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This ensures the device can receive UDP broadcast packets, required for discovering devices correctly.
May appear unnecessary for some devices/other installed applications, but is needed for correctness (see https://stackoverflow.com/questions/30648334/is-change-wifi-multicast-state-permission-and-use-of-wifimanager-multicastlock-r or https://stackoverflow.com/questions/27838660/moto-g-dosent-receive-udp-packets-over-wifi-network)
Worked on my device, but it does not appear necessary for my device either. Hopefully it solves some problems for others.
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Disclaimer: Anything following might be wrong
As far as I understand there is a difference between broadcast and multicast (see http://www.utilizewindows.com/the-difference-between-unicast-multicast-and-broadcast-messages/). We are BROADcasting to discover devices (to 255.255.255.255 to be specific), so this might not change anything at all.
On the other hand, the second link indeed implies that this could solve some issues. It would be nice if we actually found somebody with a concrete issue.
I think you're right, although the naming makes it all a bit confusing. I guess we can look at it again if someone reports a bug about this.