Added Multicast UDP support

[aallan]

Patch to add multicast UDP support to the current Arduino Ethernet library.

[oberstet]

+1

[lgasp]

+1

[barbudor]

+1 too
very usefull

2013/11/19 lgasp notifications@github.com

+1

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[davidgraeff]

please add udp multicast support

[giampiero7]

+1

[roeften]

This patch works for me. I've written an example here:
http://blog.roeften.com/2015/03/multicast-communications-between.html

[ghost]

Well, after two years, what is the hold up with this?

[cmaglie]

Rebased and merged.
I've changed the method name from beginMulti to beginMulticast to be more Arduino-style, hope this won't be a big concern.

Thanks you and sorry for the long delay.

[ghost]

Cool! Thank you!