Use APKPure App
Get OPClient old version APK for Android
एंड्रॉयड के लिए OPC (ओपन संचार मंच) क्लाइंट
Client OPC in Android using stack OPC java, Eclipse and some library.
At the following link there are Server that i used in this example and documentation:
https://github.com/TommyR22/Android-OPC_Client