- u -

• unackedOperationCount : Aws::Crt::Mqtt5::Mqtt5ClientOperationStatistics , Aws::Crt::Mqtt::MqttConnectionOperationStatistics
• unackedOperationSize : Aws::Crt::Mqtt5::Mqtt5ClientOperationStatistics , Aws::Crt::Mqtt::MqttConnectionOperationStatistics
• userData : Aws::Crt::Imds::WrappedCallbackArgs< T >
• Username : Aws::Crt::Http::HttpProxyStrategyBasicAuthConfig
• useTls : Aws::Crt::Mqtt::MqttConnectionOptions
• useWebsocket : Aws::Crt::Mqtt::MqttConnectionOptions