MQTT, Kafka, NATS, or Zenoh? Choosing Edge-to-Cloud Messaging by Traffic Pattern

Edge to cloud is not one integration problem. It is four: telemetry going up, control going down, sites syncing sideways, and data reaching people. Each has different physics. Most failed projects picked one technology for all four.

Every enterprise with factories, stores, vehicles, hospitals, or devices faces the same architectural question. How does data move between the edge and the data center or cloud, in both directions, reliably, securely, and at acceptable cost? The vendor landscape answers with dozens of overlapping options: MQTT platforms, hyperscaler services, event streaming, event mesh, messaging fabrics, delivery platforms, and protocol proxies. This article structures the option space by traffic pattern instead of by product category, maps the vendor categories onto those patterns, and closes with a decision framework you can apply to your own architecture.