Most IoT connectivity discussions centre on Wi-Fi, Bluetooth, 5G, or Ethernet. These are the standards engineers default to because they’re familiar and well-supported. But they all share a problem: they’re optimised for either high bandwidth or short range, and they consume enough power that battery-operated devices need frequent charging or replacement.

LoRaWAN — Long Range Wide Area Network — makes different tradeoffs. Very low power. Very long range. Very low data rates. And those tradeoffs turn out to be exactly right for a huge class of IoT applications: soil sensors in a field that need to report every hour, gas meters across a city that update daily, water level monitors in a river catchment that transmit a few bytes of data every few minutes.

If you’re building something that needs sensors to run for years without maintenance, covering distances that cellular can’t economically serve, LoRaWAN is worth understanding properly.

How LoRaWAN Works

LoRaWAN is an open standard from the LoRa Alliance, built on top of the LoRa radio modulation technique developed by Semtech. The radio uses chirp spread spectrum (CSS) modulation, which spreads the signal across a frequency band in a way that makes it extremely resilient to interference and capable of penetrating buildings, soil, and water. In open outdoor environments, a single LoRaWAN gateway can reach devices 10 to 15 kilometres away. In dense urban areas, reliable range is 1 to 3 kilometres per gateway — still impressive for battery-operated sensors.

The protocol stack separates devices into end nodes (the sensors or actuators) and gateways (the network infrastructure). End nodes transmit small packets — typically 10 to 50 bytes — using one of several spreading factors that trade data rate for range. Slower spreading factors give you longer range at the cost of transmit time; faster ones send data more quickly but with reduced range.

Gateways receive these transmissions and forward them over an IP backhaul (Ethernet, 4G, or Wi-Fi) to a network server. The network server handles deduplication (multiple gateways often receive the same transmission) and routes messages to the application server where your code processes the data.

LoRaWAN operates in unlicensed ISM bands — 868 MHz in Europe, 915 MHz in North America. This means you don’t pay spectrum licensing fees, but you’re subject to duty cycle regulations: in the EU, devices are limited to transmitting for 1% of the time, which is why LoRaWAN is designed for infrequent, small transmissions rather than continuous data streams.

Real-World Deployments

Agriculture is where LoRaWAN has found perhaps its strongest foothold. Soil moisture sensors, weather stations, livestock tracking tags, and irrigation controllers all benefit from the combination of long range and years-long battery life. In a farm context, sensors might need to cover a few square kilometres from a single gateway while running on AA batteries that last two or three years. LoRaWAN handles this routinely; cellular data plans for the same sensor count would cost multiples more.

Utilities and smart cities represent the second major category. Thames Water, Anglian Water, and several other UK utilities have trialled LoRaWAN-based leak detection and flow monitoring. Smart lamppost sensor pods — covering air quality, noise, parking space occupancy, and pedestrian counts — are deployed across various UK councils including Bristol and Manchester using LoRaWAN backhaul. A gateway on each lamppost, or on a roof in each city block, covers the surrounding sensors on a single internet connection.

Building management applications include energy monitoring, temperature logging, CO2 sensing, and occupancy detection. The through-wall penetration of the 868 MHz band means a single gateway can cover a multi-storey building that would require multiple Wi-Fi access points for similar coverage.

Industrial monitoring includes vibration sensors on rotating machinery, fill-level sensors in tanks and silos, and asset tracking within factory or warehouse environments where GPS doesn’t work and Wi-Fi infrastructure isn’t available in every corner.

Getting Started: The Public Network vs Private Network Decision

This is the first decision for any LoRaWAN deployment: use a public network (pay per device) or deploy your own private infrastructure (pay upfront for gateways, zero per-device cost).

The Things Network (TTN) is a community-run global LoRaWAN network with gateways in most UK cities. It’s free to use for non-commercial purposes and has solid coverage in urban areas. For a proof of concept or a small deployment in a city, TTN lets you test without any infrastructure investment.

For commercial deployments, Everynet and Connexin offer managed UK LoRaWAN networks with SLA coverage and commercial terms. Per-device costs are low — typically pennies per device per month — and you’re not responsible for gateway maintenance.

For rural deployments or applications requiring guaranteed coverage, a private network is often the answer. A single LoRaWAN gateway costs between £100 and £500 and covers everything within its radio range. A farm might need two or three gateways to cover 500 acres reliably. The Raspberry Pi-based gateway options (using the RAK2245 or similar HAT) are popular for low-volume private deployments; industrial gateways from Kerlink, Dragino, or RAK Wireless are appropriate for anything production-critical.

Practical Limitations

The low data rate is a genuine constraint, not just a spec footnote. If you need to send more than a few hundred bytes per transmission, or transmit more than a few times per hour, LoRaWAN isn’t the right choice. Video, audio, and high-frequency telemetry all need a different protocol — 4G or 5G for wide-area, Wi-Fi or Ethernet for local.

Security in LoRaWAN is handled through AES-128 encryption and device activation keys, but implementations vary. OTAA (Over-the-Air Activation) is significantly more secure than ABP (Activation By Personalisation) and should be the default for any production deployment.

Debugging LoRaWAN issues is harder than debugging Wi-Fi. Radio propagation is unpredictable, interference sources aren’t always obvious, and a sensor that works in testing sometimes fails in the field due to local obstructions. Budget time for site surveys and consider deploying redundant gateways in critical areas to avoid single points of failure.

For the applications it’s designed for, LoRaWAN is hard to beat. A sensor that runs for five years on two AA batteries, transmits data across an open field to a gateway on a farm building, and costs under £30 per node is genuinely transformative for what’s economically viable in industrial and agricultural monitoring.