RabbitMQ has been traditionally used for IoT devices since it supports MQTT protocol which is a common protocol in that space.

However I would not recommend Redis for real-time data processing. At my work Redis had problem in scaling, especially as a message queuing system. I have explained that particular problem and how we solved it with RabbitMQ here at Polling reliably at scale using DLQs .

If your are confused between Kafka and RabbitMQ, this post which explains the differences between Kafka and RabbitMQ might help.