[OASIS Issue Tracker] (MQTT-260) Add a CONNACK code of 'Try Another Server'

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

Raphael Cohen created MQTT-260:
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             Summary: Add a CONNACK code of 'Try Another Server'
                 Key: MQTT-260
                 URL: https://issues.oasis-open.org/browse/MQTT-260
             Project: OASIS Message Queuing Telemetry Transport (MQTT) TC
          Issue Type: Improvement
          Components: futures
    Affects Versions: 3.1.1
            Reporter: Raphael Cohen
            Assignee: Raphael Cohen


If we add a CONNACK return code of 'Try Another Server', this makes it easier for over-loaded servers to tell clients to redirect. This works in conjunction with MQTT-259, which advocates the use of DNS SRV records.

Indeed, if we also added server-originated DISCONNECT packets with this return code, we could get clients to cleanly migrate to another server when a server is shutdown for maintenance.

Please note, I do not favour the server also reporting which new server to connect to. There in lies the route to madness, as it means the current server has to know the state of all the others. That's intimate knowledge.



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