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Old March 1st, 2010   #4
sblair
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Queued messages are not mandated. Most of us wish they were but a few folks were deadset against it.

Ultimately devices that chose not to support Queued Messages may not be as well supported on many controllers as devices that do.

As I said a good controller makes use of both Queued Message polling and querying specific parameters that it needs to know about. Also, as I said the device makes the determination what it thinks is important to report back to the controller via Queued Messages (if it supports them).

A good controller will make sure to poll a specific parameter to ensure it has the right value at the point it is needed most, for example when a user is editing that setting. Before allowing the user to edit, the controller can do a GET on that specific parameter to make sure it is reporting the current value.
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Scott M. Blair
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