| author | tmolitor <thilo@eightysoft.de> |
| Sun, 05 Mar 2017 20:23:53 +0100 | |
| changeset 2600 | ffb6646b4253 |
| parent 2507 | 7036a6e074d7 |
| child 3971 | 0957ba6aeb99 |
| permissions | -rw-r--r-- |
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--- |
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labels: |
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- 'Stage-Alpha' |
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summary: 'XEP-0198: Reliability and fast reconnects for XMPP' |
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... |
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Introduction |
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============ |
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By default XMPP is as reliable as your network is. Unfortunately in some |
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cases that is not very reliable - in some network conditions disconnects |
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can be frequent and message loss can occur. |
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To overcome this, XMPP has an optional extension (XEP-0198: Stream |
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Management) which, when supported by both the client and server, can |
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allow a client to resume a disconnected session, and prevent message |
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loss. |
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Details |
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======= |
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When using XEP-0198 both the client and the server keep a queue of the |
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most recently sent stanzas - this is cleared when the other end |
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acknowledges they have received the stanzas. If the client disconnects, |
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instead of marking the user offline the server pretends the client is |
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still online for a short (configurable) period of time. If the client |
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reconnects within this period, any stanzas in the queue that the client |
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did not receive are re-sent. |
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If the client fails to reconnect before the timeout then it is marked |
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offline as normal, and any stanzas in the queue are returned to the |
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sender as a "recipient-unavailable" error. |
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If you don't want this behaviour on timeout you can use [mod_smacks_offline] |
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or [mod_smacks_noerror] to customize the behaviour further. |
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This module also provides some events used by [mod_cloud_notify]. |
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These events are: "smacks-ack-delayed", "smacks-hibernation-start" and |
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"smacks-hibernation-end". See [mod_cloud_notify] for details on how this |
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events are used there. |
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Use prosody 0.10+ to have per user limits on allowed sessions in hibernation |
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state and allowed sessions for which the h-value is kept even after the |
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hibernation timed out. |
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These are settable using `smacks_max_hibernated_sessions` and `smacks_max_old_sessions`. |
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Configuration |
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============= |
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Option Default Description |
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---------------------------------- ----------------- ------------------------------------------------------------------------------------------------------------------ |
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`smacks_hibernation_time` 300 (5 minutes) The number of seconds a disconnected session should stay alive for (to allow reconnect) |
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`smacks_enabled_s2s` false Enable Stream Management on server connections? *Experimental* |
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`smacks_max_unacked_stanzas` 0 How many stanzas to send before requesting acknowledgement |
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`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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`smacks_max_hibernated_sessions` 10 The number of allowed sessions in hibernated state (limited per user) |
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`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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Compatibility |
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============= |
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----- ----------------------------------------------------------------------------- |
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0.10 Works |
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0.9 Works, no per user limit of hibernated sessions |
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0.8 Works, no per user limit of hibernated sessions, use version [7693724881b3] |
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----- ----------------------------------------------------------------------------- |
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Clients |
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======= |
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Clients that support [XEP-0198]: |
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- Gajim (Linux, Windows, OS X) |
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- Conversations (Android) |
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- ChatSecure (iOS) |
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- Swift (but not resumption, as of version 2.0 and alphas of 3.0) |
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- Psi (in an unreleased branch) |
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- Yaxim (Android) |
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- Monal (iOS) |
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[7693724881b3]: //hg.prosody.im/prosody-modules/raw-file/7693724881b3/mod_smacks/mod_smacks.lua |
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[mod_smacks_offline]: //modules.prosody.im/mod_smacks_offline |
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[mod_smacks_noerror]: //modules.prosody.im/mod_smacks_noerror |
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[mod_cloud_notify]: //modules.prosody.im/mod_cloud_notify |