Not sure I am following, the idea was to take the HL7 message, encode it, and put it into the osuwmc.Nutrition.OSU.CBOARDNetMenuRequest.SendMessageRequest  as the encodedMessage. Using the osuwmc.Nutrition.OSU.CBOARDNetMenuRequest.SendMessageRequest  to pass to the Web Service Class to send outbound to the vendor.

The two Parenthesis was a typo, and I was using the $Get(a) to dereference the %Stream to a string for the osuwmc.Nutrition.OSU.CBOARDNetMenuRequest.SendMessageRequest.

The Soap wizard created the osuwmc.Nutrition.OSU.CBOARDNetMenuRequest.SendMessageRequest as the vendor requires a key value and encoded message in the body of the soap request.

@Evgeny Shvarov, it makes sense I just haven't had the time to investigate.

Still not working right..

Class osuwmc.Nutrition.OSU.CBOARDNetMenuOperation.CBORDHL7Port Extends Ens.BusinessOperation [ ProcedureBlock ]
{

Parameter ADAPTER = "EnsLib.SOAP.OutboundAdapter";

Property LocalInterface As %String(MAXLEN = 255);

Parameter SETTINGS = "LocalInterface:Connection:selector?context={Ens.ContextSearch/TCPLocalInterfaces}";

Method OnInit() As %Status
{
	If 'IsObject(..Adapter.%Client.HttpRequest) {
		Set ..Adapter.%Client.HttpRequest=##class(%Net.HttpRequest).%New()
	}
	Set ..Adapter.%Client.HttpRequest.LocalInterface=$ZStrip($P(..LocalInterface,"("),"*W")
}

Terminating Job 819984 / 'NutritionCBOARDNetMenuSOAP' with Status = ERROR <Ens>ErrException: <SUBSCRIPT>OnInit+1^osuwmc.Nutrition.OSU.CBOARDNetMenuOperation.CBORDHL7Port.1 *IsObject("") -- logged as '-' number - @' If 'IsObject(..Adapter.%Client.HttpRequest) {', %QuitTask=

Class osuwmc.Nutrition.OSU.CBOARDNetMenuOperation.CBORDHL7Port Extends (Ens.BusinessOperation, EnsLib.SOAP.GenericOperation) [ ProcedureBlock ]
{

Parameter ADAPTER = "EnsLib.SOAP.OutboundAdapter";

Property LocalInterface As %String(MAXLEN = 255);

Parameter SETTINGS = "LocalInterface:Connection:selector?context={Ens.ContextSearch/TCPLocalInterfaces}";

Method OnInit() As %Status
{
	set interface = $ZStrip($P(..LocalInterface,"("),"*W")
    Set ..%Client.HttpRequest=##class(%Net.HttpRequest).%New()
	set ..%Client.HttpRequest.LocalInterface = interface
	QUIT $$$OK
}

I tried using ..%Client but got..

ERROR: osuwmc.Nutrition.OSU.CBOARDNetMenuOperation.CBORDHL7Port.cls

ERROR:  osuwmc.Nutrition.OSU.CBOARDNetMenuOperation.CBORDHL7Port.1(4) : MPP5376 : Method or Property '%Client' does not exist in this class.

 TEXT:   Set ..%Client.HttpRequest=##class(%Net.HttpRequest).%New()

ERROR:  osuwmc.Nutrition.OSU.CBOARDNetMenuOperation.CBORDHL7Port.1(5) : MPP5376 : Method or Property '%Client' does not exist in this class.

 TEXT:  set ..%Client.HttpRequest.LocalInterface = interface

When I tried to compile.

I ended up doing..

Class osuwmc.Nutrition.OSU.CBOARDNetMenuOperation.CBORDHL7Port Extends (Ens.BusinessOperation, EnsLib.SOAP.GenericOperation) [ ProcedureBlock ]
{

Parameter ADAPTER = "EnsLib.SOAP.OutboundAdapter";

Property LocalInterface As %String(MAXLEN = 255);

Parameter SETTINGS = "LocalInterface:Connection:selector?context={Ens.ContextSearch/TCPLocalInterfaces}";

Method OnInit() As %Status
{
	set interface = $ZStrip($P(..LocalInterface,"("),"*W")
	set HttpRequest = ##class(%Net.HttpRequest).%New()
	set HttpRequest.LocalInterface = interface
	$$$LOGINFO("CBORDHL7Port OnInit: LocalInterface="_interface)
	QUIT $$$OK
}

The $$$LOGINFO is showing the correct address, but I am still having issues connecting. But thanks

Thanks responseData.items.%Get(0).titles.%Get(0).value.%Get("en_US") did the trick

After talking with the vendor, they mentioned they had a .wsdl that could be used to send the HL7 message via a SOAP connection. I took the wsdl and ran it through the SOAP wizard to create the basic classes. Now we are waiting on a firewall request to allow us to communicate with the vendor over port 443.

Typically, it would only be one message schema, but I understand what you mean by creating a copy of the EnsLib.HL7.Operation.TCPOperation. I'll keep that in mind if I want to explore this further.

Adding a Pre-Processing Router on top seems like it would work, but it's not really efficient when you are struggling with processing, cpu, memory etc... it adds another process on top of everything else.

My task class is calling another Method in another class file that is set to write, but when the Task ran, I got was a blank Output File.

I have an Identifier that I receive in an HL7 MFN message, I need to take this Identifier and find the Locations that the Identifier is associated with, so I can set the Sending Facility value within the HL7 message to help filter out specific locations from being sent to the Health Share Provider Directory.
for example... ID1 might be associated with Site 1, Site 3. IF site 1 is valued and equals xxx, then send on else do not send on.

interesting theory to try, someone on my team changed it to cover it to stream, and put it back into the message before this answer. the Physician memory usage went down, the virtual memory usage went up. However, the error seemed more at the Routing than the DTL. It may have something to do with Locking and trying to send to multiple locations in a single send.

I ended up doing a BS for each query that I was pulling into an Internal Cache Table. Adding a Service and BP would cause more overhead system resource wise.