beremiz

WIP: Add skeleton for MQTT extension based on part of OPC-UA extension.

2024-06-12, Edouard Tisserant
76295adcf940
WIP: Add skeleton for MQTT extension based on part of OPC-UA extension.

For now generated code makes no sense but persistently-configurable-C-generating-extension infrastructure is there.
Widget syntax
=============
.. highlight:: text
HMI elements are SVG elements whose labels start with ``HMI:``::
HMI:WidgetType[|freq][[:param]...][[@a=path[,min][,max]]...][#expression]
Widget Type
-----------
Update Frequency
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Parameters
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Variable bindings
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Enable expression
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