You can actually use connect(2) for UDP. From the manual https://man7.org/linux/man-pages/man2/connect.2.html:

> If the socket sockfd is of type SOCK_DGRAM, then addr is the address to which datagrams are sent by default, and the only address from which datagrams are received.

After that, you can use send() instead of sendmsg(), so it saves you on having to pass the host on each call to sendmsg.

It can also avoid extra DNS lookups: everything is handled for you by the kernel. See also: https://stackoverflow.com/a/51296247