We are using arm angstrom linux system for the Cyclone V . What do we need to add in order to respose to a UDP Broadcast command?

Hello,

Since you are running linux on board, you can use some linux commands to control the ethernet stream. I would start with tcpdump. If you cannot find tcpdump command, you might need to install it:

opkg install tcpdump

More information about this command can be found here:

https://www.tcpdump.org/manpages/tcpdump.1.html

Hope this might help.

Thank you