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This is so trivial that it really doesn't matter - it's just sending a completely normal SSDP request, code for which you could find in any implementation of the protocol.

From the HN guidelines:

Please resist commenting about being downvoted. It never does any good, and it makes boring reading.

This SSDP problem is known for years.

You’re being down-voted because this is already well known, and has been used for years.