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21 lines
1.2 KiB
Markdown
21 lines
1.2 KiB
Markdown
# Meshtastic backend
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[Meshtastic](https://meshtastic.org) protocol backend for the mesh service (`mesh-module`). It registers itself with
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`mesh_backend_register()` as `meshtastic`. It has a GPL-3.0 license, and none of its headers are part of the app SDK.
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Supported:
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- The LongFast preset (SF11, 250 kHz, CR 4/5, sync word 0x2B), in the frequency slot that the primary channel's
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name selects within the region's band, like Meshtastic does.
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- Channels: the primary channel is preconfigured as "LongFast" with the default key. More channels can be added with
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`mesh_set_channel()`, with a 1-byte PSK index, or a 16 or 32-byte key.
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- Text messages on channels, and direct messages to and from nodes. Direct messages request an acknowledgement and
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received ones are acknowledged.
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- NodeInfo: sent at start and every 3 hours, received NodeInfo provides node names.
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The node number is random and stored in the backend's data directory. The node doesn't rebroadcast packets for
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others (like the CLIENT_MUTE role).
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Not implemented: public key (PKI) encryption of direct messages, other modem presets, positions and telemetry.
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Direct messages are encrypted with the primary channel's key, which current firmware still accepts.
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