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
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>
This method returns an ordering between self
and other
values if one exists. Read more
1.0.0 · sourcefn lt(&self, other: &Rhs) -> bool
fn lt(&self, other: &Rhs) -> bool
This method tests less than (for self
and other
) and is used by the <
operator. Read more
1.0.0 · sourcefn le(&self, other: &Rhs) -> bool
fn le(&self, other: &Rhs) -> bool
This method tests less than or equal to (for self
and other
) and is used by the <=
operator. Read more
impl Copy for Type
impl Eq for Type
impl StructuralEq for Type
impl StructuralPartialEq for Type
Auto Trait Implementations
impl RefUnwindSafe for Type
impl Send for Type
impl Sync for Type
impl Unpin for Type
impl UnwindSafe for Type
Blanket Implementations
sourceimpl<T> BorrowMut<T> for T where
T: ?Sized,
impl<T> BorrowMut<T> for T where
T: ?Sized,
const: unstable · sourcefn borrow_mut(&mut self) -> &mut T
fn borrow_mut(&mut self) -> &mut T
Mutably borrows from an owned value. Read more