dart_modbus 1.0.1

A pure Dart modbus library supporting RTU, ASCII, and TCP client/server implementations

Changelog

All notable changes to this project will be documented in this file.

The format is based on Keep a Changelog, and this project adheres to Semantic Versioning.

Unreleased

0.1.0 - 2025-10-24

Added

Core Features

• Modbus TCP client implementation with full protocol support
• Modbus RTU client implementation with CRC16 checksum
• Modbus ASCII client implementation with LRC checksum
• Support for 11 common Modbus function codes:
  • Read Coils (FC 01)
  • Read Discrete Inputs (FC 02)
  • Read Holding Registers (FC 03)
  • Read Input Registers (FC 04)
  • Write Single Coil (FC 05)
  • Write Single Register (FC 06)
  • Write Multiple Coils (FC 15)
  • Write Multiple Registers (FC 16)
  • Mask Write Register (FC 22)
  • Read/Write Multiple Registers (FC 23)
  • Read FIFO Queue (FC 24)

Data Conversion Utilities

• Type-safe data conversion for all common data types
• Support for int16/32, uint16/32, float32/64, strings, booleans
• Configurable byte order (big-endian/little-endian)
• Bit manipulation utilities

Point Table Configuration

• RegisterMap class for device register definitions
• JSON serialization support for register configurations
• Automatic data type conversion and scaling (multiplier/offset)
• Support for all register types (coils, discrete inputs, input/holding registers)

Server Implementation

• Modbus TCP Server for slave/server simulation
• YAML configuration loader for point tables
• Random data generator for testing

Simulator Tools

• Standalone slave simulator with random data generation
• Standalone master simulator with point table polling
• YAML-based device configuration
• Support for TCP protocol (RTU/ASCII coming soon)

Documentation

• Comprehensive dartdoc comments for all public APIs
• Complete usage examples for all features
• Detailed README with advanced features section

Testing

• Unit tests for CRC16 checksum calculation
• Unit tests for LRC checksum calculation
• Unit tests for all data type conversions
• 29 passing tests with 100% coverage of core utilities

Technical Details

• Pure Dart implementation (no native dependencies for TCP)
• Type-safe with full Dart null safety support
• Zero external dependencies (except yaml for configuration)
• Efficient byte manipulation with typed data
• Provider pattern for protocol abstraction