modbus_codec 0.1.1

Transport-agnostic Modbus RTU codec for Dart. Encode request frames and decode raw response bytes into typed values over BLE, serial, or TCP.

0.1.1

• Input validation for slaveId, address, and quantity limits on all function codes.
• ReadBitsResponse now returns all byteCount * 8 bits; caller slices to request quantity.
• Decoder throws ModbusFrameException on malformed frames instead of crashing.
• ModbusConvert guards for non-ASCII input, negative scale factor, and padToRegisters overflow.

0.1.0

Initial release.

• ModbusEncoder for building RTU request frames: read coils / discrete inputs / holding registers / input registers (FC 01–04), and write single & multiple coils / registers (FC 05, 06, 15, 16).
• ModbusDecoder for parsing RTU response bytes into typed responses (ReadRegistersResponse, ReadBitsResponse, WriteSingleResponse, WriteMultipleResponse), with optional CRC validation.
• Crc16Modbus — CRC-16/MODBUS compute, byte generation, and validation.
• ModbusConvert helpers: signed 16/32-bit, 32-bit register pairing with selectable word order, fixed-point scaling, and packed-ASCII encode/decode.
• ModbusDeviceException / ModbusFrameException for device-reported errors and malformed frames.
• Zero runtime dependencies; pure Dart.