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Building connected car services can be a challenge due to the unreliable nature of the cellular network and the requirement for bi-directional communication. MQTT's publish/subscribe protocol is well designed to address these challenges and is well suited for moving data between the car and cloud platform.
Simply having 10 connected devices could mean that your MQTT broker should be capable of handling scaling to 100 simultaneous messages.
This article is a deep dive into MQTT, its history, its optimal use case and its future.