Splitting stream into HL7 messages

Hi,

I want to consume an API that provides HL7 messages. To achieve this, I have thought of the following workflow:

I have created a business service that periodically triggers a business process. The trigger request is forwarded to a business operation. There, a %Net.HttpRequest is assembled from scratch and then sent to the API endpoint. The corresponding HttpResponse then contains several HL7 messages encoded in UTF-8 in the message body. To further process the HL7 messages, the operation sends the HttpResponse back to the business process as EnsLib.HTTP.GenericMessage.

The raw data looks like this:

MSH|^~\&|Doctolib||Doctolib||20251028154100||SIU^S12|d50f01e649cda79faf29|P|2.5.1|||||FRA|UTF-8
SCH||20771389^Doctolib||||Vor.Tagesk^Vorgespräch für Tagesklinik|||||^^15^202511101000|||||117134^Mustermann^Stefan||||Doctolib|||||Booked
NTE|||Hier der Inhalt des Notizfeldes.  Achten Sie auf Umlaute: ä ö ü   (UTF-8)
PID|||56834111^^^Doctolib^PI||Testfrau^Liselotte^^^^^L||19690722|F|||||+4917612345678^^^liselotte@test.de~+4940123456
RGS|1
AIG|1|||Vorg-Tagesklinik^Vorgespräche Tagesklinik
MSH|^~\&|Doctolib||Doctolib||20251028154114||SIU^S13|39e482e10fa61ccd4500|P|2.5.1|||||FRA|UTF-8
SCH||20771389^Doctolib||||Vor.Tagesk^Vorgespräch für Tagesklinik|||||^^15^202511141600|||||117134^Mustermann^Stefan||||Doctolib|||||Booked
NTE|||Hier der Inhalt des Notizfeldes.  Achten Sie auf Umlaute: ä ö ü   (UTF-8)
PID|||56834111^^^Doctolib^PI||Testfrau^Liselotte^^^^^L||19690722|F|||||+4917612345678^^^liselotte@test.de~+4940123456
RGS|1
AIG|1|||Vorg-Tagesklinik^Vorgespräche Tagesklinik
MSH|^~\&|Doctolib||Doctolib||20251028154225||SIU^S17|1e5726345c7b4257b41f|P|2.5.1|||||FRA|UTF-8
SCH||20771388^Doctolib||||Vor.Tagesk^Vorgespräch für Tagesklinik|||||^^15^202511121600|||||117134^Mustermann^Stefan||||Doctolib|||||Deleted
NTE|||Hier der Inhalt des Notizfeldes
PID|||56834102^^^Doctolib^PI||Testmann^Heinrich^^^^^L||19881211|M|||||+4917612345678^^^heinrich@test.de~+4940123456
RGS|1
AIG|1|||Vorg-Tagesklinik^Vorgespräche Tagesklinik

The next step would be to split the message body into individual HL7 messages and then forward them accordingly. But splitting them up is causing me problems. In the message viewer, the stream is still displayed with line breaks. First, I tried to read the stream line by line and then save the individual streams in a collection (%ListOfObjects). However, the line breaks seem to get lost in the process.

Then I tried to save it in a collection of strings using the string “MSH|” (the start of the message) to split the stream. That worked, but unfortunately there were problems when converting the string to an EnsLib.HL7.Message because the framing did not fit.

How would you go about turning a stream with multiple HL7 messages into individual HL7 messages?

Regards

Robert