Struct StdTcpTransport 

pub struct StdTcpTransport { /* private fields */ }

A concrete implementation of ModbusTcpTransport using std::net::TcpStream.

This struct manages a standard TCP connection for Modbus TCP communication.

Implementations

impl StdTcpTransport

pub fn new() -> Self

Creates a new StdTcpTransport instance.

Initially, there is no active connection.

Arguments

• config - The ModbusConfig to use for this transport.

Returns

A new StdTcpTransport instance with the provided configuration and no active connection.

Trait Implementations

impl Debug for StdTcpTransport

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

Formats the value using the given formatter.

impl Default for StdTcpTransport

fn default() -> StdTcpTransport

Returns the “default value” for a type.

impl Transport for StdTcpTransport

fn connect(&mut self, config: &ModbusConfig) -> Result<(), Self::Error>

Establishes a TCP connection to the specified remote address.

Arguments

• addr - The address of the Modbus TCP server (e.g., “192.168.1.1:502”).
• config - The ModbusTcpConfig containing the host and port of the Modbus TCP server.

Returns

Ok(()) if the connection is successfully established, or an error otherwise.

fn disconnect(&mut self) -> Result<(), Self::Error>

Closes the active TCP connection.

If no connection is active, this operation does nothing and returns Ok(()).

fn send(&mut self, adu: &[u8]) -> Result<(), Self::Error>

Sends a Modbus Application Data Unit (ADU) over the TCP connection.

Arguments

• adu - The byte slice representing the ADU to send.

Returns

Ok(()) if the ADU is successfully sent, or an error otherwise.

fn recv(&mut self) -> Result<Vec<u8, MAX_ADU_FRAME_LEN>, Self::Error>

Receives available Modbus bytes from the TCP connection.

This implementation performs a single, non-blocking read operation. It retrieves whatever bytes are currently available in the socket buffer up to the maximum ADU size. The higher-level Modbus Client Services (ClientServices::ingest_frame) is responsible for buffering and isolating the complete frames.

Returns

Ok(Vec<u8, MAX_ADU_FRAME_LEN>) containing the received bytes, or an error otherwise.

fn is_connected(&self) -> bool

Checks if the transport is currently connected to a remote host.

This is a best-effort check and indicates if a TcpStream is currently held.

const TRANSPORT_TYPE: TransportType = TransportType::StdTcp

Compile-time transport type metadata.

type Error = TransportError

The specific error type returned by this transport implementation. It must be convertible into the common MbusError for upper-layer processing.

const SUPPORTS_BROADCAST_WRITES: bool = false

Compile-time capability flag for Serial-style broadcast write semantics.