Need Guidance on PublishRequest TimeoutHint|OPC UA Standard|Forum|OPC Foundation

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Need Guidance on PublishRequest TimeoutHint
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Ross Turton
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06/19/2026 - 08:44
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The UA Spec indicates that the TimeoutHint from the UA Client is a suggestion to the UA Server.  The UA Server should use the timeouthint provided by the client as the minimum timeout.  

Given that PublishRequests are using for multiple subscriptions, say you have the following 3 subscriptions:

10,000 ms  Publishing Interval

15,000 ms Publishing Interval

86, 400, 000 ms (24 Hour) Publishing Interval

 

What would be the recommended Timeout Hint to use for Publishing Intervals given that if I use something greater than 24 Hours it will take 24+ hours for the requests to timeout for the faster publishing intervals?

This would cause excessive delays to users in knowing that the requests for faster publishing intervals have timed out.

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