> On 9 May 2019, at 18:00, Robbie Gemmell <[email protected]> wrote:
> 
> On the wire, the key in the message annotations map needs to be of
> 'symbol' type rather than string, with the delivery time value a long.
> I havent tried this but for the former I believe something like
> "symbol('x-opt-delivery-time')" would be what you need.

Yup - that was it! Importing symbol from proton._data did the trick.

Thanks!

Neil

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