# mcbluetooth-esp32

ESP32 Bluetooth test harness MCP server — UART-controlled peripheral for automated E2E Bluetooth testing.

## Overview

This project turns an ESP32 into a programmable Bluetooth peripheral that can be controlled via MCP (Model Context Protocol). Combined with [mcbluetooth](https://github.com/supported-systems/mcbluetooth) (Linux BlueZ MCP server), it enables fully automated end-to-end Bluetooth testing orchestrated by an LLM.

```
┌─────────────────────────────────────────────────────────────────┐
│                    LLM (Claude, etc.)                           │
│              Orchestrates both MCP servers                      │
└─────────────────────────┬───────────────────────────────────────┘
                          │
          ┌───────────────┴───────────────┐
          │                               │
  ┌───────┴───────┐               ┌───────┴────────┐
  │  mcbluetooth  │               │mcbluetooth-esp32│
  │   (bt_* tools)│               │ (esp32_* tools) │
  └───────┬───────┘               └───────┬────────┘
          │                               │
    D-Bus/BlueZ                     Serial/UART
          │                               │
  ┌───────┴───────┐               ┌───────┴────────┐
  │   Linux Host  │◄── Bluetooth ──►│     ESP32      │
  │    (hci0/1)   │    (over air)   │  (peripheral)  │
  └───────────────┘               └────────────────┘
```

## ESP32 Capabilities

The ESP32 can emulate various Bluetooth devices for testing:

| Capability | Description |
|------------|-------------|
| **Classic BT Pairing** | All 4 SSP modes: Just Works, Numeric Comparison, Passkey Entry, Legacy PIN |
| **SPP (Serial Port)** | Bidirectional data transfer over Classic Bluetooth virtual serial port |
| **HID Device** | Keyboard/mouse combo emulation over Classic Bluetooth |
| **BLE GATT Server** | Dynamic service/characteristic creation at runtime |
| **Device Personas** | Presets for headset, speaker, keyboard, sensor, phone |
| **IO Capabilities** | Configurable: `no_io`, `display_only`, `display_yesno`, `keyboard_only`, `keyboard_display` |
| **Event Reporting** | Real-time events: pair_request, pair_complete, spp_data, hid_connect, gatt_read, gatt_write |

### Hardware Requirements

- **Original ESP32** (ESP32-D0WD or similar) — must have Classic Bluetooth support
- ESP32-S3, C3, H2, S2 will NOT work (no BR/EDR radio)
- USB cable for serial communication

### Verified Hardware

| Property | Value |
|----------|-------|
| Chip | ESP32-D0WD-V3 (rev 3.1) |
| Features | Wi-Fi, BT Classic + BLE, Dual Core 240MHz |
| Flash | 4MB |
| Protocol | NDJSON over UART @ 115200 baud |

## Quick Start

### 1. Flash the firmware

```bash
# Install ESP-IDF v5.x first (see docs/hardware-setup.md)
cd firmware
idf.py set-target esp32
idf.py -p /dev/ttyUSB0 flash
```

### 2. Run the MCP server

```bash
# Install and run
uvx mcbluetooth-esp32

# Or with explicit port
ESP32_SERIAL_PORT=/dev/ttyUSB0 uvx mcbluetooth-esp32
```

### 3. Add to Claude Code

```bash
claude mcp add mcbluetooth-esp32 -- uvx mcbluetooth-esp32
```

### 4. Verify connection

```python
esp32_connect()      # → connected=true, ready=true
esp32_ping()         # → {pong: true}
esp32_get_info()     # → chip, fw_version, bt_mac
```

## MCP Tools

### Connection & System
| Tool | Description |
|------|-------------|
| `esp32_connect` | Open serial connection to ESP32 |
| `esp32_disconnect` | Close serial connection |
| `esp32_ping` | Verify UART link is alive |
| `esp32_status` | Get current BT/BLE state |
| `esp32_get_info` | Get chip model, firmware version, MAC |
| `esp32_reset` | Reboot the ESP32 |

### Configuration
| Tool | Description |
|------|-------------|
| `esp32_configure` | Set device name, IO capabilities, PIN |
| `esp32_set_ssp_mode` | Configure SSP pairing mode with optional auto-accept |
| `esp32_load_persona` | Load preset device profile (headset, speaker, etc.) |

### Classic Bluetooth
| Tool | Description |
|------|-------------|
| `esp32_classic_enable` | Enable BR/EDR radio |
| `esp32_classic_disable` | Disable BR/EDR radio |
| `esp32_classic_set_discoverable` | Make device visible for pairing |
| `esp32_classic_pair_respond` | Accept/reject incoming pairing |

### SPP (Serial Port Profile)
| Tool | Description |
|------|-------------|
| `esp32_spp_send` | Send data (text or hex) over SPP connection |
| `esp32_spp_disconnect` | Close the active SPP connection |
| `esp32_spp_status` | Get SPP connection status and remote address |

### HID (Human Interface Device)
| Tool | Description |
|------|-------------|
| `esp32_hid_enable` | Enable HID device (keyboard/mouse combo) |
| `esp32_hid_disable` | Disable HID device |
| `esp32_hid_connect` | Connect to a specific HID host |
| `esp32_hid_disconnect` | Disconnect from current host |
| `esp32_hid_send_keyboard` | Send keyboard report (keys + modifiers) |
| `esp32_hid_send_mouse` | Send mouse report (movement + buttons) |
| `esp32_hid_status` | Get HID connection status |

### BLE / GATT
| Tool | Description |
|------|-------------|
| `esp32_ble_enable` | Enable BLE radio |
| `esp32_ble_disable` | Disable BLE radio |
| `esp32_ble_advertise` | Start/stop BLE advertising |
| `esp32_ble_set_adv_data` | Configure advertisement data |
| `esp32_gatt_add_service` | Create GATT service |
| `esp32_gatt_add_characteristic` | Add characteristic to service |
| `esp32_gatt_set_value` | Set characteristic value |
| `esp32_gatt_notify` | Send notification to subscribers |
| `esp32_gatt_clear` | Remove all GATT services |

### Events
| Tool | Description |
|------|-------------|
| `esp32_get_events` | Retrieve event history |
| `esp32_wait_event` | Block until specific event occurs |
| `esp32_clear_events` | Clear event history |

## E2E Testing

Run automated tests using Claude CLI in headless mode:

```bash
# Setup test environment
mkdir -p /tmp/bt-e2e-test && cd /tmp/bt-e2e-test
git init

# Create MCP config with both servers
cat > .mcp.json << 'EOF'
{
  "mcpServers": {
    "esp32": {
      "type": "stdio",
      "command": "uvx",
      "args": ["mcbluetooth-esp32"],
      "env": {"ESP32_SERIAL_PORT": "/dev/ttyUSB0"}
    },
    "bluez": {
      "type": "stdio",
      "command": "uvx",
      "args": ["mcbluetooth"]
    }
  }
}
EOF

# Run test suite
PROMPT=$(cat tests/prompts/test-prompt-v5.md)
claude -p "$PROMPT" \
  --mcp-config .mcp.json \
  --allowedTools "mcp__esp32__*,mcp__bluez__*" \
  --output-format json
```

### Test Coverage (v5 - 76 tests)

| Phase | Tests | Coverage |
|-------|-------|----------|
| ESP32 Connection | 1-4 | connect, ping, info, status |
| BlueZ Adapter | 5-8 | list, info, pairable, discoverable |
| Classic BT + SSP | 9-24 | Full pairing workflow with auto-accept |
| BLE GATT Setup | 30-42 | Battery Service, Environmental Sensing |
| HCI Capture | 43-55 | btsnoop capture and analysis |
| GATT Operations | 56-63 | read, write, notify, subscribe |
| Cleanup | 64-76 | Adapter management, reset |

### Recent Test Results

| Version | Tests | Result | Duration |
|---------|-------|--------|----------|
| v4 | 71 | 66 PASS, 5 PARTIAL | 8.6 min |
| v5 | 76 | **76/76 PASS (100%)** | 7.6 min |

## Documentation

| Document | Description |
|----------|-------------|
| [hardware-setup.md](docs/hardware-setup.md) | ESP-IDF installation, flashing, wiring |
| [protocol-spec.md](docs/protocol-spec.md) | NDJSON UART protocol specification |
| [test-scenarios.md](docs/test-scenarios.md) | Manual E2E test procedures |
| [automated-e2e-testing.md](docs/automated-e2e-testing.md) | Claude CLI headless testing guide |

## Development

```bash
# Install dev dependencies
uv sync --all-extras

# Run unit tests
uv run pytest tests/ -v --ignore=tests/integration

# Run integration tests (requires ESP32)
ESP32_SERIAL_PORT=/dev/ttyUSB0 uv run pytest tests/integration/ -v

# Lint
uv run ruff check src/
```

## License

MIT