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What is LoRa Mesh Networking?

LoRa mesh networking lets people communicate over radio without any internet connection, cell towers, or central infrastructure. It works by linking together a collection of small, affordable radio devices —— each one can receive a message and pass it along to others, forming a self-organizing mesh.

The basics

  • LoRa (Long Range) is a radio modulation technology designed for sending small amounts of data over long distances at very low power.
  • Mesh networking means there is no single hub. Any device can relay messages to any other device, and the network routes around failures automatically.
  • 915 MHz ISM band is the license-free frequency used in the US and Canada. No amateur radio license is required to operate.

How a message travels

  1. You type a message on your smartphone and send it via Bluetooth to your LoRa device.
  2. Your device broadcasts the message over radio.
  3. Nearby devices receive it and —— depending on the protocol —— relay it onward toward the destination.
  4. The message arrives at the recipient's device and is delivered to their phone via Bluetooth.

The network is entirely infrastructure-independent. It operates whether or not the internet is up, whether or not cell towers are functioning, and whether or not there is power at a central location.

What it is good for

  • Off-grid and backcountry communication
  • Neighborhood and community coordination
  • Communication during disasters or outages
  • Privacy-conscious messaging without carrier involvement
  • Experimenting with decentralized communications

Limitations to understand

  • Low data rate —— LoRa is designed for short text messages, not voice, video, or large files.
  • Range depends on terrain —— line-of-sight from elevation is ideal. Ground level in a city may give just a few hundred meters; hilltop to hilltop can reach 20+ miles.
  • Coverage requires community —— the network only exists where people have deployed devices. In low-density areas you may be starting from scratch.
  • Not a replacement for emergency services —— always call 911 in an emergency.
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