Grant Edwards:

I need to generate a broadcast UDP TFTP read request, and the usual
TFTP client tools I use (atftp, tftpy) can't do that. Does anybody
have a suggestion for an easy wat to generate such a request?

...

Tftp is specified by:
https://www.rfc-editor.org/rfc/rfc1350.txt

To send datagrams to the broadcast address, you need to
set SO_BROADCAST in setsockopt(), so unpatched the traditional
clients won't work. For details see:
man 7 socket
man setsockopt

Theese might help:
https://www.abc.se/~m6695/udp.html https://people.cs.rutgers.edu/~pxk/417/notes/sockets/udp.html https://users.cs.jmu.edu/bernstdh/web/common/lectures/summary_unix_udp.php

Regards,
/Karl Hammar

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