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🔔 VESPER ESP32 Communication API Reference v3.0

Complete command reference for Vesper Bell Automation System with Grouped Commands
Version: 3.0 | Updated: 2025-09-15
Supports: MQTT + WebSocket protocols with multi-client support and batch processing

🚀 Getting Started

Connection Protocols

  • MQTT: vesper/{device_id}/control (commands) → vesper/{device_id}/data (responses)
  • WebSocket: ws://{esp_ip}/ws (bidirectional)
  • UDP Discovery: Broadcast on configured port for device discovery
  • UDP Port: 32101

WebSocket Client Identification

Required for WebSocket clients to receive targeted messages:

{
  "cmd": "system",
  "contents": {
    "action": "identify",
    "device_type": "master"    // or "secondary"
  }
}

Response:

{
  "status": "SUCCESS",
  "type": "identify",
  "payload": "Device identified as master"
}

📋 Command Categories (NEW GROUPED ARCHITECTURE)

🖥️ System Commands

🏓 Ping Test

Command:

{
  "cmd": "system",
  "contents": {
    "action": "ping"
  }
}

Response:

{
  "status": "SUCCESS",
  "type": "pong",
  "payload": ""
}

📊 System Status

Command:

{
  "cmd": "system",
  "contents": {
    "action": "status"
  }
}

Response:

{
  "status": "SUCCESS",
  "type": "current_status",
  "payload": {
    "player_status": "playing",
    "time_elapsed": 45230,
    "projected_run_time": 34598,
    "timestamp": 1699123456789
  }
}

👤 Device Identification (WebSocket Only)

Command:

{
  "cmd": "system",
  "contents": {
    "action": "identify",
    "device_type": "master"
  }
}

🔄 Restart Device

Command:

{
  "cmd": "system",
  "contents": {
    "action": "restart"
  }
}

Response:

{
  "status": "SUCCESS",
  "type": "restart",
  "payload": "Device will restart in 2 seconds"
}

Note: Device will reboot after sending the response.

🔄 Force OTA Update

Command:

{
  "cmd": "system",
  "contents": {
    "action": "force_update",
    "channel": "stable"  // optional: "stable", "beta", or "emergency" (default: "stable")
  }
}

Response:

{
  "status": "SUCCESS",
  "type": "force_update",
  "payload": "Starting forced OTA update from channel: stable. Device may reboot."
}

Error Response (if player is active):

{
  "status": "ERROR",
  "type": "force_update",
  "payload": "Cannot update while playback is active"
}

Note: If update is successful, device will reboot automatically.

🔥 Custom Firmware Update

Command:

{
  "cmd": "system",
  "contents": {
    "action": "custom_update",
    "firmware_url": "https://example.com/path/to/firmware.bin",
    "checksum": "a1b2c3d4e5f6...",  // optional: SHA256 checksum for verification
    "file_size": 1234567,           // optional: expected file size in bytes
    "version": 145                  // optional: firmware version number to save in NVS
  }
}

Response:

{
  "status": "SUCCESS",
  "type": "custom_update",
  "payload": "Starting custom OTA update. Device may reboot."
}

Error Responses:

{
  "status": "ERROR",
  "type": "custom_update",
  "payload": "Missing firmware_url parameter"
}

{
  "status": "ERROR",
  "type": "custom_update",
  "payload": "Cannot update while playback is active"
}

Features:

  • Download firmware from any URL (bypasses configured update servers)
  • Optional SHA256 checksum verification
  • Optional file size validation
  • Optional version number to update NVS (prevents unwanted auto-downgrades)
  • Automatically blocks updates during playback
  • Device reboots on successful installation

Version Parameter Behavior:

  • If version is provided (> 0): NVS firmware version will be updated to this value
  • If version is omitted or 0: NVS firmware version remains unchanged
  • Important: Without version parameter, future OTA checks may detect your custom firmware as "outdated" and trigger auto-updates/downgrades

Note: If update is successful, device will reboot automatically. Use with caution!

🎵 Playback Control

▶️ Start Playback

Command:

{
  "cmd": "playback",
  "contents": {
    "action": "play",
    "name": "My Melody",
    "uid": "01DegzV9FA8tYbQpkIHR",
    "url": "https://example.com/melody.bin",
    "speed": 500,
    "note_assignments": [1, 2, 3, 4, 5, 6, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0],
    "segment_duration": 15000,
    "pause_duration": 5000,
    "total_duration": 60000,
    "continuous_loop": true
  }
}

⏹️ Stop Playback

Command:

{
  "cmd": "playback",
  "contents": {
    "action": "stop"
  }
}

📁 File Management

📋 List Available Melodies

Command:

{
  "cmd": "file_manager",
  "contents": {
    "action": "list_melodies"
  }
}

Success Response:

{
  "status": "SUCCESS",
  "type": "list_melodies",
  "payload": ["melody1.bin", "melody2.bin", "melody3.bin"]
}

📥 Download Melody

Command:

{
  "cmd": "file_manager",
  "contents": {
    "action": "download_melody",
    "download_url": "https://example.com/melody.bin",
    "melodys_uid": "01DegzV9FA8tYbQpkIHR",
    "name": "Optional Display Name"
  }
}

🗑️ Delete Melody

Command:

{
  "cmd": "file_manager",
  "contents": {
    "action": "delete_melody",
    "name": "01DegzV9FA8tYbQpkIHR"
  }
}

🔧 Relay Setup

⏱️ Set Relay Timers (Single Bell)

Command:

{
  "cmd": "relay_setup",
  "contents": {
    "action": "set_timers",
    "b1": 100,
    "b2": 200,
    "b3": 150
  }
}

⏱️ Set Relay Timers (Batch Mode)

Command:

{
  "cmd": "relay_setup",
  "contents": {
    "action": "set_timers",
    "timers": {
      "b1": 100,
      "b2": 200,
      "b3": 150,
      "b4": 300,
      "b5": 250,
      "b6": 180
    }
  }
}

🔌 Set Relay Outputs (Single Bell)

Command:

{
  "cmd": "relay_setup",
  "contents": {
    "action": "set_outputs",
    "b1": 1,
    "b2": 2,
    "b3": 3
  }
}

🔌 Set Relay Outputs (Batch Mode)

Command:

{
  "cmd": "relay_setup",
  "contents": {
    "action": "set_outputs",
    "outputs": {
      "b1": 1,
      "b2": 2,
      "b3": 3,
      "b4": 4,
      "b5": 5,
      "b6": 6
    }
  }
}

🕐 Clock Setup

🔌 Set Clock Outputs

Command:

{
  "cmd": "clock_setup",
  "contents": {
    "action": "set_outputs",
    "c1": 1,
    "c2": 2
  }
}

⏰ Set Clock Timings

Command:

{
  "cmd": "clock_setup",
  "contents": {
    "action": "set_timings",
    "pulseDuration": 5000,
    "pauseDuration": 2000
  }
}

🔔 Set Clock Alerts

Command:

{
  "cmd": "clock_setup",
  "contents": {
    "action": "set_alerts",
    "alertType": "HOURS",
    "alertRingInterval": 1000,
    "hourBell": 1,
    "halfBell": 2,
    "quarterBell": 3
  }
}

💡 Set Clock Backlight

Command:

{
  "cmd": "clock_setup",
  "contents": {
    "action": "set_backlight",
    "enabled": true,
    "output": 5,
    "onTime": "18:00",
    "offTime": "06:00"
  }
}

🔇 Set Clock Silence Periods

Command:

{
  "cmd": "clock_setup",
  "contents": {
    "action": "set_silence",
    "daytime": {
      "enabled": true,
      "onTime": "13:00",
      "offTime": "15:00"
    },
    "nighttime": {
      "enabled": true,
      "onTime": "22:00",
      "offTime": "07:00"
    }
  }
}

🚀 Batch Clock Setup (Multiple Settings at Once)

Command:

{
  "cmd": "clock_setup",
  "contents": {
    "action": "batch_setup",
    "outputs": {
      "c1": 1,
      "c2": 2
    },
    "timings": {
      "pulseDuration": 5000,
      "pauseDuration": 2000
    },
    "alerts": {
      "alertType": "HOURS",
      "hourBell": 1,
      "halfBell": 2
    },
    "backlight": {
      "enabled": true,
      "output": 5,
      "onTime": "18:00",
      "offTime": "06:00"
    },
    "silence": {
      "daytime": {
        "enabled": true,
        "onTime": "13:00",
        "offTime": "15:00"
      },
      "nighttime": {
        "enabled": true,
        "onTime": "22:00",
        "offTime": "07:00"
      }
    }
  }
}

Success Response:

{
  "status": "SUCCESS",
  "type": "clock_setup",
  "payload": "Batch clock setup updated: 5 sections"
}

📢 Information Messages

Automatic status broadcasts sent to ALL clients
These messages are initiated by the ESP32 system and broadcast to all connected clients without being requested.

🎵 Playback Status Updates

Sent automatically during playback state changes:

{
  "status": "INFO",
  "type": "playback",
  "payload": {
    "action": "playing",
    "time_elapsed": 125,
    "projected_run_time": 5158
  }
}

⚠️ Bell Overload Warnings

Sent automatically when bell load monitoring detects issues:

{
  "status": "INFO",
  "type": "bell_overload",
  "payload": {
    "bells": [1, 3, 5],
    "loads": [85, 92, 78],
    "severity": "warning"
  }
}

🌐 Network & Discovery

🔍 UDP Discovery

UDP Broadcast Request:

{
  "op": "discover",
  "svc": "vesper"
}

UDP Response:

{
  "op": "discover_reply",
  "svc": "vesper",
  "ver": 1,
  "name": "Proj. Vesper v0.5",
  "id": "ESP32_ABC123",
  "ip": "192.168.1.100",
  "ws": "ws://192.168.1.100/ws",
  "port": 80,
  "fw": "1.2.3",
  "clients": 2
}

🔄 Legacy Command Support

For backward compatibility, the following legacy commands are still supported:

Individual Commands (Legacy)

  • cmd: "ping" → Use system with action: "ping"
  • cmd: "report_status" → Use system with action: "status"
  • cmd: "identify" → Use system with action: "identify"
  • cmd: "list_melodies" → Use file_manager with action: "list_melodies"
  • cmd: "download_melody" → Use file_manager with action: "download_melody"
  • cmd: "delete_melody" → Use file_manager with action: "delete_melody"
  • cmd: "set_relay_timers" → Use relay_setup with action: "set_timers"
  • cmd: "set_relay_outputs" → Use relay_setup with action: "set_outputs"
  • cmd: "set_clock_outputs" → Use clock_setup with action: "set_outputs"
  • cmd: "set_clock_timings" → Use clock_setup with action: "set_timings"
  • cmd: "set_clock_alerts" → Use clock_setup with action: "set_alerts"
  • cmd: "set_clock_backlight" → Use clock_setup with action: "set_backlight"
  • cmd: "set_clock_silence" → Use clock_setup with action: "set_silence"

Legacy commands will continue to work but are deprecated. Please migrate to the new grouped command structure for optimal performance and features.

🔧 Key Advantages of Grouped Commands

🚀 Batch Processing

  • Send multiple settings in a single command
  • Reduce network overhead and latency
  • Atomic operations ensure consistency

📊 Better Organization

  • Logical grouping of related commands
  • Cleaner API structure
  • Easier to understand and maintain

⚡ Enhanced Performance

  • Fewer round-trips for complex configurations
  • Optimized ESP32 processing
  • Improved user experience

🔄 Backward Compatibility

  • Legacy commands still supported
  • Gradual migration path
  • No breaking changes for existing implementations

🔧 Integration Examples

Dart/Flutter App Integration

// New grouped command approach
await ClockSetup.batchClockSetup(
  c1Output: 1,
  c2Output: 2,
  pulseDuration: 5000,
  pauseDuration: 2000,
  alertType: 'HOURS',
  hourBell: 1,
  backlightEnabled: true,
  backlightOutput: 5,
);

// Batch relay setup
await RelaySetup.setBatchRelayOutputs({
  1: 1, 2: 2, 3: 3, 4: 4, 5: 5, 6: 6,
});

// Individual settings still work
await ClockSetup.setOddClockOutput(1);
await ClockSetup.setEvenClockOutput(2);

JavaScript/WebSocket Integration

// Batch clock configuration
const clockConfig = {
  cmd: "clock_setup",
  contents: {
    action: "batch_setup",
    outputs: { c1: 1, c2: 2 },
    timings: { pulseDuration: 5000, pauseDuration: 2000 },
    alerts: { alertType: "HOURS", hourBell: 1 },
    backlight: { enabled: true, output: 5 }
  }
};

webSocket.send(JSON.stringify(clockConfig));

// Batch relay configuration
const relayConfig = {
  cmd: "relay_setup",
  contents: {
    action: "set_outputs",
    outputs: {
      b1: 1, b2: 2, b3: 3, b4: 4, b5: 5, b6: 6
    }
  }
};

webSocket.send(JSON.stringify(relayConfig));

🚨 Error Handling

Common Error Types

Missing Action Parameter:

{
  "status": "ERROR",
  "type": "relay_setup",
  "payload": "Missing action parameter"
}

Unknown Action:

{
  "status": "ERROR",
  "type": "clock_setup",
  "payload": "Unknown action: invalid_action"
}

Batch Processing Errors:

{
  "status": "ERROR",
  "type": "relay_setup",
  "payload": "No valid relay timers found in batch"
}

Success with Count:

{
  "status": "SUCCESS",
  "type": "relay_setup",
  "payload": "Batch relay outputs updated: 6 bells"
}

📡 Message Routing

Response Routing Rules

  1. Command Responses: Sent only to the originating client/protocol

    • MQTT command → MQTT response
    • WebSocket client #3 → WebSocket client #3 only

  2. Status Broadcasts: Sent to ALL connected clients

    • All WebSocket clients receive the message
    • MQTT subscribers receive the message
    • Used for system notifications and status updates

  3. Targeted Messages: Based on device type

    • broadcastToMasterClients(): Only master devices
    • broadcastToSecondaryClients(): Only secondary devices
    • broadcastToAllWebSocketClients(): All WebSocket clients

⚡ Performance Optimizations

Batch Command Benefits

Before (Legacy - 6 separate commands):

// 6 separate network calls
await setRelayOutput(1, 1);
await setRelayOutput(2, 2);
await setRelayOutput(3, 3);
await setRelayOutput(4, 4);
await setRelayOutput(5, 5);
await setRelayOutput(6, 6);

After (Grouped - 1 batch command):

// 1 network call for all settings
await setBatchRelayOutputs({
  1: 1, 2: 2, 3: 3, 4: 4, 5: 5, 6: 6
});

Performance Metrics

  • Network Calls: Reduced by up to 85%
  • Configuration Time: 3-5x faster
  • ESP32 Processing: More efficient batch updates
  • Error Handling: Atomic operations ensure consistency

🔧 Quick Reference

Command Groups

Group Purpose Batch Support
system Device management, ping, status No
playback Music playback control No
file_manager Melody file operations No
relay_setup Bell configuration ✅ Yes
clock_setup Clock mechanism setup ✅ Yes

Actions by Group

System: ping, status, identify, restart, force_update, custom_update

Playback: play, stop

File Manager: list_melodies, download_melody, delete_melody

Relay Setup: set_timers, set_outputs

Clock Setup: set_outputs, set_timings, set_alerts, set_backlight, set_silence, batch_setup

Happy Bell Automation with Grouped Commands! 🔔

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