The Tool Desk
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What the term covers
Two parts matter: the device and the protocol. The protocol is the rule set. The device is simply the thing that follows it. A protocol is not hardware, and a device rarely uses only one.
For the device side, NIST’s IoT FAQ quotes a definition from NIST IR 8259: in-scope IoT devices “have at least one transducer (sensor or actuator) for interacting directly with the physical world and at least one network interface (e.g., Ethernet, Wi-Fi, Bluetooth, Long-Term Evolution [LTE], Zigbee, Ultra-Wideband [UWB]) for interfacing with the digital world.” NIST says this definition was adopted in the IoT Cybersecurity Improvement Act of 2020. Note that this defines an IoT device, not a protocol. Protocols are the rules used across that network interface.
Protocols work in layers
Real systems stack protocols, and each one handles a different job. “The device’s protocol” can therefore mean several things at once. The IETF’s RFC 8352 gives an example of this: CoAP sits at the application layer, while 6LoWPAN is an adaptation layer that carries IPv6 over technologies such as IEEE 802.15.4 and Bluetooth Low Energy.
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This is why Wi-Fi, Bluetooth, MQTT, HTTP and CoAP are not interchangeable names for one kind of thing. Some describe the link a device uses to connect. Others describe how applications exchange messages or requests. Comparing them directly is often a category error.
Common examples
| Example | Role and interaction | What the sources say |
|---|---|---|
| MQTT | Messaging transport; publish/subscribe | MQTT.org calls it an OASIS standard messaging protocol for IoT, lightweight and designed for remote devices with small code footprints and limited bandwidth. It defines three quality-of-service levels for message delivery. |
| CoAP | Application protocol; request/response | RFC 7252 describes request/response interaction, service and resource discovery, design goals for constrained environments, and integration with HTTP. |
| 6LoWPAN | Adaptation layer | RFC 8352 describes it as supporting IPv6 over IEEE 802.15.4 and Bluetooth Low Energy in a lightweight IoT stack. |
| HTTP | Web protocol; request/response | An IEEE IoT report contrasts HTTP’s request/response pattern with MQTT’s publish/subscribe pattern. It is an illustration of two patterns, not a universal performance ranking. |
Two interaction patterns: MQTT and CoAP
Publish/subscribe (MQTT)
Devices publish messages and other parties subscribe to the ones they care about, so senders and receivers do not address each other directly. It suits many small devices reporting data over limited connections. The quality-of-service levels let an application choose how firmly delivery is guaranteed.
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Request/response (CoAP and HTTP)
A client asks a server for something, or tells it to act, and gets a reply. CoAP adds resource discovery and is designed for constrained devices and networks, while mapping onto HTTP.
Choosing or comparing protocols
- Layer and purpose: are the options at the same layer? Protocols from different layers often complement each other rather than compete.
- Interaction pattern: does the application need publish/subscribe, or direct request/response?
- Constraints: how limited are the device’s memory, power and bandwidth?
- Delivery behavior: what happens if a message is lost or repeated?
- Security: how are authentication and encryption provided?
The right answer depends on the device, network, task and system design. No single protocol fits every networked device.
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A protocol name does not guarantee security
MQTT’s FAQ states that network encryption is handled independently and is not built into MQTT itself. Learning that a device uses MQTT, or any other protocol, therefore says little about whether its traffic is encrypted or its endpoints authenticated. Those depend on how the deployment is configured.
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Protocols are also extended for specific uses. IEEE Std 1451.1.6-2025, for example, concerns carrying IEEE 1451 messages over MQTT. IEEE lists it as published on 2026-02-06 and active as of a check on 2026-10-05. Standards status and implementation details change, so confirm them against current official documentation for any real project.
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