Rafael H. Schloming resolved PROTON-17.

    Resolution: Fixed
> pn_drain(link, 0) doesn't trigger issuing of flow
> -------------------------------------------------
>                 Key: PROTON-17
>                 URL: https://issues.apache.org/jira/browse/PROTON-17
>             Project: Qpid Proton
>          Issue Type: Bug
>          Components: proton-c
>            Reporter: Gordon Sim
>            Assignee: Rafael H. Schloming
>         Attachments: PROTON-17.patch
> In implementing a timed synchronous get, I issue one unit of credit, wait for 
> the time specified, then I want to drain that credit in order to 
> unambiguously  determine if a message arrived or not. I don't want to 
> increase the credit so in calling pn_drain() I want the second parameter to 
> be 0. However doing so fails to trigger a new flow to be sent (with the drain 
> flag set). Using a non-zero credit value, i.e. increasing the credit, does 
> trigger the flow.

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