yes, both devices are connected with the same network (Wifi) Note: No internet access.

Thanks for your response We have the option to use both protocols but we are using UDP protocol. We just don't want to make it secure as we are using UDP. We basically want to broadcast our device, so all other devices can discover us. (android & iOS) and why this group Multicasting demo is not working? (https://developer.apple.com/news/?id=0oi77447)

Thanks for your concern, I am using this link [https://developer.apple.com/news/?id=0oi77447) and want to communicate with two devices. I can't found multicast capabilities in XCode.