Function riot_sys::inline::coap_opt_put_string_with_len

unsafe extern "C" fn coap_opt_put_string_with_len(
    buf: *mut uint8_t,
    lastonum: uint16_t,
    optnum: uint16_t,
    string: *const c_char,
    len: size_t,
    separator: c_char,
) -> size_t