ESP32-C3FH4 OTA Relay

Complete firmware for ESP32-C3FH4 acting as OTA relay between APP/PC and GD32E508VET6.

Build

export IDF_PATH=/path/to/esp-idf
source $IDF_PATH/export.sh
mkdir build && cd build
cmake ..
make

Structure

main/
  main.c           - Entry point, task creation
  app_main.c       - Application init, system monitor task
  ota_relay.c      - 4-stage OTA state machine
  spi_master.c     - SPI2 (VSPI) master driver
  protocol.c       - Frame format, CRC16, AES, scramble
  wifi_ota.c       - WiFi AP/STA + HTTP server
  ble_ota.c        - BLE GATT server
  health_monitor.c - Temperature/voltage/WiFi monitoring

Features

WiFi AP mode (SSID: ESP32_OTA_RELAY, pw: 12345678)
BLE GATT OTA service
HTTP POST /ota/upload for firmware
SPI to GD32 (40MHz, GPIO4-9)
Flash storage with断点续传
System health monitoring

TODO (confirm with GD32 team)

MASTER_KEY_HERE - AES-128 master key (16 bytes)
SCRAMBLE_CONST_HERE - scramble algorithm seed
CHIP_UID_HERE - GD32 chip unique ID
GATT UUIDs for OTA service