---
phase: 03-proximity-component-spike
verified: 2026-03-22T00:00:00Z
status: passed
score: 7/7 must-haves verified
re_verification: false
gaps: []
human_verification:
  - test: "Fallback 1 mechanism remains available across driver rebuilds"
    expected: "beyond_prox_ctl fallback1 on/off commands reach TryFallback1() and SetBoolProperty on HMD container behaves as confirmed during spike UAT"
    why_human: "The confirmed-working fallback 1 path is exercised via a runtime command. Cannot verify SteamVR runtime response programmatically — requires live SteamVR session. This was already validated manually per 03-02-SUMMARY.md spike UAT."
---

# Phase 3: Proximity Component Spike Verification Report

**Phase Goal:** A /proximity boolean component on the sidecar driver triggers SteamVR standby/wake for the lighthouse-owned HMD device
**Verified:** 2026-03-22
**Status:** PASSED
**Re-verification:** No — initial verification

## Spike Context: Primary vs. Fallback Outcome

The primary approach (`/proximity` boolean component on a `GenericTracker` device) was confirmed NOT to affect HMD standby/wake — it only prevents the sidecar tracker itself from sleeping. The spike proceeded to Fallback 1 (`SetBoolProperty(hmdContainer, Prop_ContainsProximitySensor_Bool, true/false)` on the HMD's own property container) and that approach was confirmed WORKING by the user during manual UAT. The phase goal — finding a mechanism by which the sidecar driver can trigger standby/wake for the lighthouse-owned HMD — is therefore ACHIEVED. The discovery that the working mechanism differs from the originally hypothesized one is the expected outcome of a feasibility spike.

---

## Goal Achievement

### Observable Truths

| # | Truth | Status | Evidence |
|---|-------|--------|---------|
| 1 | Driver creates /proximity boolean component during Activate() | VERIFIED | `proximity_device.cpp` line 43-52: `VRDriverInput()->CreateBooleanComponent(props, "/proximity", &m_proximityHandle)` with logging |
| 2 | Driver toggles proximity state via named pipe commands from CLI tool | VERIFIED | `device_provider.cpp` HandlePipeCommand handles "proximity on/off/status"; calls `m_pDevice->SetProximity(bool)` |
| 3 | beyond_prox_ctl CLI tool connects to driver pipe and sends proximity on/off/status commands | VERIFIED | `src/ctl/main.cpp` complete implementation: validates commands, CreateFileA to pipe, WriteFile command, ReadFile response |
| 4 | Named pipe polling in RunFrame() is non-blocking (PIPE_NOWAIT) | VERIFIED | `device_provider.cpp` line 94: `PIPE_TYPE_MESSAGE \| PIPE_READMODE_MESSAGE \| PIPE_NOWAIT`; RunFrame() calls only PollPipe() |
| 5 | ShouldBlockStandbyMode() returns false | VERIFIED | `device_provider.cpp` lines 76-79: `return false;` — does not interfere with standby testing |
| 6 | Fallback 1 (SetBoolProperty on HMD container) is implemented and reachable via pipe commands | VERIFIED | `device_provider.cpp` TryFallback1() implemented (lines 228-242); reachable via "fallback1 on/off" pipe commands; confirmed WORKING by manual UAT |
| 7 | Verification script exists with feasibility gate output | VERIFIED | `scripts/verify_proximity.ps1` exists, 255 lines, contains Test-Check, FEAS-03, INTG-01, Manual UAT Procedure, beyond_prox_ctl references |

**Score:** 7/7 truths verified

---

### Required Artifacts

| Artifact | Expected | Status | Details |
|----------|----------|--------|---------|
| `src/driver/proximity_device.h` | `VRInputComponentHandle_t m_proximityHandle`, SetProximity/GetProximity | VERIFIED | Line 25: `m_proximityHandle = vr::k_ulInvalidInputComponentHandle`; lines 12-13: method declarations present |
| `src/driver/proximity_device.cpp` | CreateBooleanComponent with /proximity, UpdateBooleanComponent | VERIFIED | Lines 43-52: CreateBooleanComponent; lines 92-93: UpdateBooleanComponent in SetProximity(); Prop_ContainsProximitySensor_Bool set line 55-56 |
| `src/driver/device_provider.h` | `HANDLE m_hPipe`, `bool m_bClientConnected` | VERIFIED | Lines 28-29: both members present; fallback method declarations also present (lines 37-42) |
| `src/driver/device_provider.cpp` | CreateNamedPipeA, PIPE_NOWAIT, PollPipe in RunFrame, ShouldBlockStandbyMode false | VERIFIED | Lines 91-108 CreatePipeServer; line 94 PIPE_NOWAIT; line 73 RunFrame calls PollPipe; line 78 returns false |
| `src/ctl/main.cpp` | beyond_proximity_ctl pipe name, CreateFileA, PIPE_READMODE_MESSAGE, command validation | VERIFIED | Line 15: PIPE_NAME constant; line 53: CreateFileA; line 73-74: PIPE_READMODE_MESSAGE; lines 37-50: command validation |
| `CMakeLists.txt` | `add_executable(beyond_prox_ctl` target | VERIFIED | Lines 65-67: target defined with `src/ctl/main.cpp` |
| `scripts/verify_proximity.ps1` | Test-Check function, 100+ lines, FEAS-03, INTG-01, beyond_prox_ctl | VERIFIED | 255 lines; Test-Check at line 28; FEAS-03 at line 237; INTG-01 at line 235; beyond_prox_ctl references throughout |

All 7 artifacts: VERIFIED (Exists + Substantive + Wired)

---

### Key Link Verification

| From | To | Via | Status | Details |
|------|----|-----|--------|---------|
| `device_provider.cpp` | `proximity_device.cpp` | `RunFrame() -> PollPipe() -> HandlePipeCommand() -> m_pDevice->SetProximity(bool)` | WIRED | HandlePipeCommand lines 151/157 call `m_pDevice->SetProximity(true/false)` |
| `src/ctl/main.cpp` | `device_provider.cpp` | Named pipe `\\.\pipe\beyond_proximity_ctl` | WIRED | Both use identical string `"\\\\.\\pipe\\beyond_proximity_ctl"` — driver at line 92, CLI at line 15 |
| `proximity_device.cpp` | `openvr_driver.h` | `VRDriverInput()->CreateBooleanComponent` and `UpdateBooleanComponent` | WIRED | CreateBooleanComponent line 43; UpdateBooleanComponent line 92 |
| `device_provider.cpp` | HMD property container | `TryFallback1() -> VRProperties()->SetBoolProperty(hmdProps, Prop_ContainsProximitySensor_Bool, on)` | WIRED | Lines 232-238: TrackedDeviceToPropertyContainer(k_unTrackedDeviceIndex_Hmd) then SetBoolProperty |
| `src/ctl/main.cpp` | `device_provider.cpp` (fallback commands) | `"fallback1 on/off"` pipe commands | WIRED | CLI lines 40-45 validate fallback1/2/3 commands; driver HandlePipeCommand lines 167-196 handle them |

All 5 key links: WIRED

---

### Requirements Coverage

| Requirement | Source Plan | Description | Status | Evidence |
|-------------|------------|-------------|--------|---------|
| FEAS-03 | 03-01-PLAN.md, 03-02-PLAN.md | Sidecar driver's `/proximity` component triggers SteamVR standby/wake for lighthouse-owned HMD | SATISFIED (via Fallback 1) | Primary `/proximity` on GenericTracker confirmed non-functional for HMD standby. Fallback 1 (SetBoolProperty on HMD container) confirmed WORKING via manual UAT per 03-02-SUMMARY.md. Both mechanisms implemented and accessible in current codebase. Spike goal achieved. |
| INTG-01 | 03-01-PLAN.md, 03-02-PLAN.md | Driver creates `/proximity` boolean component via `IVRDriverInput::CreateBooleanComponent` | SATISFIED | `proximity_device.cpp` lines 43-52 implement this exactly. vrserver log line `"Created /proximity component (handle 4294967297)"` confirmed in 03-02-SUMMARY.md spike results. |

No orphaned requirements: REQUIREMENTS.md traceability table maps FEAS-03 and INTG-01 to Phase 3 only, and both plans claim them.

---

### Anti-Patterns Found

| File | Line | Pattern | Severity | Impact |
|------|------|---------|----------|--------|
| `proximity_device.cpp` | 72 | `// No subcomponents in Phase 1; /proximity added in Phase 3` comment in `GetComponent()` returning `nullptr` | Info | Stale comment. GetComponent returning nullptr is correct behavior; comment text is outdated but does not affect runtime behavior. |

No blockers. No stub implementations. No TODO/FIXME markers in modified files. No empty handlers. No console.log-only functions.

---

### Human Verification Required

#### 1. Fallback 1 path through live SteamVR

**Test:** With SteamVR running and Beyond 2 connected, run `beyond_prox_ctl.exe "fallback1 on"` then observe SteamVR dashboard behavior over 30 seconds.
**Expected:** Dashboard remains positioned without resetting (identical to spike UAT result from 03-02-SUMMARY.md).
**Why human:** SteamVR runtime behavior in response to SetBoolProperty on HMD container cannot be verified programmatically. This was already confirmed once during the spike UAT — this note is only for regression awareness in future builds.

Note: This human verification item does NOT block the phase from passing. The UAT was already performed and documented in 03-02-SUMMARY.md. It is captured here for traceability only.

---

### Gaps Summary

No gaps. All automated checks pass. The phase goal — identifying a working mechanism for the sidecar driver to trigger standby/wake on the lighthouse-owned HMD — is achieved. The fallback 1 approach (writing `Prop_ContainsProximitySensor_Bool` to the HMD property container) is fully implemented in the codebase, is accessible via the `beyond_prox_ctl` CLI tool, and was manually confirmed working by the user.

The deviation from the original plan (primary approach failed, fallback approach succeeded) is a documented and acceptable outcome for a feasibility spike. The working mechanism is available for Phase 6 to wire to the full HID proximity pipeline.

---

**Notable for Phase 6 planning:** The actual SteamVR standby/wake trigger is `TryFallback1()` in `device_provider.cpp`, not the `/proximity` component update on `ProximityDevice`. Phase 6 should call `TryFallback1()` (or inline the equivalent) when person_detected state changes, not merely `m_pDevice->SetProximity()`.

---

_Verified: 2026-03-22_
_Verifier: Claude (gsd-verifier)_