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annotate mod_pubsub_mqtt/README.markdown @ 2670:6e01878103c0

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mod_smacks: Ignore user when writing or reading session_cache on prosody 0.9 At least under some circumstances it seems that session.username is nil when a user tries to resume his session in prosody 0.9. The username is not relevant when no limiting is done (limiting the number of entries in the session cache is only possible in prosody 0.10), so this commit removes the usage of the username when accessing the prosody 0.9 session cache.
author tmolitor <thilo@eightysoft.de>
date Thu, 06 Apr 2017 02:12:14 +0200
parents 4d73a1a6ba68
children 2333e384409d
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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 Details
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15 -------
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16
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17 MQTT has the concept of 'topics' (similar to XMPP's pubsub 'nodes').
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18 mod\_pubsub\_mqtt maps pubsub nodes to MQTT topics of the form
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19 `HOST/NODE', e.g.`pubsub.example.org/mynode\`.
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20
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21 ### Limitations
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22
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23 The current implementation is quite basic, and in particular:
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24
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25 - Authentication is not supported
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26 - SSL/TLS is not supported
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27 - Only QoS level 0 is supported
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28
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29 ### Payloads
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30
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31 XMPP payloads are always XML, but MQTT does not define a payload format.
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32 Therefore mod\_pubsub\_mqtt will attempt to convert data of certain
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33 recognised payload types. Currently supported:
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34
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35 - JSON (see [XEP-0335](http://xmpp.org/extensions/xep-0335.html) for
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36 the format)
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37 - Plain UTF-8 text (wrapped inside
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38 `<data xmlns="https://prosody.im/protocol/mqtt"/>`)
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39
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40 All other XMPP payload types are sent to the client directly as XML.
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41 Data published by MQTT clients is currently never translated, and always
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42 treated as UTF-8 text.
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43
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44 Configuration
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45 -------------
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46
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47 There is no special configuration for this module. Simply load it on
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48 your pubsub host like so:
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49
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50 Component "pubsub.example.org" "pubsub"
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51 modules_enabled = { "pubsub_mqtt" }
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52
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53 You may also configure which port(s) mod\_pubsub\_mqtt listens on using
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54 Prosody's standard config directives, such as `mqtt_ports`. Network
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55 settings **must** be specified in the global section of the config file,
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56 not under any particular pubsub component. The default port is 1883
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57 (MQTT's standard port number).
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58
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59 Compatibility
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60 -------------
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61
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62 ------- --------------
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63 trunk Works
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64 0.9 Works
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65 0.8 Doesn't work
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66 ------- --------------