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

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

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Auto Trait Implementations

Blanket Implementations

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