Thanks for your tutorials MAK3, i recently got a wiz820 :-). So it is good to have this info clearly presented.
About UDP : ping is essentially a protocol too : you send some data and when it is received by the host, it will send some data back.
But most servers have ports blocked or a stealth mode where they simply do not answer.
So my point is still that you can not know if a server is active, listening or whatever unless there is some protocol that uses UDP.
You should check the protocol for your equipment.
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