UPnPlayer is a simple UPnP/DLNA client for Android devices. The UI is old and rudimentary. It was able to detect my ReadyMedia server and I was able to browse its contents. However, I could not figure out how to add multiple music files and maintain a playlist. That was a deal breaker for me.
Tried with: UPnPlayer 2.1.1, Android 5.0.2 and Moto G2 (XT1068)