Rewair

Custom drop-in firmware work for reviving original Awair Element units by replacing the EMW3165 radio-module firmware.

What's inside of the Element?

• ST STM32F103VET6 — sensor board MCU
• ST STM32F103RBT6 — front panel daughterboard MCU
• Glead ZYM-BI201 — BLE 4.0 (TI CC2540, originally used for BLE GATT pairing)
• MXCHIP EMW3165 — WiFi module (has STM32F411 + Broadcom WiFi inside, the main interest of this repo)
• a bunch of sensors (Telaire T6703, Sharp GP2Y10, FIS QS-01, SHT30)

Repository Layout

• wiced/apps/rewair/local_bridge: WICED 3.3.1 app currently used for radio bring-up and F103 UART protocol work.
• wiced/platforms/AWAIR: Awair/EMW3165 WICED platform pin map.
• scripts: wrappers for syncing into the external WICED SDK, building, and flashing.
• tools/f103_debug: SWD/GDB helpers for F103-side protocol tracing.
• tools/emw3165_sensor_console: small bare-metal F411 fallback console used before WICED networking was working.
• docs: status and compatibility notes.

Generated build output, local lab artifacts, and the WICED SDK are intentionally not tracked here.

External Dependencies

Expected sibling checkout layout from the original workspace:

awair/
  rewair/
  third_party/wiced-emw3165/

The WICED SDK fork is currently expected at:

../third_party/wiced-emw3165

Override with SDK_DIR=/path/to/wiced-emw3165 if needed.

Build

scripts/build_local_bridge.zsh

This syncs wiced/apps/rewair and wiced/platforms/AWAIR into the external SDK, then builds:

rewair.local_bridge-AWAIR-FreeRTOS-LwIP-SDIO

Flash

Located on the opposite side of EMW3165 are 4 test points. TP103/TP104 is the debug USART, TP80/TP81 is SWD.

scripts/flash_local_bridge_probe_rs.zsh

By default this flashes the WICED bootloader and app, but preserves DCT/Wi-Fi credentials. To intentionally wipe/reseed DCT:

FLASH_DCT=1 scripts/flash_local_bridge_probe_rs.zsh

Current State

See docs/status.md. Short version: Wi-Fi, DCT credential persistence, DHCP, SNTP, time sync, and basic F103 frame TX/RX are in place. The current unresolved issue is that under WICED the F103 emits REDY/TEST, then often stops sending SENS.

Without Wi-Fi connected the sensor board reliably (more or less) sends data to the radio module every 5 seconds.