beremiz

MQTT: Fix warning when subscribing first topic from python.

16 months ago, Edouard Tisserant
089ecd14deb3
MQTT: Fix warning when subscribing first topic from python.

Ensure that message callback is already set before subscribing a topic from python.
PLC variables and local variables
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PLC variables start with ``/``
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Local Page variables start with ``.``
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Local HMI variables
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