Function libcoap_sys::coap_send_ack

pub unsafe extern "C" fn coap_send_ack(
    session: *mut coap_session_t, 
    request: *mut coap_pdu_t
) -> coap_tid_t

Sends an ACK message with code @c 0 for the specified @p request to @p dst. This function returns the corresponding transaction id if the message was sent or @c COAP_INVALID_TID on error.

@param session The CoAP session. @param request The request to be acknowledged.

@return The transaction id if ACK was sent or @c COAP_INVALID_TID on error.