Extends the bd-66hx serial protocol with two new Orin→ESP32 commands:
CMD_OTA_CHECK (0x10): triggers gitea_ota_check_now(), responds with
TELEM_VERSION_INFO (0x84) for Balance and IO (current + available ver).
CMD_OTA_UPDATE (0x11): uint8 target (0=balance, 1=io, 2=both) — triggers
uart_ota_trigger() for IO or ota_self_trigger() for Balance.
NACK with ERR_OTA_BUSY or ERR_OTA_NO_UPDATE on failure.
New telemetry: TELEM_OTA_STATUS (0x83, target+state+progress+err),
TELEM_VERSION_INFO (0x84, target+current[16]+available[16]).
Wires OTA stack into app_main: ota_self_health_check on boot,
gitea_ota_init + ota_display_init after peripherals ready.
CMakeLists updated with all OTA component dependencies.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
Balance side (uart_ota.c): downloads io-firmware.bin from Gitea to RAM,
computes SHA256, then streams to IO over UART1 (GPIO17/18, 460800 baud)
as OTA_BEGIN/OTA_DATA/OTA_END frames with CRC8 + per-chunk ACK/retry (×3).
IO side (uart_ota_recv.c): receives frames, writes to inactive OTA partition
via esp_ota_write, verifies SHA256 on OTA_END, sets boot partition, reboots.
IO board main.c + CMakeLists.txt scaffold included.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
