BLE remote for Wahoo Headwind using embassy-rs/nrf-softdevice.

Cycles modes and speed setpoint in sync with front-panel/App control. The system works from my reverse engineering the simple BLE protocol with WireShark. It's not perfect; the protocol state notify is cyclic rather than actual notify so can represent an old state rather than expected setpoint. The remote handles this well enough for this task though.

• nRF52840 board (using nRF52840dk) or Feather nRF52840 (will require JLink); can be ported to other nrf5XXXX but these are my targets.
• NeoKey Wing for final assembly and case: --features=feather_neokey.
• cargo install probe-rs -F=cli

1. Download SoftDevice S140 from Nordic's website here. Supported versions are 7.x.x
2. Program SoftDevice with: probe-rs download --chip nrf52840 --format hex s140_nrf52_7.X.X_softdevice.hex
3. Run cargo run

By default the DEFMT_LOG level is 'info' (set in ./cargo/config). For debugging use DEFMT_LOG=debug cargo run.

To flash build: cargo flash --release --chip nRF52840_xxAA.

The default build will scan for BLE devices and use the first device with advertisement data name (0x09) starting with 'HEADWIND' (default Wahoo Headwind name) - the Headwind service UUID is not in advertisement packet unfortunately.

To use a fixed address, change the HEADWIND_ADDR const in './src/main.rs' and use the --features=fixed_addr.

Once connected, the buttons control the Headwind mode:

• Button 1: Next mode = Off -> Heartrate -> Manual .. STEP,100,STEP -> Off.
• Button 2: Previous mode = Off <- Heartrate <- Manual .. 100,STEP,-STEP <- Off.

The current operating mode and speed setpoint are maintained via the notify characteristic so if changed by the front-panel or App, the buttons will cycle from that updated mode.