beremiz

MQTT: strip unsupported types from type choice dropdown, better wrong type detection in build.
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
----------------
Parameters
----------
Variable bindings
-----------------
Enable expression
-----------------