Robbie Gemmell created PROTON-795:
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             Summary: add support for 'echo' on Flow frames/events
                 Key: PROTON-795
                 URL: https://issues.apache.org/jira/browse/PROTON-795
             Project: Qpid Proton
          Issue Type: Bug
          Components: proton-c, proton-j
    Affects Versions: 0.8
            Reporter: Robbie Gemmell


Flow frames have an 'echo' field [1], used to request peers send their updated 
state. This would be useful to e.g attempt stopping a link without 'drain', or 
requesting a Flow response is sent when also 'drain'ing (since Proton does not 
send one if all the credit has already been used when the drain is actioned).

Currently this field is not inspected by proton itself, or exposed in any way 
that an application could inspect this (or it must be said, set it) itself, so 
it isnt currently possible to honour an echo request from a [non-Proton] peer.

[1] 
http://docs.oasis-open.org/amqp/core/v1.0/os/amqp-core-transport-v1.0-os.html#type-flow



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