Apparently, the version I had installed had a bug in it. The DeviceTypes.xml configuration was not working. After installing a newer version of PM, I was successful in identifying my device as server, thus being able to extract collected data for the device.
For devices identified as 'others' there is no way to extract data from the system. The sysObjectID of devices have to be manually added to 'DeviceTypes.xml' configuration file under $KARAF_HOME/custom/devicetypes/DeviceTypes.xml.