Two apps based on Java SE and one based on Android that can send and receive packets using multicast socket.
How it work:
You always have to start a receiver firstly (Android or SocketMultiCastReceiver). After that, try to run the senders (Android or SocketSender).
SocketMultiCastReceiver - start a multicast socket receiver
SocketSender - send packets via multicast
SocketMultiCast Android - Can receive and send multicast packets