MQTT: Implements reconnecting in publish thread in case thread is waken-up but client is disconnected.
Note: paho's lostConnection callback got already disabled in previous commit.
# opcua/__init__.py
from .client import OPCUAClient
# class RootClass(object):
# XSD = """<?xml version="1.0" encoding="ISO-8859-1" ?>
# <xsd:schema xmlns:xsd="http://www.w3.org/2001/XMLSchema">
# </xsd:schema>
# """
# CTNChildrenTypes = [("OPCUAClient", OPCUAClient, "OPCUA Client")]
#