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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.
<?xml version='1.0' encoding='utf-8'?>
<ModbusRequest xmlns:xsd="http://www.w3.org/2001/XMLSchema" Function="04 - Read Input Registers" SlaveID="0" Start_Address="0"/>
