Enum mosquitto_rs::QoS

pub enum QoS {
    AtMostOnce,
    AtLeastOnce,
    ExactlyOnce,
}

Variants

AtMostOnce

This is the simplest, lowest-overhead method of sending a message. The client simply publishes the message, and there is no acknowledgement by the broker.

AtLeastOnce

This method guarantees that the message will be transferred successfully to the broker. The broker sends an acknowledgement back to the sender, but in the event that that the acknowledgement is lost the sender won't realise the message has got through, so will send the message again. The client will re-send until it gets the broker's acknowledgement. This means that sending is guaranteed, although the message may reach the broker more than once.

ExactlyOnce

This is the highest level of service, in which there is a sequence of four messages between the sender and the receiver, a kind of handshake to confirm that the main message has been sent and that the acknowledgement has been received. When the handshake has been completed, both sender and receiver are sure that the message was sent exactly once.

Trait Implementations

impl Clone for QoS

pub 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

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

Formats the value using the given formatter.

impl Default for QoS

pub fn default() -> QoS

Returns the "default value" for a type.

impl Eq for QoS

impl PartialEq<QoS> for QoS

pub 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