pub unsafe extern "C" fn coap_get_block(
pdu: *const coap_pdu_t,
number: coap_option_num_t,
block: *mut coap_block_t,
) -> c_int
pub unsafe extern "C" fn coap_get_block(
pdu: *const coap_pdu_t,
number: coap_option_num_t,
block: *mut coap_block_t,
) -> c_int