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.
<?xml version="1.0" encoding="UTF-8"?>
<BeremizRoot URI_location="LOCAL://">
<TargetType/>
</BeremizRoot>