_enabled = { "pubsub_mqtt" } |
|
52 |
|
|
53 |
You may also configure which port(s) mod\_pubsub\_mqtt listens on using |
|
54 |
Prosody's standard config directives, such as `mqtt_ports`. Network |
|
55 |
settings **must** be specified in the global section of the config file, |
|
56 |
not under any particular pubsub component. The default port is 1883 |
|
57 |
(MQTT's standard port number). |
|
58 |
|
|
59 |
Compatibility |
|
60 |
------------- |
|
61 |
|
|
62 |
------- -------------- |
|
63 |
trunk Works |
|
64 |
0.9 Works |
|
65 |
0.8 Doesn't work |
|
66 |
------- -------------- |