Struct Acknowledgement 

pub struct Acknowledgement {
    pub sequence_number: u16,
    pub arrived: bool,
    pub arrival: Option<Duration>,
    pub ecn: Ecn,
}

One packet’s fate, as reported by the receiver.

arrival is a Duration rather than an Instant because it is measured on the receiver’s clock, which this endpoint has no way to align with its own. Only differences between arrivals are meaningful, and those are what congestion control actually reads: the spread between send spacing and arrival spacing is the delay the path is imposing.

Each feedback format supplies its own epoch — TWCC’s 24-bit reference time, RFC 8888’s report timestamp — and both advance monotonically, so arrivals stay comparable across successive reports of the same format. They are not comparable between formats.

Fields

sequence_number: u16

The sequence number this refers to. TWCC numbers packets itself; RFC 8888 uses the RTP sequence number of the stream it names.

arrived: bool

Whether the receiver got it.

arrival: Option<Duration>

When it arrived, on the receiver’s clock. None for a packet that did not arrive, or one reported as received without a usable arrival time.

ecn: Ecn

The ECN marking the receiver observed. TWCC cannot carry this and always reports NotEct.

Implementations

impl Acknowledgement

pub fn lost(sequence_number: u16) -> Self

A packet the receiver did not get.

pub fn received( sequence_number: u16, arrival: Option<Duration>, ecn: Ecn, ) -> Self

A packet the receiver got at arrival on its own clock.

Trait Implementations

impl Clone for Acknowledgement

fn clone(&self) -> Acknowledgement

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Copy for Acknowledgement

impl Debug for Acknowledgement

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

Formats the value using the given formatter.

impl Eq for Acknowledgement

impl PartialEq for Acknowledgement

fn eq(&self, other: &Acknowledgement) -> bool

Equality operator ==.

fn ne(&self, other: &Rhs) -> bool

Inequality operator !=.

impl StructuralPartialEq for Acknowledgement