Ability to join a UDP socket to multicast group

[psk7]

Ktor Version

1.1.2

Ktor Engine Used(client or server and name)

ktor-network

JVM Version, Operating System and Relevant Context

openjdk 11.0.1, Windows, Linux

Feedback

We very lacks ability to join a UDP socket to multicast IPv6 group.

Please, consider adding this feature.

[Hesamedin]

I've recently assigned a task to implement Alarm Notification System which is based on UDP Multi cast. I decided to implement it based on Kotlin MP. So please:

1. Implement it a way that supports multi platform
2. In Mac OS, java lib returns IP6 instead of IP4. So, I have to add -Djava.net.preferIPv4Stack=true into JVM Param. It would be awesome to set a setting for that, too.

[agent10]

Include iOS/tvOS platform to the list would be great.

[oleg-larshin]

Please check the following ticket on YouTrack for follow-ups to this issue. GitHub issues will be closed in the coming weeks.