Enum ntex_mqtt::types::QoS

#[repr(u8)]pub enum QoS {
    AtMostOnce,
    AtLeastOnce,
    ExactlyOnce,
}

Quality of Service

Variants

AtMostOnce

At most once delivery

The message is delivered according to the capabilities of the underlying network. No response is sent by the receiver and no retry is performed by the sender. The message arrives at the receiver either once or not at all.

AtLeastOnce

At least once delivery

This quality of service ensures that the message arrives at the receiver at least once. A QoS 1 PUBLISH Packet has a Packet Identifier in its variable header and is acknowledged by a PUBACK Packet.

ExactlyOnce

Exactly once delivery

This is the highest quality of service, for use when neither loss nor duplication of messages are acceptable. There is an increased overhead associated with this quality of service.

Trait Implementations

impl Clone for QoS

fn clone(&self) -> QoS

Returns a copy of the value.

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

Performs copy-assignment from source.

impl Copy for QoS

impl Debug for QoS

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

Formats the value using the given formatter.

impl Eq for QoS

impl PartialEq<QoS> for QoS

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

This method tests for self and other values to be equal, and is used by ==.

#[must_use]pub fn ne(&self, other: &Rhs) -> bool

This method tests for !=.

impl StructuralEq for QoS

impl StructuralPartialEq for QoS

impl TryFrom<u8> for QoS

type Error = DecodeError

The type returned in the event of a conversion error.

fn try_from(v: u8) -> Result<Self, Self::Error>

Performs the conversion.