Node Red: A widget based dashboard working with Homey trough MQTT

could you please share a functioning example. if i copy the script provided by Tangodelta i get three seperate nodes. i tried to connect them, change URL to a test RTSP (rtsp://wowzaec2demo.streamlock.net/vod/mp4:BigBuckBunny_115k.mov) but i cant get it working.