In Internet applications, message queues are generally integrated to perform operations such as peak clipping, current limiting, and queue processing to decouple data from services. With the help of RabbitMQ, Kafka, RocketMQ, Pulsar and other message and stream middleware bridging functions provided by EMQ X, IoT projects can also use this model to solve the above problems.
MQTT is completely different from Kafka. MQTT is a protocol and a technical standard developed by members (mostly are top engineers at IBM and Microsoft) of the OASIS Technical Committee. Kafka is an open source streaming platform that has been implemented. It was firstly developed by LinkedIn. After incubated by Apache Incubator in 2011 after opening source, it has became the top project of the Apache Software Foundation.