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Subject: [OASIS Issue Tracker] (MQTT-608) Add gateway retransmssion. and clarify client retransmission
[ https://issues.oasis-open.org/browse/MQTT-608?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=84302#comment-84302 ] Davide Lenzarini edited comment on MQTT-608 at 2/15/24 12:57 PM: ----------------------------------------------------------------- _"A Client MUST retransmit CONNECT, AUTH, REGISTER, PUBLISH Qos1, PUBLISH Qos2, PUBREL, SUBSCRIBE, UNSUBSCRIBE, WILLTOPICUPD, WILLMSGUPD Packets after Tretry has passed or close the Virtual Connection."_ _"A Gateway MUST retransmit WILLTOPICREQ, WILLMSGREQ, PUBLISH Qos1, PUBLISH Qos2, PUBREL Packets after Tretry has passed or close the Virtual Connection."_ [~AndrewBanks]I would propose the following changes * "A Client MUST retransmit CONNECT, AUTH, REGISTER, PUBLISH Qos1, PUBLISH Qos2, PUBREL, SUBSCRIBE, UNSUBSCRIBE--, WILLTOPICUPD, WILLMSGUPD-- Packets *{color:#de350b}and the PROTECTION packet, if wrapping one of them,{color}* after Tretry has passed or close the Virtual Connection." * "A Gateway MUST retransmit -WILLTOPICREQ, WILLMSGREQ,- PUBLISH Qos1, PUBLISH Qos2, PUBREL PacketsÂ{color:#de350b}*and the PROTECTION packet, if wrapping one of them,*{color} after Tretry has passed or close the Virtual Connection." was (Author: davide.lenzarini): _"A Client MUST retransmit CONNECT, AUTH, REGISTER, PUBLISH Qos1, PUBLISH Qos2, PUBREL, SUBSCRIBE, UNSUBSCRIBE, WILLTOPICUPD, WILLMSGUPD Packets after Tretry has passed or close the Virtual Connection."_ _"A Gateway MUST retransmit WILLTOPICREQ, WILLMSGREQ, PUBLISH Qos1, PUBLISH Qos2, PUBREL Packets after Tretry has passed or close the Virtual Connection."_ [~AndrewBanks]I would propose the following changes * "A Client MUST retransmit CONNECT, AUTH, REGISTER, PUBLISH Qos1, PUBLISH Qos2, PUBREL, SUBSCRIBE, UNSUBSCRIBE-, WILLTOPICUPD, WILLMSGUPD- Packets *{color:#de350b}and the PROTECTION packet, if wrapping one of them,{color}* after Tretry has passed or close the Virtual Connection." * "A Gateway MUST retransmit -WILLTOPICREQ, WILLMSGREQ,- PUBLISH Qos1, PUBLISH Qos2, PUBREL PacketsÂ{color:#de350b}*and the PROTECTION packet, if wrapping one of them,*{color} after Tretry has passed or close the Virtual Connection." > Add gateway retransmssion. and clarify client retransmission > ------------------------------------------------------------ > > Key: MQTT-608 > URL: https://issues.oasis-open.org/browse/MQTT-608 > Project: OASIS Message Queuing Telemetry Transport (MQTT) TC > Issue Type: Improvement > Components: MQTT-SN > Reporter: Andrew Banks > Priority: Major > > The current specification describes the need for client retransmission in section 4.18, > however there circumstances where the gateway will also need to retransmit packets. >  > Discussion points. > 1) There is little difference between sending PUBLISH Qos1 NRetry times and then stopping, and sending PUBLISH Qos 0? > 2) Once a Qos2 PUBLISH has been sent the receiver may have stored state that it is obliged to keep until it has received PUBREL. MQTT states that > in this case the sender MUST NOT apply Publication expiry if a PUBLISH packet has been sent, so that the receivers state is always deleted eventually. > MQTT-SN needs to do something similar , so Nretry can't apply to Qos2 messages. > 3) Clean start can be used by the Client to reset the protocol Session state if necessary. Session Present can be used by the Gateway > to indicate that it has deleted the Session State. The client and Gateway already have a mechanism to close the Virtual Connection and restart > with the Session state reset, so that NRetry would not be needed. > 4) A retransmitted packet must be identical to the predecessor, otherwise it is ambiguous as to which version is being acknowledged. Is this OK with the Protection Envelope? -- This message was sent by Atlassian Jira (v8.3.3#803004)
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