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By spike7638
#63722 I don't have a solution to your main problem, but I do notice an error near the end.

Code: Select all  Udp.write(replyPacekt);
    Udp.endPacket();


should be
Code: Select all  Udp.write(replyPacket);
    Udp.endPacket();


[the spelling of "replyPacket" has been fixed]

As for the original problem, it's almost certainly a case of some missing library --- but someone more expert with the system than I am can help you with that, I'll bet.