Wire-incompatible break with the 0.x protocol. Every host-side path (UART, USB CDC, framing, radio dispatcher, display update channel) speaks the v2 wire format defined in PROTOCOL.md.
* Replace the host framing path with streaming FrameDecoder + encode_frame from donglora-protocol, matching the new (type_id, tag, payload) shape.
* Update src/channel.rs and src/host/{uart,usb,framing}.rs for the new frame semantics: per-request tag echo, CRC checked in the decoder, async ERR fan-out on tag 0.
* Rework src/radio.rs to emit RX / TX_DONE / OK / ERR messages in v2 shape, including RxOrigin, TxDonePayload, and SetConfigResult codes.
* Update src/protocol.rs glue to re-export v2 types from donglora-protocol and drop the legacy 0.x shim surface.
* Refresh PROTOCOL.md to the v2 normative spec (kept in sync with the donglora-protocol crate).
* Minor display and main-loop cleanups needed for the new radio event shape.
Pulls the wire protocol types and COBS framing out of firmware and into
the sibling ../protocol crate so client-rs, mux-rs, and bridge can share
them. Firmware's src/protocol.rs is now a thin re-export shim preserving
every crate::protocol::\* call site; src/host/framing.rs drops the
in-tree CobsDecoder / cobs_encode_response and re-exports the codec,
keeping only route_command (which needs embassy channels).
All seven board features still build clean, cargo fmt clean, cargo test
green.
- heltec_v3 now uses USB OTG (requires hardware mod: solder R29/R3)
- heltec_v3_uart added as fallback for stock boards
- Removed every #[allow(dead_code)] — fixed root causes instead:
- Comm types (UsbParts/UartParts) moved to individual board files
- USB/UART init removed from hal (boards call esp-hal directly)
- SH1106 driver gated on boards that use it
- UART task sends DisplayCommand::Reset at startup (variant now used)
- ErrorCode::CrcError removed (SX1262 drops bad-CRC silently)
- check/clippy now use --release (no more Xtensa dev-mode warnings)
- Updated README with hardware mod docs and board table
swaits