[OASIS Issue Tracker] (MQTT-604) Specify requirements on the underlying network transport

[OASIS Issues Tracker <workgroup_mailer@lists.oasis-open.org>]

    [ https://issues.oasis-open.org/browse/MQTT-604?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=83763#comment-83763 ] 

Davide Lenzarini commented on MQTT-604:
---------------------------------------

"_The network must not deliver a datagram more than once._"

I would recommend the following

If the network layer is not able to avoid, also if only from a theoretical standpoint, duplicated packets, like UDP, it is recommended to use the ProtectionPacket with the monotonic counter field filled. This way the gateway has a way to identify duplicated packets.

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> Specify requirements on the underlying network transport
> --------------------------------------------------------
>
>                 Key: MQTT-604
>                 URL: https://issues.oasis-open.org/browse/MQTT-604
>             Project: OASIS Message Queuing Telemetry Transport (MQTT) TC
>          Issue Type: Task
>          Components: MQTT-SN
>    Affects Versions: v2.0
>            Reporter: Ian Craggs
>            Assignee: Andrew Banks
>            Priority: Major
>
> The section on "Networks and Transport Layers" needs to specify the requirements on the underlying transport, as MQTT 5.0 does in the normative statement:
> A Client or Server MUST support the use of one or more underlying transport protocols that provide an ordered, lossless, stream of bytes from the Client to Server and Server to Client [MQTT-4.2-1].



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