Request template Function Relay multicast traffic from mcast_addr:mport: Display udpxy status.udpxy ('you-dee-pixie') is a data stream relay: it reads data streams from a multicast groups and forwards the data to the Web-enabled: web-based control and display of status and traffic statistics.This function can convert multicast UDP streams to unicast HTTP streams. Use this function to run the IPTV application (such as VLC) on several computers at the same time.