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.

[0.3.0] - 2025.xx.xx

Alot of breaking changes. Biggest things:

Introduced Field struct to be used instead of modbus.BField. BField and fluent interface is deprecated. When adding fields in bulk and dynamically the struct (more idiomatic) approach is more ergonomic than fluent API.
Added implementation of Poller in poller package. For example usage see cmd/modbus-poller/main.go

Breaking changes to following structs/methods/functions

struct field modbus.Field.RegisterAddress was renamed to Address
struct modbus.RegisterRequest was renamed to BuilderRequest
method BuilderRequest.ExtractFields() signature changed
removed type packet.LooksLikeType and related consts
- const packet.DataTooShort
- const packet.IsNotTPCPacket
- const packet.LooksLikeTCPPacket
- const packet.UnsupportedFunctionCode
error modbus.ErrClientNotConnected: changed from ClientError to *ClientError
error modbus.ErrPacketTooLong: changed from ClientError to *ClientError

Added

Added FC1/FC2 support to builder. You can register coils with b.Coild(address) to be requested and extracted. Builder has now following methods for splitting:
- ReadCoilsTCP combines fields into TCP Read Coils (FC1) requests
- ReadCoilsRTU combines fields into RTU Read Coils (FC1) requests
- ReadDiscreteInputsTCP combines fields into TCP Read Discrete Inputs (FC2) requests
- ReadDiscreteInputsRTU combines fields into RTU Read Discrete Inputs (FC2) requests

[0.2.0] - 2024.02.04

Added

Added support for FC17 (0x11) Read Server ID.
Added packet.LooksLikeModbusTCP() to check if given bytes are possibly TCP packet or start of packet.
Added Parse*Request* for every function type to help implement Modbus servers.
Added Server package to implement your own modbus server

[0.0.1] - 2021-04-11

Added

First implementations