String rootScopeStr = "1111111111111111";
ByteIdentifier rootId = new ByteIdentifier(Hex.decodeHex(rootScopeStr.toCharArray()));
rootScope = new ScopeID(rootId);
// immediately subscribe to the catalog
videoSubscriber = new VideoSubscriber(client, rootScope, strategy);
// initialise ridMappings
ridMappings = new HashMap<String, String>();
// Start the event handler