Today we are pushing out a MQTT V311 client and data broker we've written in pure smalltalk. It is based on Tim Rowledge's earlier work, but as far as I know the only data broker in smalltalk.

https://github.com/LabWare/MQTT-broker

....
John M. McIntosh. Corporate Smalltalk Consulting Ltd https://www.linkedin.com/in/smalltalk
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