A UDP socket can be generated using (aleph.udp/socket {:port 10001, :broadcast? false}). If the :port is specified, it will yield a duplex socket which can be used to send and receive messages, which are structured as maps with the following data:

{:host "example.com"
 :port 10001
 :message ...}

Where incoming packets will have a :message that is a byte-array, which can be coerced using byte-streams, and outgoing packets can be any data which can be coerced to a binary representation. If no :port is specified, the socket can only be used to send messages.

To learn more, read the documentation.