Edge Protocols vs Cloud Protocols: Where the Line Actually Falls
Different protocols tend to dominate at different layers of a system — locally at the edge, and centrally in the cloud. Here's how that division typically works.
Why the edge and the cloud often use different protocols
At the edge — the physical devices and local gateways — protocols like Zigbee, Modbus and BLE dominate, optimised for low power, short range and local reliability. Once data reaches a gateway and needs to travel to the cloud, protocols like MQTT or HTTPS take over, optimised instead for internet-scale reliability and broader compatibility.
Why this layered approach makes practical sense
A battery-powered field sensor doesn't need internet-grade protocol overhead for a short-range local connection to a nearby gateway, and a cloud dashboard doesn't need to understand dozens of niche local device protocols directly — the gateway's translation role is exactly what allows each layer to use the protocol best suited to its own specific constraints.
What this means for evaluating a system's architecture
A well-architected IoT system deliberately separates these concerns — local reliability at the edge, broad compatibility in the cloud — rather than trying to force one protocol to do both jobs. This layered thinking is worth understanding conceptually when evaluating a proposed system design, even without needing deep technical protocol knowledge yourself.
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