Type Alias io_func 

pub type io_func = Option<unsafe extern "C" fn(*mut esp_transport_item_t, *const u8, i32, i32) -> i32>;

Aliased Type

pub enum io_func {
    None,
    Some(unsafe extern "C" fn(*mut esp_transport_item_t, *const u8, i32, i32) -> i32),
}

Variants

None

No value.

Some(unsafe extern "C" fn(*mut esp_transport_item_t, *const u8, i32, i32) -> i32)

Some value of type T.