Bug report

Bug description:

Trying to send multicast UDP packets with DatagramTransport.sendto, I notice no error on the python program but no packet is sent (I've checked with tcpdump). Modifying the call to use the underlying socket fixes the issue but I get a warning that I should not use this socket directly.
Is this a known issue?
How should I use asyncio to properly send UDP multicast packets?

CPython versions tested on:

3.10

Operating systems tested on:

Linux

Linked PRs

• gh-113812: Allow DatagramTransport.sendto to send empty data #115199