UDP prototype¶

Goals¶

• Make a program which will listen for multicast message.
• It must be work between sub-networks (vlan).
• It should be also able to send. User can type a message and all other peers will print it when it is sent.
• Test it with some computers.

Qt and UDP multicast¶

There is no support to UDP multicast in QT4.5 according this bug issue : http://www.qtsoftware.com/developer/task-tracker/index_html?method=entry&id=57952.

But it's possible to use setsockopt() with QAbstractSocket::socketDescriptor(). See http://linux.die.net/man/7/ip and options for multicast like IP_ADD_MEMBERSHIP.

References¶

• http://en.wikipedia.org/wiki/Multicast
• http://tldp.org/HOWTO/Multicast-HOWTO-6.html