What Are IoT Connectivity Technologies?
IoT connectivity technologies are the communication layers that let connected devices — sensors, gateways, controllers, cameras and edge computers — exchange data with each other, with local networks and with cloud or on-premise platforms. Choosing the right one is a trade-off between range, bandwidth, power consumption, latency, cost per node and the environment the device has to survive in. In practice most real deployments use more than one: a short-range radio for sensors, a wired or cellular backhaul to the internet, and a local protocol for machine-to-machine coordination.
The Main Categories
Short-range wireless covers Wi-Fi (2.4/5/6 GHz), Bluetooth and Bluetooth Low Energy (BLE), Zigbee and Thread (both built on IEEE 802.15.4), and RFID/NFC for identification and asset tagging. These are ideal for indoor deployments with dense node counts, low power budgets and modest data rates.
Long-range and low-power wide-area (LPWAN) technologies include LoRa/LoRaWAN, Sigfox, NB-IoT and LTE-M. They trade bandwidth for range and battery life, often reaching 2–15 km in open areas and running for years on a single cell. They are commonly used for smart metering, agriculture, environmental monitoring and asset tracking.
Wired and industrial fieldbus technologies remain the backbone of factories and utilities: Ethernet (including industrial and time-sensitive networking variants), RS-232/RS-485 serial, Modbus RTU/TCP, CAN bus, PROFINET, EtherCAT and BACnet for building automation. Wired links are still the first choice where determinism, immunity to interference and long service life matter more than installation flexibility.
Cellular and satellite backhaul — 4G LTE, 5G, LTE Cat-M/NB-IoT and increasingly satellite IoT — provide wide-area coverage where no fixed line exists. MQTT, MQTT-SN, CoAP, AMQP and OPC UA sit above these transports as the application-layer messaging standards that most IoT platforms actually speak.
Comparison at a Glance
| Technology | Typical Range | Data Rate | Power | Common Use Cases |
|---|---|---|---|---|
| Wi-Fi 5/6 | 30–100 m | 100 Mbps–1 Gbps+ | High | Gateways, cameras, edge computers |
| Bluetooth LE | 10–50 m | ~1–2 Mbps | Very low | Wearables, beacons, provisioning |
| Zigbee / Thread | 10–100 m (mesh) | 250 kbps | Low | Home and building automation |
| LoRaWAN | 2–15 km | 0.3–50 kbps | Very low | Metering, agriculture, tracking |
| NB-IoT / LTE-M | Cellular coverage | 20 kbps–1 Mbps | Low | Smart meters, fleet, remote assets |
| Ethernet / TSN | 100 m per segment | 100 Mbps–10 Gbps | Mains | Factory floors, control rooms |
| RS-485 / Modbus | 1200 m | Up to 10 Mbps | Mains | PLCs, inverters, energy meters |
| CAN bus | 40–1000 m | Up to 1 Mbps | Mains | Vehicles, machinery, robotics |
| 5G | Wide area | Gbps-class | High | AGVs, private networks, video |
| MQTT / CoAP | Runs over any IP link | Lightweight | — | Cloud and platform integration |
How to Choose
Start from the data profile: how much data, how often, and how quickly must it arrive? A vibration sensor sending a few bytes a minute belongs on LoRaWAN or BLE;
