LwM2M Node.js Library

A comprehensive Lightweight Machine to Machine (LwM2M) implementation in Node.js featuring both client and server components with support for CoAP, DTLS encryption, and full bootstrap capabilities.

⚡ Quick Demo

Complete Bootstrap Workflow

Experience the full LwM2M lifecycle from device provisioning to operation:

1. Launch Bootstrap Server

node server/examples/bootstrapServer.js | npx pino-pretty

Handles device provisioning and security configuration on port 5684

2. Launch Main LwM2M Server

node server/examples/server.js | npx pino-pretty

Manages registered devices and resource operations on port 5683

3. Launch Bootstrap Client

node client/examples/bootstrapClient.js | npx pino-pretty

Simulates a device going through the complete bootstrap process

4. Launch Standard Client

node client/examples/client.js | npx pino-pretty

Simulates a pre-configured device connecting directly

🔄 What Happens

The bootstrap client automatically:

1. Connects to bootstrap server (port 5684)
2. Receives security and server configuration objects
3. Registers to main LwM2M server (port 5683)
4. Begins normal LwM2M operations (observations, resource access)

🔒 Secure Demo (DTLS)

For encrypted communication:

# Generate certificates
openssl ecparam -name secp256r1 -genkey -noout -out ecdsa.key
openssl req -x509 -new -key ecdsa.key -out ecdsa.crt -days 365 \
  -subj "/C=US/ST=Test/L=Test/O=Test/OU=Test/CN=localhost"

# Launch secure server
node server/examples/dtlsServer.js

🌟 Key Features

• 📱 Complete LwM2M Implementation: Full client and server with all standard objects
• 🔐 Security First: DTLS encryption and comprehensive bootstrap provisioning
• 🚀 Production Ready: Event-driven architecture with monitoring and analytics
• 🔧 Developer Friendly: Extensive examples, tests, and documentation
• 📊 Multiple Formats: Support for JSON, CBOR, TLV, and text data formats
• 🔄 Real-time: Resource observations and asynchronous notifications
• 📡 MQTT Integration: Bidirectional MQTT communication for device management

✅ LwM2M Node.js Capabilities Overview

| Feature | 🌐 Client | 🖥️ Server | ✅ Auto Tests | |--------------------------------------|-----------------------------------|-------------------------------------|-----------------| | Bootstrap Server | | | | | Bootstrap Request Handling | ✅ Supports bootstrap requests | ✅ Handles /bs endpoint | ✅ Covered | | Security Object Provisioning | ✅ Receives provisioned config | ✅ Creates security instances | ✅ Covered | | Server Object Provisioning | ✅ Receives provisioned config | ✅ Creates server instances | ✅ Covered | | Bootstrap Finish | ✅ Sends finish notification | ✅ Handles /bs-finish endpoint | ✅ Covered | | Configuration Management | 🕐 Planned | ✅ Per-endpoint configuration | 🟡 Partial | | | | | | | Server | | | | | LwM2M Registration (/rd) | ✅ Sends registration | ✅ Handles registration | ✅ Covered | | Registration Update (/rd/{id}) | ✅ Supports | ✅ Handles update | ✅ Covered | | Deregistration | ✅ Sends | ✅ Handles deregistration | ✅ Covered | | Error Detection / Retry | ✅ Logs failures | ✅ Detects connection loss | 🛑 Not Covered | | Event-Driven Responses | 🕐 Planned | ✅ Emits payload per request | 🟡 server | | | | | | | Object Model / Discovery | | | | | Built-in Objects (0–6 + 3303) | ✅ Fully implemented | 🕐 Used via client introspection | 🛑 Not Covered | | Well-Known Core Discovery | ✅ Responds with </x/y/z>;attr | ✅ Parses and lists resources | 🟡 server | | Resource Metadata (R/W/X/Obs/Units) | ✅ Defined per object | ✅ Discoverable via /core | 🛑 Not Covered | | Multiple Instances | 🕐 Planned | 🕐 Planned | 🛑 Not Covered | | | | | | | Resource Access | | | | | Resource Read | ✅ Responds with value | ✅ Sends GET request | ✅ Covered | | Resource Write | ✅ Accepts PUT | ✅ Sends PUT | ✅ Covered | | Resource Execute | ✅ Handles function call | ✅ Sends POST | ✅ Covered | | Resource Observation | ✅ Manages and sends notifications| ✅ Sends GET with Observe=0 | ✅ Covered | | Resource Write attribute | 🟡 Partially | 🛑 Not yet | 🛑 Not Covered | | Object,InstanceId Create | 🟡 Partially | 🛑 Not yet | 🛑 Not Covered | | Object,InstaceId Delete | 🟡 Partially | 🛑 Not yet | 🛑 Not Covered | | Manual Notification Push | ✅ Interval-based observe | ✅ Receives notifications | 🛑 Not Covered | | | | | | | Data Formats | | | | | Text Format (Content-Format: 0) | ✅ Default/fallback | ✅ Default/fallback | ✅ Covered | | Link Format (Content-Format: 40) | ✅ Encode/decode (⚠️ untested) | ✅ Encode/decode | ✅ Covered | | JSON Format (Content-Format: 50) | ✅ Encode/decode (⚠️ untested) | ✅ Encode/decode | ✅ Covered | | TLV LwM2M (Content-Format: 60) | ✅ Encode/decode (⚠️ untested) | ✅ Encode/decode | ✅ Covered | | JSON LwM2M (Content-Format: 61) | ✅ Encode/decode (⚠️ untested) | ✅ Encode/decode | ✅ Covered | | CBOR LwM2M (Content-Format: 62) | ✅ Encode/decode (⚠️ untested) | ✅ Encode/decode | ✅ Covered | | | | | | | Transport Layers | | | | | COAP | ✅ Default | ✅ Default | 🛑 Not Covered | | MQTT | ✅ Client support | ✅ Server support | ✅ Covered | | MQTT Request Handling | 🛑 Not applicable | ✅ Bidirectional communication | ✅ Covered | | Bridge COAP/MQTT | ✅ Implemented | ✅ Implemented | 🛑 Not Covered | | | | | | | Fota | | | | | UDP | 🕐 Planned | 🕐 Planned | 🛑 Not Covered | | HTTP | 🛑 Not yet | 🛑 Not yet | 🛑 Not Covered | | | | | | | Extra Features | | | | | Object 3303 Temperature (Simulated) | ✅ Periodic updates | ✅ Observes value | 🛑 Not Covered | | Security: DTLS, OSCORE | 🛑 OSCORE not yet | ✅ DTLS implemented | 🛑 Not Covered | | Persistant Storage | 🛑 Not yet | 🛑 Not yet | 🛑 Not Covered |

🔒 DTLS Security (Server-Side)

This library implements DTLS (Datagram Transport Layer Security) for secure CoAP communication on the server side. DTLS provides encryption, authentication, and message integrity for LwM2M communications.

Features

• ✅ Certificate-based Authentication: X.509 certificate support
• ✅ Encrypted Communication: All CoAP messages encrypted via DTLS
• ✅ Standard Port Support: Uses CoAPS port 5684
• ✅ Full LwM2M Protocol Support: Registration, updates, observations, and resource operations over DTLS

Quick Start

1. Generate SSL Certificates

# Generate ECDSA private key
openssl ecparam -name secp256r1 -genkey -noout -out ecdsa.key

# Generate self-signed certificate
openssl req -x509 -new -key ecdsa.key -out ecdsa.crt -days 365 \
  -subj "/C=US/ST=Test/L=Test/O=Test/OU=Test/CN=localhost"

2. Start DTLS Server

const { startLwM2MDTLSCoapServer } = require('./server/resourceClient');

// Validation function for client registration
const validation = (ep, payload) => {
  console.log(`Validating client: ${ep}`);
  return Promise.resolve(true);
};

// DTLS server options
const options = {
  port: 5684,              // Standard CoAPS (DTLS) port
  keyPath: './ecdsa.key',   // Path to private key
  certPath: './ecdsa.crt',  // Path to certificate
};

// Start the secure server
const server = startLwM2MDTLSCoapServer(validation, options);

3. Run Example DTLS Server

node server/examples/dtlsServer.js

Configuration Options

| Option | Type | Default | Description | |--------|------|---------|-------------| | port | number | 5684 | DTLS server port (standard CoAPS) | | keyPath | string | './server.key' | Path to RSA/ECDSA private key | | certPath | string | './server.crt' | Path to X.509 certificate |

Supported Operations

All standard LwM2M operations are supported over DTLS:

• Registration: /rd endpoint with encrypted client information
• Registration Update: /rd/{location} with secure updates
• Deregistration: Secure client disconnection
• Resource Operations: GET, PUT, POST operations on resources
• Observations: Encrypted notification delivery
• Bootstrap: Secure provisioning of client configurations

Security Considerations

• Certificate Management: Use proper CA-signed certificates in production
• Key Protection: Secure private key storage and access control
• Client Authentication: Implement proper client certificate validation
• Regular Updates: Keep certificates current and rotate keys periodically

Events

DTLS server emits the same events as the standard CoAP server:

const sharedEmitter = require('./server/transport/sharedEmitter');

sharedEmitter.on('registration', ({ protocol, ep, location }) => {
  console.log(`[${protocol}] Client ${ep} registered at ${location}`);
});

sharedEmitter.on('update', ({ protocol, ep, location }) => {
  console.log(`[${protocol}] Client ${ep} updated registration`);
});

sharedEmitter.on('deregistration', ({ protocol, ep }) => {
  console.log(`[${protocol}] Client ${ep} deregistered`);
});

🚀 Bootstrap Server Details

The Bootstrap Server is a critical component that provides initial configuration and security provisioning for LwM2M devices. It follows the OMA LwM2M specification for bootstrap procedures.

Core Bootstrap Workflow

1. [Client] ──── POST /bs?ep=device-id ────► [Bootstrap Server]
2. [Client] ◄─── Delete Security Objects ─── [Bootstrap Server]  
3. [Client] ◄─── Delete Server Objects ───── [Bootstrap Server]
4. [Client] ◄─── Write Security Instance ─── [Bootstrap Server]
5. [Client] ◄─── Write Server Instance ───── [Bootstrap Server]
6. [Client] ──── POST /bs-finish ──────────► [Bootstrap Server]
7. [Client] ──── Register to LwM2M Server ─► [Main LwM2M Server]

Bootstrap Objects

Security Object (ID: 0)

Provisioned with server connection details:

{
  instanceId: 0,
  serverUri: 'coap://localhost:5683',  // Main LwM2M server URI
  isBootstrap: false,                  // This is for main server
  securityMode: 3,                     // 0=PSK, 1=RPK, 2=Cert, 3=NoSec
  shortServerId: 123,                  // Server ID reference
  publicKey: 'client-identity',        // PSK identity or certificate
  secretKey: 'shared-secret'           // PSK key or private key
}

Server Object (ID: 1)

Operational parameters for the main server:

{
  instanceId: 0,
  shortServerId: 123,                  // Must match Security Object
  lifetime: 300,                       // Registration lifetime (seconds)
  binding: 'U',                        // UDP binding
  notificationStoring: true            // Store notifications when offline
}

Bootstrap Configuration

Per-Device Configuration

const { setBootstrapConfiguration } = require('./server/handleBootstrap');

// Configure specific device
setBootstrapConfiguration('device-001', {
  securityInstances: [{
    instanceId: 0,
    serverUri: 'coaps://production-server.com:5684',
    isBootstrap: false,
    securityMode: 2,  // Certificate-based security
    shortServerId: 999,
    publicKey: 'device-001-cert.pem',
    secretKey: 'device-001-key.pem'
  }],
  serverInstances: [{
    instanceId: 0,
    shortServerId: 999,
    lifetime: 3600,    // 1 hour lifetime
    binding: 'U',
    notificationStoring: true
  }]
});

Bulk Configuration

// Configure multiple devices with similar settings
const devices = ['device-001', 'device-002', 'device-003'];
devices.forEach(deviceId => {
  setBootstrapConfiguration(deviceId, {
    securityInstances: [{
      instanceId: 0,
      serverUri: 'coap://fleet-server.example.com:5683',
      isBootstrap: false,
      securityMode: 1,  // PSK mode
      shortServerId: 100,
      publicKey: deviceId,
      secretKey: generatePSK(deviceId)  // Your PSK generation logic
    }],
    serverInstances: [{
      instanceId: 0,
      shortServerId: 100,
      lifetime: 86400,  // 24 hours
      binding: 'U',
      notificationStoring: true
    }]
  });
});

Bootstrap Server Events

Monitor bootstrap process with detailed events:

const sharedEmitter = require('./server/transport/sharedEmitter');

// Client requested bootstrap
sharedEmitter.on('bootstrap-request', ({ protocol, ep }) => {
  console.log(`Bootstrap requested by ${ep} via ${protocol}`);
  // Log for security monitoring
  // Update device status in database
});

// Client completed bootstrap
sharedEmitter.on('bootstrap-finish', ({ protocol, ep }) => {
  console.log(`Bootstrap completed for ${ep}`);
  // Mark device as ready for operations
  // Trigger any post-bootstrap actions
});

Security Modes

| Mode | Value | Description | Use Case | |------|--------|-------------|----------| | PSK | 0 | Pre-Shared Key | Simple deployments, shared secrets | | RPK | 1 | Raw Public Key | Certificate-less PKI | | Certificate | 2 | X.509 Certificates | Full PKI infrastructure | | NoSec | 3 | No Security | Development, testing only |

Production Deployment

Security Best Practices

// Production bootstrap configuration
const productionConfig = {
  securityInstances: [{
    instanceId: 0,
    serverUri: 'coaps://lwm2m.yourcompany.com:5684',
    isBootstrap: false,
    securityMode: 2,  // Use certificates in production
    shortServerId: 1,
    publicKey: './certs/device-cert.pem',
    secretKey: './certs/device-key.pem'
  }],
  serverInstances: [{
    instanceId: 0,
    shortServerId: 1,
    lifetime: 3600,      // Reasonable lifetime
    binding: 'U',
    notificationStoring: true
  }]
};

Monitoring and Logging

// Enhanced bootstrap logging
sharedEmitter.on('bootstrap-request', ({ protocol, ep, timestamp }) => {
  // Security logging
  auditLog.info('Bootstrap attempt', {
    endpoint: ep,
    protocol: protocol,
    timestamp: timestamp,
    sourceIp: req.connection.remoteAddress
  });
  
  // Rate limiting check
  if (isRateLimited(ep)) {
    throw new Error('Too many bootstrap attempts');
  }
});

Usage

Usage

Standard LwM2M Server

Start a basic CoAP server for device registration and management:

const { startLwM2MCoapServer } = require('./server/resourceClient');

// Validation function for client registration
const validation = (ep, payload) => {
  console.log(`Registering device: ${ep}`);
  // Add custom validation logic here
  return Promise.resolve(true);
};

// Start server on default port 5683
const server = startLwM2MCoapServer(validation);

Or run the example server:

node server/server.js | npx pino-pretty

Bootstrap-Enabled Deployment

For production deployments with device provisioning:

# Terminal 1: Start Bootstrap Server
node server/bootstrapServer.js | npx pino-pretty

# Terminal 2: Start Main LwM2M Server  
node server/server.js | npx pino-pretty

# Terminal 3: Start Bootstrap Client
node client/bootstrapClient.js | npx pino-pretty

Secure DTLS Deployment

For encrypted communication:

# Generate certificates first
openssl ecparam -name secp256r1 -genkey -noout -out ecdsa.key
openssl req -x509 -new -key ecdsa.key -out ecdsa.crt -days 365 \
  -subj "/C=US/ST=Test/L=Test/O=Test/OU=Test/CN=localhost"

# Start DTLS server
node server/examples/dtlsServer.js

Client Operations

Resource Discovery

# Discover available resources
coap-cli get coap://localhost:5683/.well-known/core

Resource Operations

const { sendCoapRequest } = require('./server/transport/coapClient');

// Read device manufacturer (Object 3, Instance 0, Resource 0)
const response = await sendCoapRequest('localhost', 5683, 'GET', '/3/0/0');
console.log('Manufacturer:', response.payload.toString());

// Write firmware update URL (Object 5, Instance 0, Resource 1)
await sendCoapRequest('localhost', 5683, 'PUT', '/5/0/1', {
  payload: Buffer.from('https://example.com/firmware.bin')
});

// Execute firmware update (Object 5, Instance 0, Resource 2)
await sendCoapRequest('localhost', 5683, 'POST', '/5/0/2');

Observations

// Start observing a resource
await sendCoapRequest('localhost', 5683, 'GET', '/3303/0/5700', {
  observe: true,
  confirmable: true
});

// Listen for notifications
const sharedEmitter = require('./server/transport/sharedEmitter');
sharedEmitter.on('notification', ({ ep, path, payload }) => {
  console.log(`${ep} ${path}: ${payload.toString()}`);
});

Event Monitoring

Monitor all LwM2M server events:

const sharedEmitter = require('./server/transport/sharedEmitter');

// Device lifecycle events
sharedEmitter.on('registration', ({ protocol, ep, location }) => {
  console.log(`[${protocol}] Device ${ep} registered at ${location}`);
});

sharedEmitter.on('update', ({ protocol, ep, location }) => {
  console.log(`[${protocol}] Device ${ep} updated registration`);
});

sharedEmitter.on('deregistration', ({ protocol, ep }) => {
  console.log(`[${protocol}] Device ${ep} disconnected`);
});

// Resource events
sharedEmitter.on('notification', ({ protocol, ep, path, payload }) => {
  console.log(`[${protocol}] ${ep} notification ${path}: ${payload.toString()}`);
});

// Bootstrap events
sharedEmitter.on('bootstrap-request', ({ protocol, ep }) => {
  console.log(`[${protocol}] Bootstrap requested by ${ep}`);
});

sharedEmitter.on('bootstrap-finish', ({ protocol, ep }) => {
  console.log(`[${protocol}] Bootstrap completed for ${ep}`);
});

Resource Server (Client-Side)

For device simulation and testing:

const { startResourceServer } = require('./client/resourceServer');

// Start client resource server with temperature sensor simulation
const server = startResourceServer(56831);

// Server automatically provides:
// - Device object (ID 3) with manufacturer, model, etc.
// - Connectivity monitoring (ID 4) 
// - Temperature sensor (ID 3303) with simulated values

• Start the client to simulate a device with observable resources.
• Run the server to manage registrations, handle resource operations, and observe notifications.
• Explore .well-known/core for resource discovery.
• Utilize CBOR or TLV encoding/decoding for efficient payload exchange.

🏗️ Server Architecture

The LwM2M server implementation provides a comprehensive device management platform with the following components:

Core Server Components

1. Resource Client (server/resourceClient.js)

• CoAP Server: Standard LwM2M server on port 5683
• DTLS Server: Secure LwM2M server on port 5684
• Protocol Support: CoAP and DTLS transport layers
• Event Emission: Real-time server events via shared emitter

2. Client Registry (server/clientRegistry.js)

• Device Registration: Tracks connected devices and their metadata
• Location Management: Maps registration locations to device endpoints
• Connection State: Monitors device connectivity and lifecycle

3. Observation Registry (server/observationRegistry.js)

• Resource Observations: Manages active resource observations
• Token Management: Tracks observation tokens and associated resources
• Notification Routing: Routes notifications to correct observers

4. Bootstrap Server (server/bootstrap.js)

• Device Provisioning: Provides initial configuration to devices
• Security Management: Provisions security objects and credentials
• Configuration Storage: Per-device bootstrap configurations

Server-Side Features

| Component | Feature | Description | |-----------|---------|-------------| | Client Management | Registration Handling | Processes device registration requests | | | Lifecycle Tracking | Monitors device connect/disconnect events | | | Metadata Storage | Stores device information and capabilities | | Security | DTLS Support | Encrypted communication with certificate validation | | | Bootstrap Security | Secure device provisioning and credential management | | | Authentication | Configurable client validation functions | | Resource Operations | Read Operations | Handle GET requests for device resources | | | Write Operations | Handle PUT requests to update device state | | | Execute Operations | Handle POST requests for device actions | | | Discovery | Support for .well-known/core resource discovery | | Observations | Resource Monitoring | Real-time monitoring of device resources | | | Notification Delivery | Asynchronous notification handling | | | Token Management | Secure observation token tracking | | Data Formats | Content Negotiation | Support for multiple data formats | | | Format Conversion | Automatic encoding/decoding based on Accept headers | | | Binary Support | Efficient binary data handling |

Event-Driven Architecture

The server uses an event-driven architecture for real-time device management:

const sharedEmitter = require('./server/transport/sharedEmitter');

// Available server events:
// - 'registration': Device registered
// - 'update': Registration updated  
// - 'deregistration': Device disconnected
// - 'notification': Resource notification received
// - 'bootstrap-request': Bootstrap requested
// - 'bootstrap-finish': Bootstrap completed

Configuration and Deployment

Production Server Setup

const { startLwM2MCoapServer } = require('./server/resourceClient');

// Custom validation for production
const productionValidation = async (ep, payload) => {
  // Implement authentication logic
  const isAuthorized = await checkDeviceAuthorization(ep);
  if (!isAuthorized) {
    throw new Error(`Unauthorized device: ${ep}`);
  }
  
  // Validate device capabilities
  const capabilities = parseRegistrationPayload(payload);
  if (!isValidCapabilities(capabilities)) {
    throw new Error(`Invalid capabilities for device: ${ep}`);
  }
  
  return true;
};

// Start production server
const server = startLwM2MCoapServer(productionValidation, 5683);

Monitoring and Analytics

// Real-time device monitoring
const deviceMetrics = new Map();

sharedEmitter.on('registration', ({ ep, location }) => {
  deviceMetrics.set(ep, {
    registeredAt: Date.now(),
    lastSeen: Date.now(),
    location: location,
    notificationCount: 0
  });
});

sharedEmitter.on('notification', ({ ep, path, payload }) => {
  const metrics = deviceMetrics.get(ep);
  if (metrics) {
    metrics.lastSeen = Date.now();
    metrics.notificationCount++;
    deviceMetrics.set(ep, metrics);
  }
});

// Health check endpoint
setInterval(() => {
  const activeDevices = deviceMetrics.size;
  const totalNotifications = Array.from(deviceMetrics.values())
    .reduce((sum, device) => sum + device.notificationCount, 0);
  
  console.log(`Active devices: ${activeDevices}, Total notifications: ${totalNotifications}`);
}, 30000);

📡 MQTT Integration

The LwM2M server provides comprehensive MQTT integration for bidirectional communication with IoT devices and external systems.

Features

• 🔄 Bidirectional Communication: Send requests to devices via MQTT and receive responses
• 📊 Real-time Data Streaming: Device sensor data published to MQTT topics
• 🎯 Device Lifecycle Events: Registration, updates, and deregistration events via MQTT
• 🛠️ Complete LwM2M Operations: Support for GET, PUT, POST, DELETE, DISCOVER, and OBSERVE operations
• 🔧 Flexible Topic Structure: Organized topic hierarchy for easy subscription management

Quick Start

1. Start Enhanced MQTT Gateway

const MqttRequestHandler = require('./server/mqttRequestHandler');

// Start bidirectional MQTT gateway
node server/examples/serverMqttBidirectional.js

2. Send Requests via MQTT

# Read device manufacturer
mosquitto_pub -h localhost -t "lwm2m/requests/device001/GET/3/0/0" -m "{}"

# Write temperature threshold  
mosquitto_pub -h localhost -t "lwm2m/requests/device001/PUT/3303/0/5601" -m '{"payload": "-10.0"}'

# Start observing temperature
mosquitto_pub -h localhost -t "lwm2m/requests/device001/OBSERVE/3303/0/5700" -m "{}"

3. Subscribe to Responses and Data

# Listen to device responses
mosquitto_sub -h localhost -t "lwm2m/responses/+/+/+"

# Listen to sensor data
mosquitto_sub -h localhost -t "lwm2m/+/sensor/+"

# Listen to device events
mosquitto_sub -h localhost -t "lwm2m/+/registered"

MQTT Topic Structure

| Purpose | Topic Pattern | Example | |---------|---------------|---------| | Inbound Requests | {project}/requests/{endpoint}/{method}{path} | lwm2m/requests/device001/GET/3/0/0 | | Outbound Responses | {project}/responses/{endpoint}/{method}{path} | lwm2m/responses/device001/GET/3/0/0 | | Device Data | {project}/{endpoint}/sensor{path} | lwm2m/device001/sensor/3303/0/5700 | | Lifecycle Events | {project}/{endpoint}/{event} | lwm2m/device001/registered |

Supported Operations

| Method | Description | Payload Required | Example | |--------|-------------|------------------|---------| | GET | Read resource value | No | Read device manufacturer | | PUT | Write resource value | Yes | Update configuration | | POST | Execute resource | Optional | Trigger device reboot | | DELETE | Delete object instance | No | Remove configuration | | DISCOVER | Discover available resources | No | List all resources | | OBSERVE | Start observing resource | No | Monitor temperature | | CANCEL-OBSERVE | Stop observing resource | No | Stop monitoring |

Programming Examples

Using the MQTT Request Handler

const MqttRequestHandler = require('./server/mqttRequestHandler');

const handler = new MqttRequestHandler({
  project: 'lwm2m',
  host: 'localhost', 
  port: 1883,
  username: 'user',
  password: 'pass'
});

await handler.connect();

Integration with Existing Gateway

// server/examples/serverMqttBidirectional.js includes:
// - Existing outbound data publishing
// - New inbound request handling  
// - Unified configuration
// - Event correlation

Demo Client

# Run interactive demo
node server/examples/mqttDemo.js

For detailed documentation, see MQTT Request Handler Documentation.

TODO

Planned Enhancements

• OSCORE Security: Implement Object Security for CoAP (RFC 8613)
• Client-Side DTLS: Add DTLS support for LwM2M clients
• Persistent Storage: Database backend for device state and configurations
• Error Recovery: Enhanced error handling and automatic retry mechanisms
• Performance Optimization: Connection pooling and resource caching
• Advanced Analytics: Device behavior analytics and reporting dashboards
• Bulk Operations: Firmware update campaigns and mass device configuration
• Protocol Extensions: SMS binding and other transport alternatives

Testing Improvements

• Integration Tests: End-to-end bootstrap and registration workflows
• Performance Tests: Load testing with multiple concurrent devices
• Security Tests: Penetration testing and vulnerability assessments
• Compatibility Tests: Interoperability with other LwM2M implementations

Contributing

Feel free to open issues or submit pull requests to improve this library!

Made with ❤️ for LwM2M enthusiasts.