[OASIS Issue Tracker] (MQTT-256) Message Format indication

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

Peter Niblett created MQTT-256:
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             Summary: Message Format indication
                 Key: MQTT-256
                 URL: https://issues.oasis-open.org/browse/MQTT-256
             Project: OASIS Message Queuing Telemetry Transport (MQTT) TC
          Issue Type: Bug
          Components: futures
            Reporter: Peter Niblett


MQTT 3.1.1 does not provide an architected way of indicating the format of the payload that is passed in a PUBLISH packet. We need to avoid the risk of spec or data bloat, and I'm not advocating adding a complicated header structure that passes schemas, messageType indicators, MIME type strings or the like, but at the moment there is no standard way for a receiver even to be able to tell whether the payload is binary or string. 
There are three ways that this can be dealt with today:

1. The Receiver already knows. It's implementing some bigger standard or program design which has dictated the encoding format (e.g. someone decides that all messages will be JSON)

2. There is an indicator embedded somewhere in the Topic name (The Topic name is  the only header we have in MQTT 3.1.1). There isn't a standard convention for this, so topic space designers have to choose their own way of doing it.

3. The Receiver assumes one format and has a go parsing it. If that doesn't look right it tries another




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