Enum mqtt::QoS

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

Quality of Service levels

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 Debug for QoS

fn fmt(&self, __arg_0: &mut Formatter) -> Result

Formats the value using the given formatter.

impl Clone for QoS

fn clone(&self) -> QoS

Returns a copy of the value.

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

Performs copy-assignment from source.

impl Copy for QoS

impl PartialEq for QoS

fn eq(&self, __arg_0: &QoS) -> bool

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

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

This method tests for !=.

impl Eq for QoS

impl From<u8> for QoS

fn from(u: u8) -> Self

Performs the conversion.

impl Into<u8> for QoS

fn into(self) -> u8

Performs the conversion.