Enum MqttError 

pub enum MqttError {
    MalformedPacket(String),
    Protocol(String),
    Io(String),
    ConnectionRefused(String),
    NotConnected,
    PacketTooLarge(String),
    AlreadyConnected,
    Timeout,
    Session(String),
}

All errors that can be produced while encoding/decoding MQTT packets or operating an MQTT client (stem-mqtt-client). The client crate exposes it to foreign languages through UniFFI as a plain error enum.

Variants

MalformedPacket(String)

The peer sent a packet that violates the MQTT specification.

Protocol(String)

A value could not be encoded/decoded per the wire protocol.

Io(String)

Underlying I/O failure (connection reset, DNS failure, etc.).

ConnectionRefused(String)

The broker rejected the connection attempt.

NotConnected

An operation was attempted while not connected to a broker.

PacketTooLarge(String)

A packet’s declared size exceeds the configured maximum packet size.

AlreadyConnected

The client is already connected.

Timeout

The peer did not acknowledge a QoS 1/2 packet before the timeout.

Session(String)

Generic keep-alive / session error.

Trait Implementations

impl Debug for MqttError

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

Formats the value using the given formatter.

impl Display for MqttError

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

Formats the value using the given formatter.

impl Error for MqttError

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 MqttError

fn from(e: Error) -> MqttError

Converts to this type from the input type.