Type Alias paho_mqtt_sys::MQTTAsync_traceCallback

pub type MQTTAsync_traceCallback = Option<unsafe extern "C" fn(level: MQTTASYNC_TRACE_LEVELS, message: *mut c_char)>;

Aliased Type

enum MQTTAsync_traceCallback {
    None,
    Some(unsafe extern "C" fn(_: u32, _: *mut i8)),
}

Variants

None

No value.

Some(unsafe extern "C" fn(_: u32, _: *mut i8))

Some value of type T.