The MCU changed from ESP32 Dev Board to a Seeed Studio XIAO ESP32-C6,
but the firmware still targeted esp32dev. Retarget it and fix the
build so it compiles and flashes for the C6.
platformio.ini:
- env esp32-mqtt -> seeed_xiao_esp32c6 on the pioarduino platform fork
(mainline espressif32 lags the Arduino-core 3.x the C6 needs)
- add ARDUINO_USB_MODE=1 / ARDUINO_USB_CDC_ON_BOOT=1 for Serial over
the C6 native USB
- fix build_src_filter ordering in BOTH envs: -<*.cpp> ran last and
re-excluded the target, leaving setup()/loop() undefined at link
esp32-mqtt-bridge.cpp:
- UART Serial2 RX16/TX17 -> Serial1 RX=D7/TX=D6 (XIAO C6 mapping)
- status LED GPIO2 -> D1 (green channel of the RGB STAT LED)
- fix pre-existing ArduinoJson v7 / PubSubClient build errors
(.c_str() on a const char*, String topic where const char* required)
Verified: builds clean and boots on hardware (native-USB serial banner
confirmed).
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Complete rewrite of firmware into two dedicated boards per camera node:
ESP8266 (Camera Bridge):
- Connects ONLY to GoPro AP — polls status, sends over UART
- Zero network switching, zero MQTT
- HTTP GET /bacpac/SH for status, start/stop
- JSON-per-line UART protocol to ESP32
ESP32 (MQTT Bridge):
- Connects ONLY to travel router — MQTT to Pi hub
- Reads status from ESP8266 over UART2 (RX16/TX17)
- Auto-registration, heartbeat, command forwarding
- Zero camera communication
UART Protocol: JSON-per-line at 115200 8N1
ESP8266→ESP32: status/ack/pong/error
ESP32→ESP8266: cmd (start_recording/stop_recording/ping)
Hardware updates:
- BOM now includes both boards (~4/node)
- 3D case has stacked dual-board compartment
- UART wire channel between board recesses
- Shared 3.3V power rail for both boards
Joshua King
Hermes