---
phase: 11.1-proximity-sensor-app-compatibility-fix
plan: 01
subsystem: driver
tags: [openvr, spike, proximity, pipe-command, UpdateBooleanComponent]

requires:
  - phase: 11-ipd-pipe-command
    provides: Named pipe infrastructure and HandlePipeCommand dispatch pattern
provides:
  - probe_proximity pipe command probing handles 1-20 with UpdateBooleanComponent
  - test_handle pipe command for targeted handle/value testing
affects: [11.1-02-live-spike-testing]

tech-stack:
  added: []
  patterns: [spike probe commands for runtime handle discovery]

key-files:
  created: []
  modified:
    - src/driver/device_provider.h
    - src/driver/device_provider.cpp

key-decisions:
  - "Response buffer increased from 256 to 512 bytes to accommodate probe_proximity output for 20 handles"
  - "Probe uses false (not true) to avoid triggering side effects on unknown components"

patterns-established:
  - "Spike pipe commands: temporary commands for runtime discovery, prefixed with descriptive names"

requirements-completed: [SPIKE-01, SPIKE-02]

duration: 2min
completed: 2026-03-26
---

# Phase 11.1 Plan 01: Spike Probe Pipe Commands Summary

**probe_proximity and test_handle pipe commands for discovering lighthouse driver's /proximity input component handle via UpdateBooleanComponent**

## Performance

- **Duration:** 2 min
- **Started:** 2026-03-26T12:10:58Z
- **Completed:** 2026-03-26T12:12:55Z
- **Tasks:** 2
- **Files modified:** 2

## Accomplishments
- Added probe_proximity command that probes handles 1-20 with UpdateBooleanComponent(false) and reports error codes
- Added test_handle command for targeted boolean component testing with arbitrary handle/value
- Built and deployed updated driver DLL to SteamVR driver package

## Task Commits

Each task was committed atomically:

1. **Task 1: Add probe_proximity and test_handle pipe commands** - `e221b25` (feat)
2. **Task 2: Deploy built DLL to driver package** - No git commit (deployment action only, copies build output to external SteamVR path)

## Files Created/Modified
- `src/driver/device_provider.h` - Added HandleProbeProximity and HandleTestHandle declarations
- `src/driver/device_provider.cpp` - Added command dispatch, probe loop (handles 1-20), and test_handle implementation

## Decisions Made
- Increased response buffer from 256 to 512 bytes to fit probe_proximity output for 20 handles
- Probe uses `false` value per plan (avoid triggering side effects on unknown components)

## Deviations from Plan

### Auto-fixed Issues

**1. [Rule 3 - Blocking] CMake build directory not configured in worktree**
- **Found during:** Task 1 (build verification)
- **Issue:** Worktree had no build/ directory -- cmake configure needed before build
- **Fix:** Ran cmake -B build -G "Visual Studio 17 2022" -A x64 to configure
- **Files modified:** build/ (generated, not tracked)
- **Verification:** Build succeeded with zero errors
- **Committed in:** N/A (build artifacts not tracked)

---

**Total deviations:** 1 auto-fixed (1 blocking)
**Impact on plan:** Build configuration is standard worktree setup. No scope creep.

## Issues Encountered
None

## User Setup Required
None - no external service configuration required.

## Next Phase Readiness
- Driver DLL deployed to SteamVR driver package with probe_proximity and test_handle commands
- Ready for Plan 02's live spike testing (restart SteamVR, send pipe commands, analyze results)

---
*Phase: 11.1-proximity-sensor-app-compatibility-fix*
*Completed: 2026-03-26*