[OASIS Issue Tracker] (MQTT-285) Subscribe options for retained messages

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

Ken Borgendale created MQTT-285:
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             Summary: Subscribe options for retained messages
                 Key: MQTT-285
                 URL: https://issues.oasis-open.org/browse/MQTT-285
             Project: OASIS Message Queuing Telemetry Transport (MQTT) TC
          Issue Type: New Feature
          Components: futures
            Reporter: Ken Borgendale
            Assignee: Ken Borgendale


This issue came up when reviewing MQTT-235 (nolocal) as it affects the bridge use case along with others.

The current setting of the retain flag on PUBLISH and the handling of retained messages on SUBSCRIBE is normally correct when the client really is a subscribing client, it is not correct behavior when the client is going to forward the message on in a bridge or filter use case.

There are two issues here
1. In some case the subscriber does not want to get any messages which are retained at the time of the subscription.

2. If the subscriber is going to re-publish the message it needs to know if the messages was published with the retain flag, rather than that it came from a retained source




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