Commercial library by Step Function I/O
rodbus
Rust async/await implementation of the Modbus protocol using Tokio with idiomatic bindings for C/C++, Java, and .NET Core.
The library supports Modbus TCP, RTU, and TLS including role-based access control using the X.509 role identifier in the Modbus security specification.
License
Refer to License.txt for the terms of the non-commercial license. This software is "source available", but is not
"open source". You must purchase a commercial license to use this software for profit.
Library
The client and server examples demonstrate simple
usage of the API.
The following function codes are supported:
- Read Coils (
0x01) - Read Discrete Inputs (
0x02) - Read Holding Registers (
0x03) - Read Input Registers (
0x04) - Write Single Coil (
0x05) - Write Single Register (
0x06) - Write Multiple Coils (
0x0F) - Write Multiple Registers (
0x10)
The library uses the Tokio executor under the hood. The perf example is a benchmark that
creates multiple sessions on a single server and sends multiple requests in parallel. On a decent workstation,
the benchmark achieved around 200k requests per second spread across 100 concurrent sessions in only 800 KB of memory.
Bindings
Bindings in C, C++, .NET Core, and Java are available for this library. See the documentation for more details.
Modbus client CLI
You can test Modbus servers from the command line with the rodbus-client crate.