feat(kerykeion): serial/TCP transport, frame codec, AES-CTR encryption, config handshake#56
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forkwright merged 3 commits intomainfrom Mar 19, 2026
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…n, config handshake Implements the Meshtastic serial protocol layer in the kerykeion crate: - codec.rs: tokio_util Decoder/Encoder with 4-byte frame header (0x94 0xC3 MSB LSB), magic seeking, max-512-byte enforcement, zero-length and back-to-back frame handling (10 tests) - transport/serial.rs: SerialTransport at 115 200 baud, no flow control, DTR/RTS false to avoid firmware reboot on connect, exponential backoff reconnect (1 s → 30 s cap) - transport/tcp.rs: TcpTransport on default port 4403, 3 s connect timeout, same Meshtastic framing (2 tests) - transport/mod.rs: ConnectionHandle enum dispatch (Serial | Tcp) for non-dyn-compatible async-fn traits; connect() factory - handshake.rs: config handshake state machine — sends want_config_id, receives MyNodeInfo / NodeInfo / Channel / config_complete_id, 10 s timeout, discards in-flight MeshPackets, fails on Rebooted (3 tests) - crypto.rs: AES-128/256-CTR via ctr crate; nonce layout matches Meshtastic firmware; PSK expansion for 1-byte shorthands; multi-channel decrypt with protobuf probe (15 tests) - heartbeat.rs: 30 s keepalive loop driven by CancellationToken, empty ToRadio as keepalive signal (2 tests) Also updates connection.rs to use proto types (ToRadio/FromRadio), adds From<io::Error> to Error for tokio_util codec trait bounds, and exposes new modules in lib.rs. Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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Consider splitting into smaller PRs for easier review. Not a blocker, just a signal. |
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Summary
tokio_utilDecoder/Encoder with 4-byte Meshtastic frame header (0x94 0xC3 MSB LSB), magic seeking on corrupt input, max-512-byte enforcement, zero-length and back-to-back frame handlingSerialTransport(115 200 baud, DTR/RTS false, exponential backoff reconnect) andTcpTransport(port 4403, 3 s connect timeout);ConnectionHandleenum dispatch bridges the non-dyn-compatible async-fn traitwant_config_id, collectsMyNodeInfo/NodeInfo/Channelmessages, completes on matchingconfig_complete_id, 10 s timeoutctrcrate; nonce layout matches Meshtastic firmware (packet_id as u64 LE || from_node u32 LE || 0x00000000); PSK expansion for 1-byte shorthands; multi-channel decrypt with protobuf probeCancellationToken; uses emptyToRadio(no payload variant) as the keepalive signal — the vendored proto has no dedicatedHeartbeatmessage type61 tests in kerykeion, all passing.
cargo clippy --workspace --all-targets -- -D warningsclean.Notes
Box<dyn MeshConnection>is not viable becauseasync fnin traits (Rust 2024) is not object-safe.ConnectionHandleenum dispatch is the idiomatic alternative.mesh.protodoes not defineConfigorModuleConfigmessages, soHandshakeResultcarries onlychannels: Vec<Channel>from the dump.ToRadio { payload_variant: None }is used as the heartbeat keepalive since no dedicated message type exists in the proto.Test plan
cargo test -p kerykeion— 61 tests passcargo test --workspace— 418 tests pass, 0 failurescargo clippy --workspace --all-targets -- -D warnings— 0 warningscargo fmt --all— no diffs🤖 Generated with Claude Code