# donglora-protocol

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Wire protocol types and COBS framing for [DongLoRa], shared between the
firmware and host crates (`client-rs`, `mux-rs`, `bridge`). `no_std`,
zero-alloc, fixed-width little-endian. See [`PROTOCOL.md`][protocol-md]
in this repo for the normative DongLoRa Protocol v2 specification.

[DongLoRa]: https://github.com/donglora
[protocol-md]: https://github.com/donglora/protocol-rs/blob/main/PROTOCOL.md

## Install

```toml
# Embedded / firmware (defmt::Format derives on by default):
donglora-protocol = "1"

# Host (no defmt):
donglora-protocol = { version = "1", default-features = false }
```

## Layout

- `src/frame.rs`: `FrameDecoder` (streaming COBS + CRC decoder) and
  `encode_frame(type_id, tag, payload, out)`.
- `src/commands.rs`: host-to-device `Command` enum, `type_id`
  constants, and `TxFlags`.
- `src/events.rs`: device-to-host `DeviceMessage` (OK / ERR / RX /
  TX_DONE), with the `OkPayload`, `SetConfigResult`, `RxPayload`,
  `RxOrigin`, and `TxDonePayload` sub-shapes.
- `src/modulation.rs`: `Modulation` enum (LoRa, FSK/GFSK, LR-FHSS,
  FLRC) and their typed parameter structs.
- `src/info.rs`: `GET_INFO` response payload + capability bitmap
  helpers.
- `src/errors.rs`: wire-level `ErrorCode` enum.
- `src/chip_id.rs`: `RadioChipId` enum.
- `src/crc.rs`: CRC-16/CCITT-FALSE helper.

## Features

| Feature | Default | What it does |
|---------|---------|--------------|
| `defmt` | yes | Derive `defmt::Format` on public enums. |
| `std`   | no  | Enable `Debug`-based niceties for host-side fuzz / proptest. |

## Testing

The crate ships its own quality gate via `just test`:

| Gate | What runs |
|------|-----------|
| `test-unit` | nextest across all feature permutations + doc tests |
| `test-clippy` | `-D warnings` across all feature permutations |
| `test-fmt` | `cargo fmt -- --check` |
| `test-doc` | `cargo doc --no-deps --all-features` |
| `test-deny` | `cargo deny check` |
| `test-fuzz` | 60 s on each of 5 cargo-fuzz targets (nightly) |
| `test-miri` | miri on lib + vector tests, both feature shapes (nightly) |
| `test-mutants` | cargo-mutants under both feature configurations |

The proptest suite alone exercises ~1.13M test cases per run.

## License

MIT — see [`LICENSE`](LICENSE).