What is the equivalent for MqttClientOptionsBuilder extension WithTrustChain ?

[weirdyang]

For .NET 6 and below, how do I reproduce the extension method WithTrustChain ?

#if NET7_0_OR_GREATER
        public MqttClientTlsOptionsBuilder WithTrustChain(X509Certificate2Collection chain)
        {
            _tlsOptions.TrustChain = chain;
            return this;
        }

#endif

[weirdyang]

I copied the code from here and it seems to work:
https://github.com/iotmodels/MQTTnet.Extensions.MultiCloud/blob/master/src/MQTTnet.Extensions.MultiCloud/Connections/X509ChainValidator.cs

[rido-min]

I'd say this is a better version for X509ChainValidator

https://github.com/Azure-Samples/MqttApplicationSamples/blob/701367c9de7145362a85c36747673822cead8af0/mqttclients/dotnet/MQTTnet.Client.Extensions/X509ChainValidator.cs

[weirdyang]

Thanks will update to use that, btw I noticed you maintain both of those repos, do you have any recommendations on how to better my understanding of certificate validation etc? or perhaps how did you learn what is required?