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.
Overview: IDE and runtime(s)
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..
TODO: take content from https://hg.beremiz.org/beremiz_docs/
PLCopen TC6 based Model-View-Controller Editor
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Toolchain
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Runtimes
--------
Python runtime
^^^^^^^^^^^^^^
C runtime
^^^^^^^^^
Extensions
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Fieldbusses
^^^^^^^^^^^
HMI
^^^
I/Os
^^^^
Integration
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