Struct InMemoryModbusService 

pub struct InMemoryModbusService { /* private fields */ }

Thread-safe in-memory Modbus device simulator.

Implements ModbusService with support for all standard function codes (FC01–FC08, FC15–FC16, FC22–FC24) plus FC17 (Report Server ID) and FC43/0x0E (Read Device Identification).

Useful for testing client code without physical hardware.

Implementations

impl InMemoryModbusService

pub fn new( coil_count: usize, discrete_input_count: usize, holding_register_count: usize, input_register_count: usize, ) -> Self

Create a new simulator with the given address space sizes.

pub fn with_model(model: InMemoryPointModel) -> Self

Create a simulator from an existing InMemoryPointModel.

pub fn snapshot(&self) -> Result<InMemoryPointModel, ServiceError>

Clone the current state of all address spaces.

pub fn set_coil(&self, address: u16, value: bool) -> Result<(), ServiceError>

Set a coil value at the given address.

pub fn set_discrete_input( &self, address: u16, value: bool, ) -> Result<(), ServiceError>

Set a discrete input value at the given address.

pub fn set_holding_register( &self, address: u16, value: u16, ) -> Result<(), ServiceError>

Set a holding register value at the given address.

pub fn set_input_register( &self, address: u16, value: u16, ) -> Result<(), ServiceError>

Set an input register value at the given address.

pub fn coil(&self, address: u16) -> Result<Option<bool>, ServiceError>

Read a coil value at the given address.

pub fn holding_register( &self, address: u16, ) -> Result<Option<u16>, ServiceError>

Read a holding register value at the given address.

Trait Implementations

impl Debug for InMemoryModbusService

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl ModbusService for InMemoryModbusService

fn handle( &self, unit_id: UnitId, request: DecodedRequest<'_>, response_pdu: &mut [u8], ) -> Result<usize, ServiceError>

Handle a decoded request and write a response PDU into response_pdu.