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Subject: [OASIS Issue Tracker] (MQTT-385) Simple clients skipping properties
[ https://issues.oasis-open.org/browse/MQTT-385?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=64817#comment-64817 ] Stefan Hagen commented on MQTT-385: ----------------------------------- My understanding was a more defensive "look-ahead" allowance for skinny clients, along the lines of: It can ignore property NOT_NEEDED at any time, if it does not make use of NOT_NEEDED (enhancing interoperability by blocking "ignore first than bluntly assume second" client behavior) - but I may well be wrong. So kind of "Postels law" with emphasis on the second (sender/producer) part. > Simple clients skipping properties > ---------------------------------- > > Key: MQTT-385 > URL: https://issues.oasis-open.org/browse/MQTT-385 > Project: OASIS Message Queuing Telemetry Transport (MQTT) TC > Issue Type: Bug > Components: edits > Affects Versions: 5, wd10 > Reporter: Brian Raymor > Priority: Minor > Fix For: 5, wd10 > > > What is the rationale for this exemption -and- how is it interoperable? > 757 A Client MAY process the Packet without checking the Properties by skipping over the number of bytes > 758 specified by Property Length. A Client which does not check the Properties MUST NOT make use of any > 759 Property it has not checked. A Server MUST check all Properties in a Control Packet. > 760 > 761 Non normative comment > 762 This exemption for Clients is designed to allow for simple Clients that do not require the > 763 information sent in Properties. A full function Client should check and use the information in the > 764 Properties. -- This message was sent by Atlassian JIRA (v6.2.2#6258)
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