** add the actual library reference ('org.openhab.io.transport.mqtt') to ''META-INF/MANIFEST.MF''
** add reference to OSGI Declarative Service (DS)
*** in ''OSGI-INF/
**org.openhab.binding.marlinfireplace.internal.MarlinFireplaceHandlerFactory.xml'' add <pre> <<reference bind="setMqttService" cardinality="1..1" interface="org.openhab.io.transport.mqtt.MqttService" name="MqttService" policy="static" unbind="unsetMqttService"/>>
</pre>** implement the methods in the named class (this case ''org.openhab.binding.marlinfireplace.internal.MarlinFireplaceHandlerFactory'')** <pre>public void setMqttService(MqttService mqttService) {}public void unsetMqttService(MqttService mqttService)</pre>