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Backed out changeset e491a15d7621 (closes #888)
author Kim Alvefur <zash@zash.se>
date Sat, 15 Apr 2017 15:35:55 +0200
parents ffb6646b4253
children 0957ba6aeb99
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1 ---
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2 labels:
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3 - 'Stage-Alpha'
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4 summary: 'XEP-0198: Reliability and fast reconnects for XMPP'
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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 By default XMPP is as reliable as your network is. Unfortunately in some
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11 cases that is not very reliable - in some network conditions disconnects
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12 can be frequent and message loss can occur.
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13
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14 To overcome this, XMPP has an optional extension (XEP-0198: Stream
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15 Management) which, when supported by both the client and server, can
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16 allow a client to resume a disconnected session, and prevent message
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17 loss.
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19 Details
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20 =======
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21
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22 When using XEP-0198 both the client and the server keep a queue of the
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23 most recently sent stanzas - this is cleared when the other end
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24 acknowledges they have received the stanzas. If the client disconnects,
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25 instead of marking the user offline the server pretends the client is
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26 still online for a short (configurable) period of time. If the client
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27 reconnects within this period, any stanzas in the queue that the client
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28 did not receive are re-sent.
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30 If the client fails to reconnect before the timeout then it is marked
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31 offline as normal, and any stanzas in the queue are returned to the
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32 sender as a "recipient-unavailable" error.
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33
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34 If you don't want this behaviour on timeout you can use [mod_smacks_offline]
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35 or [mod_smacks_noerror] to customize the behaviour further.
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36
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37 This module also provides some events used by [mod_cloud_notify].
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38 These events are: "smacks-ack-delayed", "smacks-hibernation-start" and
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39 "smacks-hibernation-end". See [mod_cloud_notify] for details on how this
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40 events are used there.
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41
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42 Use prosody 0.10+ to have per user limits on allowed sessions in hibernation
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43 state and allowed sessions for which the h-value is kept even after the
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44 hibernation timed out.
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45 These are settable using `smacks_max_hibernated_sessions` and `smacks_max_old_sessions`.
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46
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47 Configuration
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48 =============
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49
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50 Option Default Description
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51 ---------------------------------- ----------------- ------------------------------------------------------------------------------------------------------------------
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52 `smacks_hibernation_time` 300 (5 minutes) The number of seconds a disconnected session should stay alive for (to allow reconnect)
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53 `smacks_enabled_s2s` false Enable Stream Management on server connections? *Experimental*
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54 `smacks_max_unacked_stanzas` 0 How many stanzas to send before requesting acknowledgement
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55 `smacks_max_ack_delay` 60 (1 minute) The number of seconds an ack must be unanswered to trigger an "smacks-ack-delayed" event
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56 `smacks_max_hibernated_sessions` 10 The number of allowed sessions in hibernated state (limited per user)
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57 `smacks_max_old_sessions` 10 The number of allowed sessions with timed out hibernation for which the h-value is still kept (limited per user)
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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 0.10 Works
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64 0.9 Works, no per user limit of hibernated sessions
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65 0.8 Works, no per user limit of hibernated sessions, use version [7693724881b3]
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66 ----- -----------------------------------------------------------------------------
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67
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69 Clients
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70 =======
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71
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72 Clients that support [XEP-0198]:
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74 - Gajim (Linux, Windows, OS X)
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75 - Conversations (Android)
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76 - ChatSecure (iOS)
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77 - Swift (but not resumption, as of version 2.0 and alphas of 3.0)
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78 - Psi (in an unreleased branch)
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79 - Yaxim (Android)
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80 - Monal (iOS)
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82 [7693724881b3]: //hg.prosody.im/prosody-modules/raw-file/7693724881b3/mod_smacks/mod_smacks.lua
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83 [mod_smacks_offline]: //modules.prosody.im/mod_smacks_offline
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84 [mod_smacks_noerror]: //modules.prosody.im/mod_smacks_noerror
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85 [mod_cloud_notify]: //modules.prosody.im/mod_cloud_notify