beremiz

MQTT: WIP, re-organized disconnection handling, now keep track of connection status and reconnect accordingly.

This fixes bug with non-reconnecting to broker when having no published variables.
<xsd:element name="Linux">
<xsd:complexType>
<xsd:attribute name="RealTime" type="xsd:boolean" use="optional" default="false"/>
%(toolchain_gcc)s
</xsd:complexType>
</xsd:element>