Function with_inmemory_as_msg_native 

pub fn with_inmemory_as_msg_native<'a, 'b: 'a, F, R>(
    msg: &'a mut Message<'b>,
    f: F,
) -> R
where
    F: FnOnce(oscore_msg_native_t) -> R,

Make a coap_message_implementations::inmemory_write::Message usable as a liboscore::raw::oscore_msg_native_t

This is a low-level function used by the high-level wrappers in the liboscore crate.

This is the sync equivalent of the async async_with_inmemory_as_msg_native. Same function, different color.