feat: support "AE" type in sendResponse()

[jtarvainen]

Feature Request

Describe the Feature Request

sendResponse() only supports type values "AA" (Application Accept) or "AR" (Application Reject); the value "AE" (Application Error) is only used if formulating a response fails.

The "AR" type is commonly interpreted to indicate issues with the MSH-9, MSH-11 and/or MSH-12 fields. As such, it may not be applicable if the message itself is valid but cannot be processed for some other reason (e.g. the data not being relevant to the recipient).

We have a client device that expects to receive a response of type "AE" in case of errors not related to message validity. Please add support for setting this response type manually.

Describe Preferred Solution

Add "AE" as one of the accepted response types in sendResponse. Note that _createAckMessage should construct the MSA segment of the "AE" response in the same way as that of the other response types:

    const segment = ackMessage.addSegment('MSA')
    segment.set('1', type) // <-- this should also allow "AE"
    segment.set('2', message.get('MSH.10').toString())

If the feature request is approved, would you be willing to submit a PR?

Yes

[Bugs5382]

@jtarvainen Care to review the code I just pushed up?

[jtarvainen]

@Bugs5382 Thanks for taking care of this so fast! I checked out the change; looks good to me! 👍

[Bugs5382]

@jtarvainen I give develop at least a few days for testing so this way medical applications are good.