How to get UserProperties from InterceptingSubscriptionEventArgs in InterceptingSubscriptionAsync handler

[tulio84z]

Both my client and server are using versions 4.3.3.952

This is my client:

var options = new MqttClientOptionsBuilder()
    .WithTcpServer("localhost", 1883)
    .WithClientId("myclient")
    .WithCredentials("myuser", "123")
    .WithUserProperty("myuserproperty", "some user property value")
    .WithProtocolVersion(MqttProtocolVersion.V500)
    .Build();

var managedClientOptions = new ManagedMqttClientOptionsBuilder()
    .WithClientOptions(options)
    .Build();
                
await mqttClient.StartAsync(managedClientOptions);

var topic = "testtopic";
await mqttClient.SubscribeAsync(topic);

This is on the serve side:

var mqttServerOptions = new MqttServerOptionsBuilder()
    .WithDefaultEndpoint()
    .WithDefaultEndpointPort(1883)
    .Build();

var mqttFactory = new MqttFactory();
using var mqttServer = mqttFactory.CreateMqttServer(mqttServerOptions);

mqttServer.InterceptingSubscriptionAsync += MqttServerOnInterceptingSubscriptionAsync;

Task MqttServerOnInterceptingSubscriptionAsync(InterceptingSubscriptionEventArgs interceptingSubscriptionEventArgs )
{
    //This is always null. Why is that?
    var userProperties = interceptingSubscriptionEventArgs.UserProperties;

    return Task.CompletedTask;
}

I want the user properties because it seems to be the only way to get metadata from the client to the server. While publishing im having no problem getting the UserProperties, why is it different with Subscribe?

[tulio84z]

It seems to me that this issue (#1702) is NOT fixed in version 4.3.3.952.

[tulio84z]

Oh i see here in this unitTest that this is only available for the non managed client:

        [TestMethod]
        public async Task Intercept_Subscribe_With_User_Properties()
        {
            using (var testEnvironment = CreateTestEnvironment(MqttProtocolVersion.V500))
            {
                var server = await testEnvironment.StartServer();

                InterceptingSubscriptionEventArgs eventArgs = null;
                server.InterceptingSubscriptionAsync += e =>
                {
                    eventArgs = e;
                    return CompletedTask.Instance;
                };

                var client = await testEnvironment.ConnectClient();

                var subscribeOptions = testEnvironment.Factory.CreateSubscribeOptionsBuilder().WithTopicFilter("X").WithUserProperty("A", "1").Build();
                await client.SubscribeAsync(subscribeOptions);

                CollectionAssert.AreEqual(subscribeOptions.UserProperties.ToList(), eventArgs.UserProperties);
            }
        }

Are there any plans to include sending userProperties for subscribe in the managed client as well?

[MrLemon0908]

我也遇到同样的问题，我是在服务器拦截到客户端消息时，把发送者id添加进用户信息，同样没有效果