Habarisoft plans to introduce support for non-Unicode Delphi version (6 to 2007) in the next release of its Object Pascal STOMP client libraries.
Habari Client users may now sign up for the closed beta test, which is scheduled for January 2019. Just send an e-mail and get notified as soon as the first beta is available.
Update (5 January 2019)
About Habari Client libraries
Habari Client libraries enable Object Pascal applications to take advantage of message broker / message queue technology – which is distributed, loosely coupled, reliable and asynchronous – to build integrated systems, using peer-to-peer and publish-subscribe communication models.