Enum PreCheckOutcome 

pub enum PreCheckOutcome {
    Pass,
    NeedLength(usize),
    Fail(ModbusError),
    InsufficientData,
}

Outcome of a single PreCheck evaluation against an incoming Framing.

Mirrors the return values of master-session.ts’s preCheck functions (undefined | number | boolean).

Variants

Pass

This check accepts the frame; move on to the next check.

NeedLength(usize)

The frame’s data must be exactly this many bytes:

• data.len() < n → rejected as InsufficientData
• data.len() != n → rejected as InvalidResponse
• data.len() == n → passes

Fail(ModbusError)

Reject with the given error and stop pre-checking.

InsufficientData

Equivalent to njs undefined: the check can’t decide yet; treated as InsufficientData.

Trait Implementations

impl Clone for PreCheckOutcome

fn clone(&self) -> PreCheckOutcome

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for PreCheckOutcome

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

Formats the value using the given formatter.