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Subject: [OASIS Issue Tracker] (MQTT-572) Clarification of text advising number of inflight messages


     [ https://issues.oasis-open.org/browse/MQTT-572?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Simon Johnson updated MQTT-572:
-------------------------------
    Description: 
Presently, the specification section *6.6 Client Publish* reads;

_At any point in time a client may have only one QoS level 1 or 2 PUBLISH message outstanding, i.e. it has to wait for the termination of this PUBLISH message exchange before it could start a new level 1 or 2 transaction._

This is ambiguous and needs to state that the number of message inflight (and indeed message Ids) are PER NETWORK DIRECTION. For example, it is perfectly fine for a device to be sending a message whilst also receiving a message. 

QUESTION.. given that that message Ids are also per direction, this means that inflight message storage for acknowledgement cannot be shared between inbound and outbound messages, as a gateway could publish with ID 3 at the same time as the device PUBLISHs at ID 3. How is it suggested this is handled?

  was:
Presently, the specification section *6.6 Client Publish* reads;

_At any point in time a client may have only one QoS level 1 or 2 PUBLISH message outstanding, i.e. it has to wait for the termination of this PUBLISH message exchange before it could start a new level 1 or 2 transaction._

This is ambiguous and needs to state that the number of message inflight (and indeed message Ids) are PER NETWORK DIRECTION. For example, it is perfectly fine for a device to be sending a message whilst also receiving a message. QUESTION.. given that that message Ids are also per direction, this means that inflight message storage for acknowledgement cannot be shared between inbound and outbound messages, as a gateway could publish with ID 3 at the same time as the device PUBLISHs at ID 3. How is it suggested this is handled?


> Clarification of text advising number of inflight messages
> ----------------------------------------------------------
>
>                 Key: MQTT-572
>                 URL: https://issues.oasis-open.org/browse/MQTT-572
>             Project: OASIS Message Queuing Telemetry Transport (MQTT) TC
>          Issue Type: Task
>          Components: MQTT-SN
>            Reporter: Simon Johnson
>            Assignee: Simon Johnson
>            Priority: Major
>
> Presently, the specification section *6.6 Client Publish* reads;
> _At any point in time a client may have only one QoS level 1 or 2 PUBLISH message outstanding, i.e. it has to wait for the termination of this PUBLISH message exchange before it could start a new level 1 or 2 transaction._
> This is ambiguous and needs to state that the number of message inflight (and indeed message Ids) are PER NETWORK DIRECTION. For example, it is perfectly fine for a device to be sending a message whilst also receiving a message. 
> QUESTION.. given that that message Ids are also per direction, this means that inflight message storage for acknowledgement cannot be shared between inbound and outbound messages, as a gateway could publish with ID 3 at the same time as the device PUBLISHs at ID 3. How is it suggested this is handled?



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