Struct Will 

pub struct Will {
    pub qos: QoS,
    pub retain: bool,
    pub delay_interval: u32,
    pub payload_format_indicator: bool,
    pub message_expiry_interval: Option<u32>,
    pub content_type: String,
    pub response_topic: Option<Topic>,
    pub correlation_data: Option<Vec<u8>>,
    pub user_properties: Vec<(String, String)>,
    pub topic: Topic,
    pub message: Vec<u8>,
}

Due to the unstable nature of a connexion, the client can loose its connection to the server. This ungraceful disconnect can be notified to every other clients by specifying a Last Will message that is given upon connection. When a client ungracefully disconnect from a server (when the keep alive is reached), the server will publish the Last Will message to anyone subscribed to its topic.

Fields

qos: QoS

The quality of service for the will message.

retain: bool

If the message is to be retained. A retain message is kept in memory by a broker (one per topic) to sent to future subscriptions.

delay_interval: u32

Delay in seconds the broker will wait after a deconnection before publishing the will message. The will message can also be published at session expires if it happens first.

payload_format_indicator: bool

If true, the will message will be a valid UTF-8 encoded string. If not the will message can be anything, even a unicorn.

message_expiry_interval: Option<u32>

Corresponds to the expiry interval of the Publish message sent.

content_type: String

Describes the type of content of the payload. Is generally a MIME descriptor.

response_topic: Option<Topic>

Optional topic used as response if the Will message is a request.

correlation_data: Option<Vec<u8>>

Optional correlation optionaly used if the Will message is a request.

user_properties: Vec<(String, String)>

General purpose properties

topic: Topic

The Last Will Topic. Cannot be empty.

message: Vec<u8>

The last will payload.

Implementations

impl Will

pub fn with_message(topic: Topic, message: &str) -> Self

Builds a default Will with specified topic and message

Trait Implementations

impl Clone for Will

fn clone(&self) -> Will

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for Will

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

Formats the value using the given formatter.

impl PartialEq for Will

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

Tests for self and other values to be equal, and is used by ==.

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

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl StructuralPartialEq for Will