Myself and Rafael have been looking at ways to integrate Internet of Things devices with M based technology.
Some of the results can be found below:
This repo shows a full "end to end" demo using a Raspberry Pi as an IoT device, sending data to a mqtt message broker. Mg_python is then used to read data from the message broker and write to the database. Finally mg-web is used to present the data to Grafana (graphical display tool) via a rest API
This second repo provides an alternative to mg_python, using native M code to publish to a message broker.
In terms of VistA, some use cases could be:
1) Sending critical alerts similar to a paging system to end users via mobile phones.
2) Displaying messages on smart boards in hospitals.
3) Reading data from online medical IoT devices into VistA.
Hope this is useful to the community.
Ram