Crate rustmod_client 

High-level async Modbus client with automatic retries, timeouts, and throttling.

This crate provides ModbusClient, an ergonomic async client that wraps any DataLink transport and handles:

• PDU encoding/decoding via rustmod-core
• Configurable response timeouts
• Automatic retries with reconnection on transport errors
• Inter-request throttle delays for slow devices
• Request/response validation (echo checks, payload lengths)
• Optional metrics collection (metrics feature)

For synchronous (blocking) usage, see SyncModbusTcpClient.

Supported function codes

FC	Method
01	read_coils
02	read_discrete_inputs
03	read_holding_registers
04	read_input_registers
05	write_single_coil
06	write_single_register
07	read_exception_status
08	diagnostics
15	write_multiple_coils
16	write_multiple_registers
22	mask_write_register
23	read_write_multiple_registers
24	read_fifo_queue
17	report_server_id
43	read_device_identification

Re-exports

pub use points::CoilPoints;

pub use points::RegisterPoints;

pub use sync::SyncClientError;

pub use sync::SyncModbusTcpClient;

Modules

points

sync

Structs

ClientConfig

Configuration for a ModbusClient.

DeviceIdentificationObject

A single object returned in a FC43/0x0E (Read Device Identification) response.

ModbusClient

Async Modbus client that wraps a DataLink transport.

ReadDeviceIdentificationResponse

Response from FC43/0x0E (Read Device Identification).

ReportServerIdResponse

Response from FC17 (Report Server ID).

UnitId

A Modbus unit identifier (station address).

Enums

ClientError

Errors that can occur when executing a Modbus request through ModbusClient.

InvalidResponseKind

Describes why a Modbus response was considered invalid.

RetryPolicy

Controls which requests are eligible for automatic retry on transport errors.