pub enum Type {
Non,
Con,
Ack,
Reset,
}
Expand description
Indicates if this message is of type Confirmable (0), Non-confirmable (1), Acknowledgement (2), or Reset (3).
See RFC7252 - Message Details for context
Variants
Non
Some messages do not require an acknowledgement. This is particularly true for messages that are repeated regularly for application requirements, such as repeated readings from a sensor.
Con
Some messages require an acknowledgement. These messages are called “Confirmable”. When no packets are lost, each Confirmable message elicits exactly one return message of type Acknowledgement or type Reset.
Ack
An Acknowledgement message acknowledges that a specific Confirmable message arrived. By itself, an Acknowledgement message does not indicate success or failure of any request encapsulated in the Confirmable message, but the Acknowledgement message may also carry a Piggybacked Response.
Reset
A Reset message indicates that a specific message (Confirmable or Non-confirmable) was received, but some context is missing to properly process it. This condition is usually caused when the receiving node has rebooted and has forgotten some state that would be required to interpret the message. Provoking a Reset message (e.g., by sending an Empty Confirmable message) is also useful as an inexpensive check of the liveness of an endpoint (“CoAP ping”).
Trait Implementations
sourceimpl Ord for Type
impl Ord for Type
1.21.0 · sourcefn max(self, other: Self) -> Self
fn max(self, other: Self) -> Self
1.21.0 · sourcefn min(self, other: Self) -> Self
fn min(self, other: Self) -> Self
1.50.0 · sourcefn clamp(self, min: Self, max: Self) -> Selfwhere
Self: PartialOrd<Self>,
fn clamp(self, min: Self, max: Self) -> Selfwhere
Self: PartialOrd<Self>,
sourceimpl PartialOrd<Type> for Type
impl PartialOrd<Type> for Type
sourcefn partial_cmp(&self, other: &Type) -> Option<Ordering>
fn partial_cmp(&self, other: &Type) -> Option<Ordering>
1.0.0 · sourcefn le(&self, other: &Rhs) -> bool
fn le(&self, other: &Rhs) -> bool
self
and other
) and is used by the <=
operator. Read more