MQTT: WIP. Added handling of received messages (subscriptions)
Dropped perfect hash in favor of bisection
Also fixed indentation (tabs)
<xsd:element name="Xenomai">
<xsd:complexType>
%(toolchain_gcc)s
<xsd:attribute name="XenoConfig" type="xsd:string" use="optional" default="xeno-config"/>
</xsd:complexType>
</xsd:element>