dlms 1.0.0

A pure Dart library for the DLMS/COSEM smart metering protocol. Supports TCP/HDLC transport, Secure Authentication (HLS), and object-oriented interface classes.

example/dlms_example.dart

import 'dart:typed_data';
import 'package:dlms/dlms.dart';

// A mock transport to simulate a meter connection for this example.
// In a real app, use TcpTransport or HdlcTransport.
class MockTransport extends DlmsTransport {
  @override
  Stream<Uint8List> get stream => const Stream.empty();

  @override
  Future<void> connect() async => print('Connected to Mock Meter.');

  @override
  Future<void> disconnect() async => print('Disconnected.');

  @override
  Future<void> send(Uint8List data) async {}

  @override
  Future<Uint8List> sendRequest(Uint8List request, {Duration timeout = const Duration(seconds: 5)}) async {
    // 1. Association Response (AARE)
    if (request[0] == 0x60) {
      return Uint8List.fromList([
        0x61, 0x1F, 0xA1, 0x09, 0x06, 0x07, 0x60, 0x85, 0x74, 0x05, 0x08, 0x01, 0x01,
        0xA2, 0x03, 0x02, 0x01, 0x00, 
        0xBE, 0x0D, 0x04, 0x0B, 0x08, 0x00, 0x06, 0x5F, 0x1F, 0x04, 0x00, 0x00, 0x1E, 0x1D, 0x04, 0x00
      ]);
    }
    // 2. GetResponse for Active Energy (1.0.1.8.0.255)
    if (request[0] == 0xC0) {
      // Return 123456 Wh (Unsigned32)
      return Uint8List.fromList([0xC4, 0x01, 0x81, 0x00, 0x06, 0x00, 0x01, 0xE2, 0x40]);
    }
    return Uint8List(0);
  }
}

void main() async {
  // 1. Initialize Client
  final transport = MockTransport(); 
  // For real usage: final transport = TcpTransport('192.168.1.10', 4059);
  
  final client = DlmsClient(transport);

  try {
    // 2. Connect
    await client.connect();

    // 3. Read Active Energy Import (+A)
    final energyObis = ObisCode(1, 0, 1, 8, 0, 255);
    final register = CosemRegister(client, energyObis);
    
    print('Reading Active Energy...');
    final value = await register.value;
    
    print('Current Energy: $value');

  } catch (e) {
    print('Error: $e');
  } finally {
    await client.disconnect();
  }
}