Notify metadata changes over MQTT

For WMO's WIS2, MQTT notifications (of metadata changes, sending the changes) would allow interoperability. There is a Python library from WMO's WIS2 to format the messages as required: https://github.com/wmo-im/pywis-pubsub . See details and tests with David Inglis Berry of WIS2.

Edited Dec 11, 2024 by Mathias Bavay

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