Module ack 

HL7 v2 acknowledgement messages.

A sender waits for an ACK message, not for the single <ACK> control byte: the byte says “the bytes arrived”, while the message says “the application accepted it, and here is the control id it accepted”. An interface engine that receives a bare control character generally treats the exchange as failed and retries, so a listener that answers with one looks healthy while every message is resent.

The reply echoes the sender’s MSH-10 in MSA-2, which is how the sender matches an acknowledgement to the message it sent.

Structs

InboundHeader

What the listener needs from an inbound message to answer it.

Enums

AckCode

MSA-1, the acknowledgement code.

Functions

build_ack

Builds an ACK message replying to header.