Enum SendError 

#[non_exhaustive]
pub enum SendError {
    ProtocolTooOld {
        serial: String,
        opcode: u16,
        have: u16,
        need: u16,
    },
    UnknownOpcode {
        opcode: u16,
    },
    NotConnected,
    Io(Error),
}

Why a frame was not sent.

Variants (Non-exhaustive)

Non-exhaustive enums could have additional variants added in future. Therefore, when matching against variants of non-exhaustive enums, an extra wildcard arm must be added to account for any future variants.

ProtocolTooOld

The addressed device speaks a protocol older than the opcode requires.

A receiver silently drops any frame stamped above its own version, with no NAK, so sending anyway would report success and change nothing.

Fields

serial: String

Serial number of the addressed device.

opcode: u16

The opcode that was refused.

have: u16

The protocol version the device reports.

need: u16

The version the opcode requires.

UnknownOpcode

The opcode has no entry in the protocol table, so there is no version to stamp it with.

Nothing this library sends can reach this: every opcode it declares has an entry, and a test holds that true. It exists so that adding one without an entry fails at the send rather than going out stamped with a guess.

Fields

opcode: u16

The opcode that has no entry.

NotConnected

The client is not connected, because it was never started or has been closed.

Io(Error)

The socket write failed.

Trait Implementations

impl Debug for SendError

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

Formats the value using the given formatter.

impl Display for SendError

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

Formats the value using the given formatter.

impl Error for SendError

fn source(&self) -> Option<&(dyn Error + 'static)>

Returns the lower-level source of this error, if any.

fn description(&self) -> &str

👎Deprecated since 1.42.0:

use the Display impl or to_string()

fn cause(&self) -> Option<&dyn Error>

👎Deprecated since 1.33.0:

replaced by Error::source, which can support downcasting

fn provide<'a>(&'a self, request: &mut Request<'a>)

🔬This is a nightly-only experimental API. (error_generic_member_access)

Provides type-based access to context intended for error reports.

impl From<Error> for SendError

fn from(e: Error) -> Self

Converts to this type from the input type.

impl From<SendError> for ControlError

fn from(e: SendError) -> Self

Converts to this type from the input type.