What is Meshtastic and how does it work?

LoRa vs Meshtastic: radio vs software

LoRa is a radio modulation. It trades speed for range and low power, and it works in licence-free bands (868 MHz in Europe, 915 MHz in the US). By itself it is only a way to send bits.

Meshtastic is the software on top. It adds the mesh: message formats, encryption, node lists, GPS sharing, and the rule for who repeats what. It runs on many boards from Heltec, LilyGO, RAK, Seeed and others. Browse them in the device list or use the device finder.

How does a Meshtastic mesh work?

You send a message from your phone to your radio over Bluetooth. The radio broadcasts it on the air. Any radio in range that hears it can repeat it once, and that is how a message goes further than one radio can reach.

Meshtastic calls this managed flooding. A node cancels its own rebroadcast if it hears someone else already rebroadcast the same packet first, and farther nodes with weaker signal tend to rebroadcast first. This keeps the air from filling with copies. Direct messages learn a next hop after the first delivery from firmware 2.6 on, and fall back to flooding if that fails (Meshtastic mesh algorithm docs).

Every packet has a hop limit. The default is 3 and the maximum is 7, and each relay lowers the count. The docs say "Really, 3 is fine", because more hops mean more traffic on a shared channel. Which nodes relay depends on their role.

What can you use Meshtastic for?

The official introduction describes off-grid communication where cellular or Wi-Fi is unavailable or unreliable. Typical uses:

• Hiking, skiing, cycling and camping groups that want to text and see each other on a map.
• Events, festivals and farms where coverage is poor.
• A neighbourhood or city mesh built from rooftop and window nodes.
• Emergency backup when networks are down.
• Trackers for vehicles, pets or equipment, using nodes with GPS.

What Meshtastic cannot do

• No voice calls. Messages are small. At the default LONG_FAST preset the raw data rate is about 1,070 bits per second (see presets).
• No photos or large files.
• Limited traffic. All nodes share the same channel, and each message occupies the air for a measurable time. Too many chatty nodes slow everyone down.
• Range is not guaranteed. Distance depends on antenna height and obstacles far more than on the board. The Meshtastic introduction cites a 331 km record without describing the conditions. Use the range calculator for realistic numbers.
• One phone connection at a time per radio.

Is it encrypted and legal?

Channels are encrypted with a pre-shared key, but the default public key is published, so the default channel is not private. Details are in the encryption guide. Radio rules depend on your country, because power limits and duty cycles differ. Read is Meshtastic legal and frequencies by country before you switch on.

What does it cost to start?

You need a radio board, an antenna, a battery and a phone. A bare Heltec V3 or V4 board costs about $17.9 (Heltec store, Nov 5, 2026) or $17.9 (Heltec store, Nov 5, 2026), but it has no case or battery. A ready-to-carry nRF52 handheld costs more; for example the Heltec MeshPocket is $49 (Heltec store, Nov 5, 2026). Two nodes are the minimum to test a link. Buy the version for your region's band.