DongLoRa Firmware

Embedded Rust firmware for DongLoRa boards. Exposes the LoRa radio over USB CDC-ACM using a COBS-framed binary protocol.

Building

just setup              # one-time toolchain install
just build heltec_v4    # build for a specific board
just flash heltec_v4    # build + flash
just check-all          # compile-check all boards
just clippy heltec_v4   # lint
just test               # host-side protocol unit tests

All commands are run from the firmware/ directory.

Supported Boards

Board	MCU	Radio	Target
Heltec V3	ESP32-S3	SX1262	xtensa-esp32s3-none-elf
Heltec V4	ESP32-S3	SX1262	xtensa-esp32s3-none-elf
RAK WisBlock 4631	nRF52840	SX1262	thumbv7em-none-eabihf

Adding a Board

See src/board/PORTING.md.

Protocol

See PROTOCOL.md for the complete wire format specification.