I was able to do something like that that takes HL7 messages and publishes them to GCP using the Java/ObjectScript code found here: github.com/mcmundt/isc-gcp-pubsub. Originally set this it up on HS 2020 which was relatively straightforward - mostly a matter of getting all the libraries worked out. I recently migrated that interface to HS 2024 which took some tweaking because of move to using External Language Servers/PEX components, switching from the intersystems-gateway-3.1.0 to intersystems-utils-4.1.5 library, and changes to com.intersystems.enslib.pex package that required some small changes to the original Java code.
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