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CCC · Radio networks & DIYCurated

MeshCore on 868 MHz: A decentralised radio network without the internet

Summary

Christian Stankowic and CodeSalat show how MeshCore and Meshtastic enable independent text networks and custom mesh bots with inexpensive LoRa hardware. Both projects build decentralised text networks on LoRa radio technology. Under suitable conditions, messages can cover many kilometres across several nodes.

Ideas

  • LoRa combines low data rates with long range and low energy requirements.
  • MeshCore and Meshtastic carry short messages without a mobile network or internet access.
  • Relaying nodes increase the range and resilience of a community radio network.
  • Inexpensive microcontroller boards make it possible to start without classic radio equipment.
  • Smartphones and computers serve as a convenient interface for small independent radio nodes.
  • Custom bots turn text communication into a programmable decentralised infrastructure.
  • Economical repeaters in high places can connect local radio islands over greater distances.
  • MeshCore and Meshtastic use LoRa, but not the usual LoRaWAN network stack.

Insights

  • Resilient communication comes from many independent nodes rather than from one powerful centre.
  • Extremely scarce bandwidth forces understandable protocols and a conscious approach to every message.
  • Open firmware turns licence-free radio bands into a field for experiments that the community can extend.
  • Range is less a product feature than the result of antenna, location and network structure.

Quotes

  • Meshen macht Spaß (“Meshing is fun”) – Christian Stankowic and CodeSalat

Habits

  • The speakers combine an explanation of the protocol, an overview of the hardware and a mesh bot they programmed themselves.

Facts

  • Both projects build decentralised text networks on LoRa radio technology.
  • Under suitable conditions, messages can cover many kilometres across several nodes.
  • Among other things, MeshCore supports companion nodes, repeaters and programmable applications.

Critique

  • Real range and reliability depend heavily on terrain, antennas, interference and node density.
  • Without drills, energy planning and fallback paths, an experimental mesh is no substitute for emergency communication.

Remarks

  • The talk description mentions LoRaWAN; technically, MeshCore and Meshtastic use their own protocols on top of LoRa.
  • The topic takes the earlier 433 MHz experiments with radio sockets further towards bidirectional data networks.

References

Recommendations

  • Start with two compatible nodes and check direct communication before expanding the mesh.
  • Document firmware, keys, frequency parameters and locations reproducibly.
  • Measure range, packet loss and battery life under realistic conditions.
  • Observe the frequency plan, transmit power and duty cycle of the radio rules that apply to you.

Watch the talk

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