WithApplicationMessageInterceptor on v4

[wootapa]

Trying to find the server event in version 4, that is the equivalent of what is mentioned here: #1467, but I cant find anything. I would like to intercept messages based on the receiving client. Could you give a hint?

[SeppPenner]

Take a look at

MQTTnet/Samples/Server/Server_Intercepting_Samples.cs

Line 16 in e18a91a

public static class Server_Intercepting_Samples

[wootapa]

That's what I've used but InterceptingPublishAsync fires once per message. I would like to filter each message once per client, so I can reject based on client conditions. Possible?

[SeppPenner]

I'm not sure if this is possible...

[Jeanot-Zubler]

use server.InterceptingClientEnqueueAsync

[wootapa]

That's the one. Thanks.
I also looked through the code to find a way to limit the retained messages upon subscription, but they seem filtered only based on the topic here MqttClientSubscription.FilterRetainedApplicationMessages

MQTTnet/Source/MQTTnet/Server/Internal/MqttClientSubscriptionsManager.cs

Line 462 in e18a91a

subscribeResult.RetainedMessages.Add(retainedMessageMatch);

It could possibly make sense to also have a hook here, basically doing the same thing as in server.InterceptingClientEnqueueAsync as a way to opt out for a specific message. What do you think?