# BikeControl

Ride a Van Rysel D100 smart trainer without Zwift. Load a GPX route or a synthetic
waveform profile, and the app drives the trainer's resistance to match — recording
power, speed and distance as you go.

See [REQUIREMENTS.md](REQUIREMENTS.md) for the full specification.

---

## Status

| Component | State |
|-----------|-------|
| `crates/core` — physics, profiles, GPX import, ride engine | Implemented, 103 tests |
| `crates/ble` — FTMS client for the D100 | Implemented, 96 tests. **Not yet wired into the app** |
| `crates/fit` — FIT activity encoder | Implemented, 106 tests. **Not yet wired into the app** |
| `crates/probe` — hardware discovery CLI | **Works against the real trainer** |
| `src-tauri` + `ui` — desktop app | Runs on a **mock rider**, not the real trainer |

The GUI and the trainer are both working, but **not yet connected to each other** — the
app ticks a synthetic rider while `probe` talks to the real hardware. Joining them is the
next step.

---

## Prerequisites

- Rust (built with 1.92) and `cargo-tauri`: `cargo install tauri-cli --version '^2'`
- Node 20+ and npm
- Linux: `webkit2gtk-4.1`, `libsoup-3.0`, and a running Bluetooth stack (BlueZ)

---

## Running the app

### Standalone binary (recommended)

Embeds the frontend, so there is no dev server and nothing to go wrong:

```bash
cd src-tauri
cargo tauri build --debug --no-bundle
cd ..
./target/debug/bikecontrol-app
```

Open straight onto a running ride with the sample GPX loaded:

```bash
BIKECONTROL_DEMO=1 ./target/debug/bikecontrol-app
```

### Development mode (hot reload)

```bash
cd ui && npm install     # required once — skipping this is what causes a black window
cd ../src-tauri
cargo tauri dev
```

> **If the window is black and says "Could not connect to localhost: Connection refused"**,
> the Vite dev server is not running. Either `npm install` was never run in `ui/`, or
> something killed the server. Use the standalone binary above, which has no dev server at
> all.

### Keyboard

| Key | Action |
|-----|--------|
| `↑` / `↓` | Gradient up/down (`Shift` for coarse steps) |
| `0` | Reset gradient trim to zero |
| `Space` | Pause / resume |
| `M` | Cycle control mode |
| `L` | Mark lap |
| `P` | Profile picker |
| `[` / `]` | Adjust target power or resistance |
| `?` | Help overlay |

Every shortcut is mirrored by an on-screen control.

---

## Talking to the trainer

The `probe` CLI is for hardware discovery and diagnosis — it speaks to the trainer
directly, independently of the app.

```bash
cargo build -p bikecontrol-probe

./target/debug/probe scan                        # find fitness machines
./target/debug/probe scan --all --secs 20        # every peripheral
./target/debug/probe inspect --name VANRYSEL     # services, characteristics, capabilities
./target/debug/probe monitor --name VANRYSEL     # live telemetry: raw hex + decoded
./target/debug/probe set --name VANRYSEL sim=4.0 # apply a target, then auto-reset
```

`set` accepts `gradient=<pct>`, `sim=<pct>`, `resistance=<level>` or `power=<watts>`, and
always finishes by zeroing the gradient, dropping resistance to minimum and issuing
Reset + Stop — including on Ctrl-C.

**The trainer only advertises once awake.** Spin the cranks for a few seconds first, or
scans will find nothing.

### What this trainer reports

Confirmed against the hardware:

```
VANRYSEL-HT-2876   DECATHLON, model 355194, firmware 0.108
  Fitness Machine Service (0x1826)
  Zwift custom service     (00000001-19ca-4651-86e5-fa29dcdd09d1)

  Accepts:  SetIndoorBikeSimulationParameters (0x11)   <-- use this for gradient
            SetTargetResistanceLevel (0x04)   range 0..100 step 1
            SetTargetPower (0x05)             range 50..600 W
  Rejects:  SetTargetInclination (0x03)       not advertised
  Notifies: Indoor Bike Data at 4 Hz
```

Note `SetTargetInclination (0x03)` is **not** supported, and its range characteristic
reports only 0–6% with no negatives — so simulation mode is the only usable path for
gradient.

---

## Profiles

Two kinds of ride, both in the same YAML format — see [profiles/](profiles/):

| File | What it does |
|------|--------------|
| `sine-overunders.yaml` | Warm-up ramp, then sinusoidal power over-unders |
| `hill-repeats.yaml` | Distance-based terrain loop, repeats indefinitely |
| `sawtooth-gradient.yaml` | Gradient sawtooth, distance-based |
| `square-resistance.yaml` | Raw resistance intervals, bypassing physics |

Blocks are `constant`, `ramp`, `wave` (sine/square/triangle/sawtooth), `segments` or
`terrain`, each driving the `gradient`, `resistance` or `power` channel over an extent
measured in `seconds` or `metres`:

```yaml
name: Sine over-unders
blocks:
  - { type: ramp, channel: power, from: 100.0, to: 200.0, extent: { seconds: 600.0 } }
  - type: wave
    channel: power
    shape: sine
    midpoint: 240.0
    amplitude: 40.0
    period: { seconds: 120.0 }
    repeats: 8.0
looping: false
```

GPX files are imported directly — [testdata/sample-climb.gpx](testdata/sample-climb.gpx)
is a 3 km climb with realistic GPS elevation noise. Raw GPS elevation is far too noisy to
differentiate into gradients, so import resamples, smooths and clamps before the trainer
ever sees a number.

---

## Development

```bash
cargo test --workspace          # 300+ tests
cargo clippy --workspace --all-targets
cd ui && npm run check          # svelte-check
```

The workspace is deliberately layered so most of it is testable without hardware:

```
crates/core     physics, profiles, GPX, ride state machine — no I/O at all
crates/ble      FTMS client; protocol logic is pure functions over bytes
crates/fit      FIT encoder; round-trip tested against an independent parser
crates/probe    hardware CLI
src-tauri       Tauri shell — owns the ride loop
ui              Svelte 5 + uPlot — renders snapshots, issues intents
```

`crates/core/src/types.rs` is the shared contract between all of them. Change it
deliberately.

The app selects its data source by Cargo feature: `mock-ride` (default) drives a synthetic
rider; `real-session` wraps the real ride engine and needs a live telemetry source.