Struct ConnectedSession

pub struct ConnectedSession {

    pub connection_id: u32,
    pub o_to_t_connection_id: u32,
    pub t_to_o_connection_id: u32,
    pub connection_serial: u16,
    pub originator_vendor_id: u16,
    pub originator_serial: u32,
    pub timeout_multiplier: u8,
    pub rpi: u32,
    pub o_to_t_params: ConnectionParameters,
    pub t_to_o_params: ConnectionParameters,
    pub established_at: Instant,
    pub is_active: bool,
    pub sequence_count: u16,
}

Connected session information for Class 3 explicit messaging

Allen-Bradley PLCs often require connected sessions for certain operations like STRING writes. This structure maintains the connection state.

Fields

connection_id: u32

Connection ID assigned by the PLC

o_to_t_connection_id: u32

Our connection ID (originator -> target)

t_to_o_connection_id: u32

PLC’s connection ID (target -> originator)

connection_serial: u16

Connection serial number for this session

originator_vendor_id: u16

Originator vendor ID (our vendor ID)

originator_serial: u32

Originator serial number (our serial number)

timeout_multiplier: u8

Connection timeout multiplier

rpi: u32

Requested Packet Interval (RPI) in microseconds

o_to_t_params: ConnectionParameters

Connection parameters for O->T direction

t_to_o_params: ConnectionParameters

Connection parameters for T->O direction

established_at: Instant

Timestamp when connection was established

is_active: bool

Whether this connection is currently active

sequence_count: u16

Sequence counter for connected messages (increments with each message)

Implementations

impl ConnectedSession

pub fn new(connection_serial: u16) -> Self

Creates a new connected session with default parameters

pub fn with_config(connection_serial: u16, config_id: u8) -> Self

Creates a connected session with alternative parameters for different PLCs

Trait Implementations

impl Clone for ConnectedSession

fn clone(&self) -> ConnectedSession

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for ConnectedSession

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

Formats the value using the given formatter.